Effect of solution treatment on microstructure and mechanical properties of as-cast Al-12Si-4Cu-2Ni-0.8Mg-0.2Gd alloy

被引：2

作者：

Sui, Yu-dong ^{[1
,2
,3
]}

Jiang, Ye-hua ^{[1
]}

Wang, Qu-dong ^{[2
,3
]}

机构：

[1] Kunming Univ Sci & Technol, Sch Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China

[2] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloys Net Forming, Shanghai 200240, Peoples R China

[3] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China

来源：

CHINA FOUNDRY | 2022年 / 19卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Al-Si-Cu-Ni-Mg alloy; Gd element; solution treatment; microstructure; mechanical properties; TG146; 21; A; HEAT-TREATMENT; TENSILE PROPERTIES; ALUMINUM; IMPROVEMENT; EVOLUTION; SILICON;

D O I：

10.1007/s41230-022-1076-4

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Effect of solution treatment on microstructure and mechanical properties of Al-12Si-4Cu-2Ni-0.8Mg-0.2Gd alloy was investigated. Results show the Si particles become stable and more intermetallic compounds dissolve in the matrix after solution treatment at 500 degrees C for 2 h followed by 540 degrees C for 3 h (T4). The skeleton-like Al3CuNi develops into two parts in the T4 alloy: one is Al3CuNi which has the framework shape; the other is intermetallics including the Al3CuNi (size: 5-10 mu m) and AlSiCuNiGd phases (size: <= 5 mu m) with complex structure. Adding 0.2% Gd can improve the mechanical properties of the alloys after two-step solution treatment (500 degrees C/2 h followed by 540 degrees C/3 h), the hardness of the alloy increases from 130.9 HV to 135.8 HV compared with the alloy with one-step solution treatment (500 degrees C/2 h), the engineering strength increases from 335.45 MPa to 352.03 MPa and the fracture engineering strain increases from 1.44% to 1.67%.

引用

页码：238 / 244

页数：7

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