# US 12,110,575 B2 · High strength and toughness die-casting aluminum alloy without heat treatment, preparation method and article thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,110,575 B2 - Document ID: US12110575B2 - Status: Granted - Kind: B2 - Application number: 18/233,911 - Filed: 2023-08-15 - Published: 2024-09-12 - Granted: 2024-10-08 - Earliest claimed: 2023-03-09 - Assignees: Guangdong Hongtu Auto Parts Co., Ltd; Guangdong Hongtu Technology (Holdings) Co., Ltd - Applicants: Guangdong Hongtu Auto Parts Co., Ltd; Guangdong Hongtu Technology (Holdings) Co., Ltd - Inventors: Hua Huang; Yu Zhu; Feng Yan; Yun Lin; Li Wan - Web page: https://patentgrep.com/patent/US12110575B2 ## CPC - C22C 21/02: with silicon as the next major constituent - B22D 17/00: Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure - B22D 21/007: {with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C} - C22C 1/026: {Alloys based on aluminium} - C22C 1/03: using master alloys - C22C 1/06: with the use of special agents for refining or deoxidising - C22C 21/04: Modified aluminium-silicon alloys - Y02P 10/20: Recycling - C22C: ALLOYS (treatment of alloys C21D, C22F) - B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22) - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A high strength and toughness die-casting aluminum alloy without heat treatment, a preparation method and an article thereof are provided. Aluminum alloy includes the following components in percentage by mass: 7.0-10.0 wt. % of silicon, not more than 0.05 wt. % of copper, not more than 0.4 wt. % of magnesium, 0.3-0.7 wt. % of manganese, not more than 0.2 wt. % of iron, not more than 0.07 wt. % of zinc, not more than 0.2 wt. % of titanium, 0.015-0.03 wt. % of strontium, 0.01-0.1 wt. % of vanadium, 0.01-0.1 wt. % of zirconium, and other unavoidable impurity elements, each not more than 0.05 wt. %. The total amount of other unavoidable impurity elements is not more than 0.25 wt. %, and the rest is aluminum. ## Claims ### Claim 1 A die-casting aluminum alloy having copper and zinc elements without a heat treatment, comprising the following components in percentage by mass: 7.0 wt. %-10.0 wt. % of silicon, no more than 0.05 wt. % of copper, no more than 0.006 wt. % of magnesium, 0.3 wt. %-0.7 wt. % of manganese, 0.1 wt. %-0.2 wt. % of iron, no more than 0.07 wt. % of zinc, 0.03 wt. %-0.2 wt. % of titanium, 0.015 wt. %-0.03 wt. % of strontium, 0.02 wt. %-0.05 wt. % of vanadium, 0.01 wt. %-0.05 wt. % of zirconium, no more than 0.05 wt. % of each of unavoidable impurity elements; wherein a sum of the unavoidable impurity elements is no more than 0.25 wt. %, and a rest is aluminum; and a ratio of the percentage by mass of the vanadium to the percentage by mass of the zirconium is 1.2:1 to 2.4:1, wherein an as-cast tensile strength of the die-casting aluminum alloy is in a range between 270 MPa and 300 MPa, an as-cast yield strength of the die-casting aluminum alloy is in a range between 120 MPa and 150 MPa, and an as-cast elongation of the die-casting aluminum alloy is in a range between 11% and 16%. ### Claim 2 (depends on 1) The die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 1, wherein the die-casting aluminum alloy comprises the following components in the percentage by mass: 8.5 wt. %-9.5 wt. % of the silicon, no more than 0.05 wt. % of the copper, no more than 0.006 wt. % of the magnesium, 0.45 wt. %-0.55 wt. % of the manganese, 0.1 wt. %-0.2 wt. % of the iron, no more than 0.07 wt. % of the zinc, 0.03 wt. %-0.2 wt. % of the titanium, 0.015 wt. %-0.03 wt. % of the strontium, 0.02 wt. %-0.05 wt. % of the vanadium, and 0.01 wt. %-0.05 wt. % of the zirconium; each of the unavoidable impurity elements is no more than 0.05 wt. %, the sum of the unavoidable impurity elements is no more than 0.25 wt. %, and the rest is the aluminum. ### Claim 3 (depends on 1) A method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 1, comprising the following steps: S1) weighing an aluminum raw material, a silicon raw material, a magnesium raw material, an Al—Mn intermediate alloy, an Al—V intermediate alloy, an Al-Zr intermediate alloy, an Al—Sr intermediate alloy, and an Al—Ti—B intermediate alloy according to a weight ratio; S2) adding weighed metal raw materials in batches to a smelting furnace for melting to obtain a molten aluminum liquid; S3) after the weighed metal raw materials in the molten aluminum liquid have melted, allowing the molten aluminum liquid to stand still and analyzing whether a chemical composition of the molten aluminum liquid meets a requirement; if so, proceeding to step S5; if not, proceeding to step S4; S4) determining a composition adjustment plan and materials based on an analysis of the chemical composition, and then