Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting

Li, Longfei1,2,3; Ji, Shouxun4; Zhu, Qiang5; Wang, Yun4; Dong, Xixi4; Yang, Wenchao6; Midson, Stephen7,8; Kang, Yonglin9

2018-08

10.1007/s11661-018-4684-2

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   影响因子和分区

1073-5623

1543-1940

The microstructure and mechanical properties of Al-8.1Mg-2.6Si-(0.08 to 4.62)Zn alloys (in wt pct) have been investigated by the permanent mold casting process. X-ray diffraction analysis shows that the tau-Mg-32(Al, Zn)(49) phase forms when the Zn content is 1.01 wt pct. With higher Zn contents of 2.37 and 3.59 wt pct, the eta-MgZn2 and tau-Mg-32(Al, Zn)(49) phases precipitate in the microstructure, and the eta-MgZn2 phase forms when the Zn content is 4.62 wt pct. Metallurgical analysis shows that the eta-MgZn2 and tau-Mg-32(Al, Zn)(49) phases strengthen the Al-8.1Mg-2.6Si-(0.08 to 4.62)Zn alloys. After solutionizing at 510 A degrees C for 180 minutes and aging at 180 A degrees C for 90 minutes, the eta'-MgZn2 phase precipitates in the alpha-Al matrix, which significantly enhances the mechanical properties. Addition of 3.59 wt pct Zn to the Al-8.1Mg-2.6Si alloy with heat treatment increases the yield strength from 96 to 280 MPa, increases the ultimate tensile strength from 267 to 310 MPa, and decreases the elongation from 9.97 to 1.74 pct.

SCI ; EI

英语

通讯

Natural Science Basic Research Plan of Shaanxi Province, China[2016JQ5093]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000436905100013

SPRINGER

20182405306397

Die casting ; Magnesium alloys ; Mechanical properties ; Microstructure ; Precipitates ; Silicon alloys ; Tensile strength ; X ray powder diffraction ; Zinc alloys

Foundry Practice:534.2 ; Aluminum Alloys:541.2 ; Zinc and Alloys:546.3 ; Alkaline Earth Metals:549.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Brunel Univ London, Inst Mat & Mfg, BCAST, Uxbridge UB8 3PH, Middx, England
2.Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China
3.Univ Sci & Technol Beijing, Beijing 100083, Peoples R China
4.Inst Mat & Mfg, BCAST, Uxbridge, Middx, England
5.Southern Univ Sci & Technol, Shenzhen 518055, Peoples R China
6.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
7.Gen Res Inst Nonferrous Met, Golden, CO 80401 USA
8.Colorado Sch Mines, Golden, CO 80401 USA
9.Univ Sci & Technol Beijing, Beijing, Peoples R China

Li, Longfei,Ji, Shouxun,Zhu, Qiang,et al. Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2018,49A(8):3247-3256.

Li, Longfei.,Ji, Shouxun.,Zhu, Qiang.,Wang, Yun.,Dong, Xixi.,...&Kang, Yonglin.(2018).Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,49A(8),3247-3256.

Li, Longfei,et al."Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 49A.8(2018):3247-3256.