# US 9,518,312 B2 · Al—Mg—Si-based, casting aluminum alloy with excellent yield strength and cast member made thereof

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- Number: US 9,518,312 B2
- Document ID: US9518312B2
- Status: Granted
- Kind: B2
- Application number: 13/260,468
- Filed: 2010-03-31
- Published: 2012-02-09
- Granted: 2016-12-13
- Earliest claimed: 2009-03-31
- Assignees: Hitachi Metals, Ltd.
- Applicants: Hideki Yamaura; Hidetsuna Watanabe
- Inventors: Hideki Yamaura; Hidetsuna Watanabe
- Web page: https://patentgrep.com/patent/US9518312B2

## CPC

- C22C 21/08: with silicon
- C22C 21/02: with silicon as the next major constituent
- C22C 21/06: with magnesium as the next major constituent
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A Al—Mg—Si-based, casting aluminum alloy comprising by mass 4-6% of Mg, 3.1-4.5% of Si, 0.5-1% of Mn, 0.1-0.3% of Cr, and 0.1-0.4% of Cu, the balance being Al and inevitable impurities.

## Claims

### Claim 1

A cast member made of an Al—Mg—Si-based, casting aluminum alloy having large elongation and high yield strength comprising by mass, 4-6% of Mg, 3.1-4.5% of Si, 0.5-1% of Mn, 0.1-0.3% of Cr, and 0.1-0.4% of Cu, the balance being Al and inevitable impurities, wherein the total amount of Cr and Cu is 0.2-0.7%, and wherein said elongation and said yield strength are respectively 3% or more and 220 MPa or more in an as-cast state.

### Claim 2 (depends on 1)

The cast member made of the Al—Mg—Si-based, casting aluminum alloy according to claim 1, further comprising 0.05-0.3% by mass of Ti.

### Claim 3 (depends on 1)

The cast member made of an Al—Mg—Si-based, casting aluminum alloy according to claim 1, wherein the Mn content is 0.7-1.0% by mass.

### Claim 4 (depends on 1)

The cast member made of an Al—Mg—Si-based, casting aluminum alloy according to claim 1, wherein said cast member is not subjected to a heat treatment.

### Claim 5

A cast member made of an Al—Mg—Si-based, casting aluminum alloy having large elongation and high yield strength consisting of by mass, 4-6% of Mg, 3.1-4.5% of Si, 0.5-1% of Mn, 0.1-0.3% of Cr, and 0.1-0.4% of Cu, the balance being Al and inevitable impurities, wherein the total amount of Cr and Cu is 0.2-0.7%, and wherein said elongation and said yield strength are respectively 3% or more and 220 MPa or more in an as-cast state.

### Claim 6 (depends on 5)

The cast member made of an Al—Mg—Si-based, casting aluminum alloy according to claim 5, wherein the Mn content is 0.7-1.0% by mass.

### Claim 7 (depends on 5)

The cast member made of an Al—Mg—Si-based, casting aluminum alloy according to claim 5, wherein said cast member is not subjected to a heat treatment.

### Claim 8

A cast member made of an Al—Mg—Si-based casting aluminum alloy having large elongation and high yield strength consisting of by mass, 4-6% of Mg, 3.1-4 5% of Si, 0.5-1% of Mn, 0.1-0.3% of Cr, 0.1-0.4% of Cu, and 0.05-0.3% of Ti, the balance being Al and inevitable impurities, wherein the total amount of Cr and Cu is 0.2-0.7%, and wherein said elongation and said yield strength are respectively 3% or more and 220 MPa or more in an as-cast state.

### Claim 9 (depends on 8)

The cast member made of an Al—Mg—Si-based, casting aluminum alloy according to claim 8, wherein the Mn content is 0.7-1.0% by mass.

### Claim 10 (depends on 8)

The cast member made of an Al—Mg—Si-based, casting aluminum alloy according to claim 8, wherein said cast member is not subjected to a heat treatment.