# US 11,299,797 B2 · Copper-containing, high-toughness and rapidly degradable magnesium alloy, preparation method therefor and use thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,299,797 B2 - Document ID: US11299797B2 - Status: Granted - Kind: B2 - Application number: 17/052,816 - Filed: 2019-07-01 - Published: 2021-09-02 - Granted: 2022-04-12 - Earliest claimed: 2018-10-23 - Assignees: Chongqing University - Applicants: Chongqing University - Inventors: Jingfeng Wang; Shiqing Gao; Shijie Liu; Kui Wang; Fusheng Pan - Web page: https://patentgrep.com/patent/US11299797B2 ## CPC - C22C 23/06: with a rare earth metal as the next major constituent - C22C 1/02: by melting {(C22C1/1036 takes precedence)} - C22C 23/00: Alloys based on magnesium - C22F 1/06: of magnesium or alloys based thereon - C22C: ALLOYS (treatment of alloys C21D, C22F) - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) ## Abstract Provided are a copper-containing, high-toughness and rapidly degradable magnesium alloy, a preparation method therefor and the use thereof, wherein same relate to the field of materials for oil and gas exploitation. When the magnesium alloy is in an as-cast state, an extrusion state or an aging state, a strengthening phase thereof mainly includes an Mg12CuRE-type long-period phase and an Mg5RE phase and an Mg2Cu phase, the Mg12CuRE-type long-period phase has a volume fraction of 3-60%, the Mg5RE phase has a volume fraction of 0.5-20%, and the Mg2Cu phase has a volume fraction of 0.5-15%, wherein RE is a rare-earth metal element. ## Claims ### Claim 1 A copper-containing degradable magnesium alloy, wherein a strengthening phase of the magnesium alloy comprises an Mg12CuRE long-period stacking ordered phase, an Mg5RE phase and an Mg2Cu phase, wherein the Mg12CuRE long-period stacking ordered phase has a volume fraction of 3%˜60%, the Mg5RE phase has a volume fraction of 0.5%˜20%, and the Mg2Cu phase has a volume fraction of 0.5%-15%, wherein RE is a rare-earth metal element. ### Claim 2 (depends on 1) The copper-containing degradable magnesium alloy according to claim 1, wherein the magnesium alloy comprises as-cast magnesium alloy, as-extruded magnesium alloy and aged magnesium alloy. ### Claim 3 (depends on 1) The copper-containing degradable magnesium alloy according to claim 1, wherein the volume fraction of the Mg12CuRE long-period stacking ordered phase is 3%, 4.0%, 4.5%, 5.0%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 34%, 36%, 38%, 42%, 46%, 50%, 55%, 58% or 60%; the volume fraction of the Mg5RE phase is 0.5%, 1%, 2%, 5%, 7%, 10%, 12%, 15%, 18% or 20%; the volume fraction of the Mg2Cu phase is 0.5%, 1%, 2%, 3%, 5%, 6%, 8%, 9%, 10%, 12% or 15%. ### Claim 4 (depends on 1) The copper-containing degradable magnesium alloy according to claim 1, wherein RE is Gd, Y, Er, a combination of Gd and Y, a combination of Gd and Er, a combination of Y and Er, or a combination of Gd, Y and Er. ### Claim 5 (depends on 2) The copper-containing degradable magnesium alloy according to claim 2, wherein the MgxREy is Mg7RE, Mg5RE, Mg12RE or Mg24RE5; and the volume fraction of the MgxREy phase is 3%, 5%, 7%, 10%, 12%, 15%, 18%, 20% or 22%. ### Claim 6 (depends on 1) The copper-containing degradable magnesium alloy according to claim 1, wherein the magnesium alloy comprises a following elemental composition in percentage by weight: Cu 1.0%˜10%, and RE 1.0%˜30%, and a balance comprises Mg and unavoidable impurities. ### Claim 7 (depends on 1) The copper-containing degradable magnesium alloy according to claim 1, wherein the magnesium alloy comprises a following elemental composition in percentage by weight: Cu 1%˜9%, and RE 1%˜25%, and a balance comprises Mg and unavoidable impurities. ### Claim 8 (depends on 1) The copper-containing degradable magnesium alloy according to claim 1, wherein the magnesium alloy comprises a following elemental composition in percentage by weight: Cu 2%˜8%, and RE 2.5%˜22%, and a balance comprises Mg and unavoidable impurities. ### Claim 9 (depends on 1) The copper-containing degradable magnesium alloy according to claim 1, wherein the magnesium alloy comprises a following elemental composition in percentage by weight: Cu 1%˜6.5%, RE 1%˜28%, and M 0.1%˜9%, and a balance comprises Mg and unavoidable impurities, wherein the M is an element that is able to be alloyed with magnesium. ### Claim 10 (depends on 1) The copper-containing degradable magnesium alloy according to claim 1, wherein the magnesium alloy comprises a