锻压技术

真空感应熔炼制备Al0.86Ga0.14Nb半导体合金热轧变形行为

英文标题：Hot rolling deformation behavior on Al0.86Ga0.14Nb semiconductor alloy prepared by vacuum induction melting

作者：薛涛韩春红刘玉芳

分类号：TG146

出版年,卷(期):页码：2021,46(8):205-209

摘要：

选择热轧方法制备AlGaNb合金试样，对此过程的组织结构变化与变形行为进行了分析。研究结果表明：在铸态Al0.86Ga0.14Nb合金中形成了大量片状组织，其尺寸在200~240 μm之间，α2/γ片层间距在0.3~0.6 μm范围内，片层团晶界区域形成了粒径约为Φ8 μm的γ相晶粒；获得了厚度接近1 mm的AlGaNb合金，形成了光滑的界面组织。当片层受到热轧力的作用后，除了发生偏转外，还形成了间距更大的片层，获得了更宽的γ板条，而α2相的宽度减小。最初的变形阶段在片层板条内形成堆垛位错，γ相晶粒内发生了明显的位错塞积；在后续变形过程中，亚结构不断转变为大角度晶界，产生了更多的再结晶晶粒。在Al0.86Ga0.14Nb合金内形成了形态差异很大的孪晶组织，并且宽度均较大，大部分孪晶位于片层组织的晶界区域。

AlGaNb alloy samples were prepared by hot rolling method, and the structural changes and deformation behavior of this process were analyzed. The results show that many flake-like structures are formed in the as-cast Al0.86Ga0.14Nb alloy with the size of 200-240 μm, and γ-phase grains with the diameter of about Φ8 μm are formed in the grain boundary region of lamellar cluster with the α2/γ lamella spacing of 0.3-0.6 μm. Then, AlGaNb alloy with the thickness of close to 1 mm is obtained, and the smooth interface structure is formed. When the lamellae are subjected to hot rolling force, they are deflected and formed with larger spacing to obtain wider γ-slats, and the width of α2 phase is reduced. However, in the initial deformation stage, the stacking dislocation is formed in the lamellae, and the significant dislocation plugging occurs in the γ phase grains. Furthermore, in the subsequent deformation process, the substructure is changed to large angle grain boundary, and the more recrystallized grains are produced. In addition, the twin structures with larger morphologic differences are formed in Al0.86Ga0.14Nb alloy, their widths are relatively larger, and most of the twins are located in the grain boundary region of lamellar structure.

基金项目：

国家自然科学基金资助项目(41872176)；河南省高等学校重点科研资助项目(18B170004)

薛涛(1977-)，男，硕士，讲师 E-mail：jzszxuetao@126.com

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