proceeding to step S2; S5) conducting a preliminary refinement of the molten aluminum liquid and injecting a preliminarily refined molten aluminum liquid into a transfer ladle; S6) conducting a secondary refinement of the preliminarily refined molten aluminum liquid in the transfer ladle, and adding the Al—Ti—B intermediate alloy in a powder state to obtain a refined aluminum liquid; S7) conducting a quality testing on the refined aluminum liquid to determine whether the refined aluminum liquid meets a quality requirement; if so, proceeding to step S9; if not, proceeding to step S8; S8) determining a quality adjustment plan and materials based on the quality testing, and then proceeding to step S2; S9) injecting the refined aluminum liquid into a die-casting machine for a die-casting to obtain a die-casting aluminum alloy article without the heat treatment and a primary return charge. ### Claim 4 (depends on 3) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 3, wherein S2 comprises the following steps: S21) adding the aluminum raw material to the smelting furnace, then raising a temperature in the smelting furnace to 680° C., and maintaining the temperature in the smelting furnace until the aluminum raw material is melted; S22) raising the temperature in the smelting furnace to 720° C.-750° C., then adding the silicon raw material, the Al—Mn intermediate alloy, the Al—V intermediate alloy, the Al—Zr intermediate alloy, and the Al—Sr intermediate alloy, and maintaining the temperature in the smelting furnace until the Al—Mn intermediate alloy, the Al—V intermediate alloy, the Al—Zr intermediate alloy, the Al—Sr intermediate alloy, and the silicon raw material are melted to obtain a melt; S23) reducing the temperature in the smelting furnace to 700° C.-730° C., then pressing the magnesium raw material into the melt and maintaining the temperature in the smelting furnace until the magnesium raw material is completely melted. ### Claim 5 (depends on 3) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 3, wherein the aluminum raw material is one or more of pure aluminum or aluminum ingots with a quality not lower than Al99.80 grade for remelting, and/or the silicon raw material is one or more of pure silicon or industrial silicon with a quality not lower than Si4410 grade. ### Claim 6 (depends on 3) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 3, wherein in S2, the primary return charge not exceeding 30% of a total aluminum demand weight is added. ### Claim 7 (depends on 3) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 3, wherein in S9, the refined aluminum liquid in the transfer ladle is transferred to a holding furnace located on a side of the die-casting machine for an insulation. ### Claim 8 (depends on 1) A die-casting aluminum alloy article having copper and zinc elements without a heat treatment, wherein the die-casting aluminum alloy article comprises the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 1; or at least a portion of the-die-casting aluminum alloy article is obtained by reprocessing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 1. ### Claim 9 (depends on 3) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 3, wherein the die-casting aluminum alloy comprises the following components in the percentage by mass: 8.5 wt. %-9.5 wt. % of the silicon, no more than 0.05 wt. % of the copper, 0.2 wt. %-0.3 wt. % of the magnesium, 0.45 wt. %-0.55 wt. % of the manganese, 0.1 wt. %-0.2 wt. % of the iron, no more than 0.07 wt. % of the zinc, 0.03 wt. %-0.2 wt. % of the titanium, 0.015 wt. %-0.03 wt. % of the strontium, 0.02 wt. %-0.05 wt. % of the vanadium, and 0.01 wt. %-0.05 wt. % of the zirconium; each of the unavoidable impurity elements is no more than 0.05 wt. %, the sum of the unavoidable impurity elements is no more than 0.25 wt. %, and the rest is the aluminum. ### Claim 10 (depends on 4) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 4, wherein in S2, the primary return charge not exceeding 30% of a total aluminum demand weight is added. ### Claim 11 (depends on 5) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 5, wherein in S2, the primary return charge not exceeding 30% of a total aluminum demand weight is added. ### Claim 12 (depends on 4) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 4, wherein in S9, the refined aluminum liquid in the transfer ladle is transferred to a holding furnace located on a side of the die-casting machine for an insulation. ### Claim 13 (depends on 5) The method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 5, wherein in S9, the refined aluminum liquid in the transfer ladle is transferred to a holding furnace located on a side of the die-casting machine for an insulation. ### Claim 14 (depends on 