Effects of rolling deformation on microstructure and hardness of Ti-45Al-9Nb-0.3Y alloy
The microstructure evolution of as-rolled Ti-45Al-9Nb-0.3Y alloy as well as the nanohardness of β/B2 matrix was investigated by means of scanning electron microscopy（SEM） in backscattered electron mode（BSE） mode, transmission electron microscopy（TEM） and nanoindentation. This high Nb containing Ti A...
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| Published in | Journal of rare earths Vol. 34; no. 2; pp. 197 - 202 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.02.2016
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-0721 2509-4963 |
| DOI | 10.1016/S1002-0721(16)60014-5 |
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| Abstract | The microstructure evolution of as-rolled Ti-45Al-9Nb-0.3Y alloy as well as the nanohardness of β/B2 matrix was investigated by means of scanning electron microscopy（SEM） in backscattered electron mode（BSE） mode, transmission electron microscopy（TEM） and nanoindentation. This high Nb containing Ti Al based alloy was rolled with 50%, 60%, 65% reduction, respectively. Omega phase precipitated in B2 phase with an orientation relationship of {110}_β//{11 2 0}_ω and 〈11 1〉_β//〈0001〉_ω. Moreover, with the increase of deformation reduction, rod-like structure which was formed in γ grain transformed from（α_2＋γ） lamellae structure into α_2 phase only. Additionally, nanoinentation experiment revealed that the precipitation hardening of ω phase increased the hardness of β/B2 phase. |
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| AbstractList | The microstructure evolution of as-rolled Ti-45Al-9Nb-0.3Y alloy as well as the nanohardness of β/B2 matrix was investigated by means of scanning electron microscopy (SEM) in backscattered electron mode (BSE) mode, transmission electron microscopy (TEM) and nanoindentation. This high Nb containing TiAl based alloy was rolled with 50%, 60%, 65% reduction, respectively. Omega phase precipitated in B2 phase with an orientation relationship of {110}β//{11▪0}ω and <1▪1>β// ω. Moreover, with the increase of deformation reduction, rod-like structure which was formed in γ grain transformed from (α2+γ) lamellae structure into α2 phase only. Additionally, nanoinentation experiment revealed that the precipitation hardening of ω phase increased the hardness of β/B2 phase.
3D microstructure of as-rolled Ti-45Al-9Nb-0.3Y alloy (with a reduction of 50%) The microstructure evolution of as-rolled Ti-45Al-9Nb-0.3Y alloy as well as the nanohardness of β/B2 matrix was investigated by means of scanning electron microscopy（SEM） in backscattered electron mode（BSE） mode, transmission electron microscopy（TEM） and nanoindentation. This high Nb containing Ti Al based alloy was rolled with 50%, 60%, 65% reduction, respectively. Omega phase precipitated in B2 phase with an orientation relationship of {110}_β//{11 2 0}_ω and 〈11 1〉_β//〈0001〉_ω. Moreover, with the increase of deformation reduction, rod-like structure which was formed in γ grain transformed from（α_2＋γ） lamellae structure into α_2 phase only. Additionally, nanoinentation experiment revealed that the precipitation hardening of ω phase increased the hardness of β/B2 phase. |
| Author | 张树志 张长江 侯赵平 孔凡涛 陈玉勇 |
| AuthorAffiliation | School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China Shanxi Key Laboratory of Advanced Magne- sium-based Materials, Taiyuan University of Technology, Taiyuan 030024, China National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China |
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| Keywords | TNB alloy high Nb containing TiAl based alloy omega phase phase transformation nanohardness hot rolling rare earths |
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| Title | Effects of rolling deformation on microstructure and hardness of Ti-45Al-9Nb-0.3Y alloy |
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