On the strengthening effect of Al-Cr-Si dispersoid in an Al-Si-Mg-Cu casting alloy with Cr addition

被引：35
作者：
An, Zhiheng [1 ,2 ]
Yang, Wenhui [3 ]
Zhan, Hongyi [1 ]
Hu, Bin [1 ]
Wang, Qigui [4 ]
Matsumura, Syo [3 ,5 ]
Sha, Gang [2 ]
机构：
[1] Gen Motors Global Res & Dev, China Sci Lab, 56 Jinwan Rd, Shanghai, Peoples R China
[2] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Herbert Gleiter Inst Nanosci, Nanjing, Jiangsu, Peoples R China
[3] Kyushu Univ, Dept Appl Quantum Phys & Nucl Engn, Nishi Ku, Fukuoka, Fukuoka, Japan
[4] Gen Motors Global Prod Grp, Pontiac, MI USA
[5] Kyushu Univ, Ultramicroscopy Res Ctr, Nishi Ku, Fukuoka, Fukuoka, Japan
来源：
MATERIALS CHARACTERIZATION | 2020年 / 166卷
关键词：
Dispersoid; Al-Si casting alloys; HAADF-STEM; Orowan looping mechanism; Thermal stability; Edge-to-edge model; HIGH-TEMPERATURE STRENGTH; CRYSTAL-STRUCTURE; MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; TRANSITION-ELEMENTS; GRAIN-REFINEMENT; MICRO-ADDITIONS; Q-PRECIPITATE; MICROSTRUCTURE; PHASE;
D O I：
10.1016/j.matchar.2020.110457
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present study, chromium (Cr) was added to an Al-Si-Mg-Cu casting alloy to investigate the strengthening effect of face-centered cubic structured Al-Cr-Si dispersoid precipitated in the intra-dendritic region. The Al-Si-Mg-Cu alloy with Cr addition shows a stronger hardening response to solution treatment than the Al-Si-Mg-Cu alloy without Cr addition, which was ascribed to the precipitation of Al-Cr-Si dispersoid occurred during solution treatment. Detailed characterization on Al-Cr-Si dispersoid via scanning transmission electron microscopy (STEM) indicates that there is a preferential orientation relationship between Al-Cr-Si dispersoid and Al matrix. This is in a good agreement with the prediction by the edge-to-edge model. In addition, the present study unveils a contradiction between the castability of Al-Si-Mg-Cu-Cr alloy and strengthening effect of Al-Cr-Si dispersoid. This contradiction was discussed based on thermodynamic calculations. Tensile properties of the Cr-free and Cr-containing Al-Si-Mg-Cu alloys after ageing treatment have been characterized. Unfortunately, strengthening effect of Al-Cr-Si dispersoid was not retained in the Cr-containing alloy after ageing treatment, owing to the strong interaction between Al-Cr-Si dispersoid and age strengthening elements during quenching. Quench-induced particles were extensively nucleated on the dispersoid, which may result from the synergic effects of dispersoid/matrix interphase energy and Si enrichment in the dispersoid. The undesirable quench-induced particles attached to Al-Cr-Si dispersoid consumed age strengthening elements in the Al matrix and undermined the thermal stability of Al-Cr-Si dispersoid.
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页数：13
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