8) The die-casting aluminum alloy article having the copper and zinc elements without the heat treatment according to claim 8, wherein the die-casting aluminum alloy comprises the following components in the percentage by mass: 8.5 wt. %-9.5 wt. % of the silicon, no more than 0.05 wt. % of the copper, no more than 0.006 wt. % of the magnesium, 0.45 wt. %-0.55 wt. % of the manganese, 0.1 wt. %-0.2 wt. % of the iron, no more than 0.07 wt. % of the zinc, 0.03 wt. %-0.2 wt. % of the titanium, 0.015 wt. %-0.03 wt. % of the strontium, 0.02 wt. %-0.05 wt. % of the vanadium, and 0.01 wt. %-0.05 wt. % of the zirconium; each of the unavoidable impurity elements is no more than 0.05 wt. %, the sum of the unavoidable impurity elements is no more than 0.25 wt. %, and the rest is the aluminum. ### Claim 15 (depends on 3) A die-casting aluminum alloy article having copper and zinc elements without a heat treatment, comprising die-casting aluminum alloy having copper and zinc elements without a heat treatment prepared by the method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 3; or at least a portion of the die-casting aluminum alloy article is obtained by reprocessing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment prepared by the method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment according to claim 3. ### Claim 16 (depends on 15) The die-casting aluminum alloy article having the copper and zinc elements without the heat treatment according to claim 15, wherein S2 of the method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment comprises the following steps: S21) adding the aluminum raw material to the smelting furnace, then raising a temperature in the smelting furnace to 680° C., and maintaining the temperature in the smelting furnace until the aluminum raw material is melted; S22) raising the temperature in the smelting furnace to 720° C.-750° C., then adding the silicon raw material, the Al—Mn intermediate alloy, the Al—V intermediate alloy, the Al—Zr intermediate alloy, and the Al—Sr intermediate alloy, and maintaining the temperature in the smelting furnace until the Al—Mn intermediate alloy, the Al—V intermediate alloy, the Al—Zr intermediate alloy, the Al—Sr intermediate alloy, and the silicon raw material are melted to obtain a melt; S23) reducing the temperature in the smelting furnace to 700° C.-730° C., then pressing the magnesium raw material into the melt and maintaining the temperature in the smelting furnace until the magnesium raw material is completely melted. ### Claim 17 (depends on 15) The die-casting aluminum alloy article having the copper and zinc elements without the heat treatment according to claim 15, wherein in the method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment, the aluminum raw material is one or more of pure aluminum or aluminum ingots with a quality not lower than Al99.80 grade for remelting, and/or the silicon raw material is one or more of pure silicon or industrial silicon with a quality not lower than Si4410 grade. ### Claim 18 (depends on 15) The die-casting aluminum alloy article having the copper and zinc elements without the heat treatment according to claim 15, wherein in S2 of the method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment, the primary return charge not exceeding 30% of a total aluminum demand weight is added. ### Claim 19 (depends on 15) The die-casting aluminum alloy article having the copper and zinc elements without the heat treatment according to claim 15, wherein in S9 of the method for preparing the die-casting aluminum alloy having the copper and zinc elements without the heat treatment, the refined aluminum liquid in the transfer ladle is transferred to a holding furnace located on a side of the die-casting machine for an insulation. ### Claim 20 A die-casting aluminum alloy having copper and zinc elements without a heat treatment comprising the following components in the percentage by mass: 9.0 wt. % of silicon, 0.05 wt. % of copper, 0.006 wt. % of magnesium, 0.5 wt. % of manganese, 0.1 wt. % of iron, 0.07 wt. % of zinc, 0.03 wt. % of titanium, 0.022 wt. % of strontium, 0.024 wt. % of vanadium, 0.014 wt. % of zirconium, no more than 0.05 wt. % of each of unavoidable impurity elements; wherein a sum of the unavoidable impurity elements is no more than 0.25 wt. %, and a rest is aluminum; and a ratio of the percentage by mass of the vanadium to the percentage by mass of the zirconium is 1.7:1, wherein an as-cast tensile strength of the die-casting aluminum alloy is in a range between 270 MPa and 300 MPa, an as-cast yield strength of the die-casting aluminum alloy is in a range between 120 MPa and 150 MPa, and an as-cast elongation of the die-casting aluminum alloy is in a range between 11% and 16%.