Grain refinement of 1 at.% Ta-containing cast TiAl-based alloy by cyclic air-cooling heat treatment

被引：27

作者：

Zhang, Keren ^{[1
]}

Hu, Rui ^{[1
]}

Li, Jinguang ^{[1
]}

Yang, Jieren ^{[1
]}

Gao, Zitong ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

MATERIALS LETTERS | 2020年 / 274卷

基金：

中国国家自然科学基金;

关键词：

Intermetallic alloys and compounds; Refinement; Microstructure; Widmanstatten structures; Feathery-like structures; MICROSTRUCTURAL REFINEMENT; PHASE-TRANSFORMATIONS; TENSILE PROPERTIES; SIZE REFINEMENT; FRACTURE;

D O I：

10.1016/j.matlet.2020.127940

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The refinement of fully lamellar (FL) microstructure from similar to 400 mu m to similar to 40 mu m of as-cast Ti-48Al-3Nb-1Ta (at.%) alloy is successfully achieved by cyclic air-cooling heat treatment. The refinement mechanism is analyzed that the precipitation of Widmanstatten and Feathery-like structures originating with several orientations is promoted by Ta during air-cooling, which on next heat treatment cycle transforms to small lamellar colonies. After five cycles, the coarse FL microstructure is completely divided to small lamellar colonies. Room-temperature mechanical tests revealed that with the refinement, the ductility and strength are greatly improved compared with those of coarse FL microstructure.<bold> </bold>

引用

页数：4

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