Controlling Σ3n Grain Boundary Distribution in GH3625 Alloy

被引：0
|
作者：
Gao Y. [1 ]
Ding Y. [1 ]
Chen J. [1 ]
Xu J. [1 ]
Ma Y. [1 ]
Wang X. [1 ]
机构：
[1] State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2020年 / 44卷 / 07期
关键词：
Annealing twin; Deformation twin; GH3625; alloy; Grain boundary character; Low ΣCSL grain boundary;
D O I：
10.13373/j.cnki.cjrm.XY18120011
中图分类号：
学科分类号：
摘要：
The grain boundary types of GH3625 alloy after cold deformation and annealing treatment were studied by electron backscatter diffraction (EBSD) and orientation imaging microscopy (OIM). And the mechanism of grain boundary distribution based on Σ3n (n=1, 2, 3) grain boundary was discussed. The results showed that the proportion of deformation twin boundary and low tantalum coincidence site lattice (CSL) grain boundary in GH3625 alloy increased gradually with the increase of cold deformation, but its proportion accounted for less than 5% of the whole grain boundary, which was not enough to control the alloy grain boundary character distribution, during cold deformation process. During the annealing process, the proportion of low ΣCSL grain boundary in GH3625 alloy decreased with the increase of cold deformation before annealing. When the cold deformation was 35% (the compression strain), annealing at 1100 °C for 10 min could make the proportion of low ΣCSL (coincidence site lattice, 1<Σ≤29) grain boundary to be more than 51.27%, in which Σ3n grain boundaries accounted for more than 90% of the low ΣCSL grain boundaries, and simultaneously the large-sized highly-twinned grain-cluster microstructure was formed. The microstructure consisted of Σ3-Σ3-Σ9 or Σ3-Σ9-Σ27 trigeminal grain boundaries. In addition, the size of grain-cluster decreased with the increase of pre-strain. So it was concluded that the controlling of grain boundary distribution of GH3625 alloy was mainly achieved through the Σ3n grain boundary formed during recrystallization annealing rather than through the cold deformation. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：673 / 679
页数：6
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