Precipitation on grain boundaries in Al-Mg-Si alloys: The role of grain boundary misorientation

被引：18
|
作者：
Zhang, Zhijun [1 ]
Parson, N. C. [2 ]
Poole, W. J. [1 ]
机构：
[1] Univ British Columbia, Dept Mat Engn, 309-6350 Stores Rd, Vancouver, BC V6T 1Z4, Canada
[2] Rio Tinto Aluminium, Saguenay, PQ, Canada
来源：
SCRIPTA MATERIALIA | 2022年 / 211卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Al-Mg-Si alloys; Precipitation; Grain boundaries; Cooling rate; ALUMINUM; SEGREGATION; NUCLEATION;
D O I：
10.1016/j.scriptamat.2021.114494
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The application of Al-Mg-Si alloys is growing in fracture critical applications such as transportation. The formation of grain boundary precipitates during cooling after solution treatment is an important factor in controlling low energy intergranular fracture modes. A systematic study was conducted on the effects of grain boundary misorientation and cooling rate (between 3 and 1000 degrees C/s) on the size and density of grain boundary precipitates before and after artificial ageing. It was found that precipitates on high angle grain boundaries were approximate to 3 times larger than those formed on low angle boundaries. The grain boundary precipitate size decreased by a factor of 3 when the cooling rate increased from 3 to 80 degrees C/s with no precipitates observed at 1000 degrees C/s. However, even for a cooling rate of 1000 degrees C/s, grain boundary precipitation was observed during subsequent artificial ageing. The effects of grain boundary misorientation and cooling rate were rationalized by enhanced diffusion at grain boundaries. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：6
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