Thermo-mechanical grain refinement in gamma (gamma) based TiAl intermetallics

M. Usta; H. Wolfe; D. J. Duquette

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Thermo-mechanical grain refinement in gamma (gamma) based TiAl intermetallics

机译：γ（γ）基TiAl金属间化合物的热机械晶粒细化

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摘要

The purpose of this study was to refine the grain structure of cast and powder material (PM) Ti-48Al-2Cr-2Nb, and improve the room temperature properties of this alpha_2 + gamma alloy. Thermo-mechanical grain refinement was investigated at 950 and 1050 deg C for 50 percent deformation in cast material and at 50 and 75 percent deformation in the PM material. The grain size of the cast structure was reduced to 7-10 mum, whereas the grain size of the PM material decreased to submicron size. Room temperature compression tests revealed that the yield strength and the fracture stress of the alloys increase without an associated fracture energy loss. Submicron PM alloys showed intergranular fracture while as-received cast material exhibited cleavage fracture in room temperature tensile tests.

机译：这项研究的目的是改善铸造和粉末材料（PM）Ti-48Al-2Cr-2Nb的晶粒结构，并改善这种alpha_2 +γ合金的室温性能。研究了在950和1050摄氏度下，铸造材料的50％变形和PM材料的50％和75％变形时的热机械晶粒细化。铸造结构的晶粒尺寸减小到7-10微米，而PM材料的晶粒尺寸减小到亚微米尺寸。室温压缩试验表明，合金的屈服强度和断裂应力增加而没有相关的断裂能损失。在室温拉伸试验中，亚微米PM合金显示出晶间断裂，而按原样铸造的材料则表现出解理断裂。

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来源
《Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing》 |2003年第2期|p.168-177|共10页
作者
M. Usta; H. Wolfe; D. J. Duquette;
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作者单位

Materials Science and Engineering Department, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;

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原文格式 PDF
正文语种 eng
中图分类工程材料学;
关键词
Powder material; Thermo-mechanical grain refinement; Titanium Aluminide;

机译：粉末材料;热机械晶粒细化;铝化钛;

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Thermo-mechanical grain refinement in gamma (gamma) based TiAl intermetallics

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