Characterization of the Aging Precipitates of Al-12Si-4Cu-2Ni-0.8Mg-0.2Gd Piston Alloy

被引：18
作者：
Sui, Yudong [1 ,2 ]
Ji, Depeng [1 ]
Han, Lina [1 ]
Wang, Qudong [2 ]
机构：
[1] Kunming Univ Sci & Technol, Sch Mat Sci & Engn, 253 Xuefu Rd, Kunming 650093, Yunnan, Peoples R China
[2] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloys Net Forming, 800,Dongchuan Rd, Shanghai 200240, Peoples R China
来源：
JOM | 2019年 / 71卷 / 01期
基金：
中国博士后科学基金;
关键词：
MECHANICAL-PROPERTIES; MG; MICROSTRUCTURE; ZR; ADDITIONS; STRENGTH; GD;
D O I：
10.1007/s11837-018-3080-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The aging precipitates of cast-T6 Al-12Si-4Cu-2Ni-0.8Mg-0.2Gd piston alloy were investigated. Microstructure observations indicate that the thermally unstable -Al2Cu precipitates disappeared inside the grains and the thermally stable Al3CuGd precipitates were formed at the grain boundary. The Al3CuGd precipitates were formed more easily than Al2Cu phases according to the ab initio calculations. Owing to the combined strengthening effect of precipitates, the Al-Si-Cu-Ni-Mg-Gd alloy has a higher tensile strength than the Al-Si-Cu-Ni-Mg alloy. The disappearance of the unstable -Al2Cu precipitates and the formation of Al3CuGd at the grain boundary facilitate the increase in the elevated-temperature strength of the Al-Si-Cu-Ni-Mg-Gd alloy.
引用
收藏
页码：366 / 372
页数：7
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