following elemental composition in percentage by weight: Cu 2.0%˜6.0%, RE 2.0%˜22%, and M 0.1%˜8.5%, and a balance comprises Mg and unavoidable impurities, wherein the M is an element that is able to be alloyed with magnesium. ### Claim 11 (depends on 6) The copper-containing degradable magnesium alloy according to claim 6, wherein the M is any one of Zn, Mn, Zr, V, Hf, Nb, Mo, Ti, Ca, Fe and Ni, or a combination of at least two therefrom. ### Claim 12 (depends on 1) A method for preparing the copper-containing degradable magnesium alloy according to claim 1, wherein raw materials are selected according to a final phase composition of the magnesium alloy, to prepare the magnesium alloy. ### Claim 13 (depends on 2, 12) The method according to claim 12, wherein the raw materials are selected according to an elemental composition ratio of the magnesium alloy according to claim 2, and the magnesium alloy is prepared using an alloy preparation process. ### Claim 14 (depends on 12) The method according to claim 12, wherein the alloy preparation process comprises a smelting and casting method or a powder metallurgic method. ### Claim 15 (depends on 14) The method according to claim 14, wherein a smelting process comprises: melting the raw materials at 690˜780° C., wherein an inert gas is adopted for protection during a melting process; cooling melted raw materials to 630˜700° C. after the raw materials are sufficiently melted; and standing for 20˜90 min to complete the smelting; or a magnesium alloy ingot is obtained by casting after the raw materials are smelted, and the magnesium alloy ingot is successively subjected to homogenization treatment and extrusion deformation, and then subjected to spherized molding treatment; or a magnesium alloy ingot is obtained by casting after the raw materials are smelted, and the magnesium alloy ingot is successively subjected to homogenization treatment, extrusion deformation and aging heat treatment, and then subjected to spherized molding treatment; or the magnesium alloy ingot is successively subjected to homogenization treatment, extrusion deformation and spherized molding treatment, and then subjected to aging heat treatment; wherein the homogenization treatment is performed in a process condition of: being kept at 350° C.˜480° C. for 10 h˜36 h; the extrusion deformation is performed in a process condition of temperature of 350° C.˜470° C. and an extrusion ratio of 10˜40; and the aging heat treatment is performed in a condition of: being kept at 150° C.˜250° C. for 20 h˜60 h. ### Claim 16 (depends on 2) The copper-containing degradable magnesium alloy according to claim 2, wherein a strengthening phase of the as-cast magnesium alloy comprises an Mg12CuRE long-period stacking ordered phase, an Mg5RE phase and an Mg2Cu phase, wherein the Mg12CuRE long-period stacking ordered phase has a volume fraction of 3%˜55%, the Mg5RE phase has a volume fraction of 0.5%˜15%, and the Mg2Cu phase has a volume fraction of 0.5%˜8%. ### Claim 17 (depends on 2) The copper-containing degradable magnesium alloy according to claim 2, wherein a strengthening phase of the as-extruded magnesium alloy comprises an Mg12CuRE long-period stacking ordered phase, an Mg5RE phase and an Mg2Cu phase, wherein the Mg12CuRE long-period stacking ordered phase has a volume fraction of 4%˜60%, the Mg5RE phase has a volume fraction of 2%˜20%, and the Mg2Cu phase has a volume fraction of 1%˜10%. ### Claim 18 (depends on 2) The copper-containing, high strength and high toughness, rapidly degradable magnesium alloy according to claim 2, wherein a strengthening phase of the aged magnesium alloy comprises an Mg12CuRE long-period stacking ordered phase, an Mg2Cu phase and an MgxREy phase, wherein the Mg12CuRE long-period stacking ordered phase has a volume fraction of 4%˜60%, the Mg2Cu phase has a volume fraction of 2%˜15%, and the MgxREy phase has a volume fraction of 3%˜22%, wherein a value range of x:y is 3:1-12:1. ### Claim 19 (depends on 2) The copper-containing degradable magnesium alloy according to claim 2, wherein RE is one of Gd, Y and Er, or a combination of at least two therefrom. ### Claim 20 (depends on 6) The copper-containing degradable magnesium alloy according to claim 6, wherein the magnesium alloy comprises the following elemental composition in percentage by weight: Cu 1.0%˜10%, RE 1.0%˜30%, and M 0.03%˜10%, and the balance comprises Mg and unavoidable impurities, wherein the M is an element that is able to be alloyed with magnesium.