Microstructure and mechanical properties of Nb- and Mo-modified NiTi-Al-based intermetallics processed by isothermal forging

被引：8
|
作者：
Song, Xiaoyun [1 ]
Li, Yan [2 ,3 ]
Zhang, Fei [2 ]
机构：
[1] Gen Res Inst Nonferrous Met, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China
[2] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
[3] Beihang Univ, Minist Educ, Key Lab Aerosp Mat & Performance, Beijing 100191, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 594卷
基金：
中国国家自然科学基金;
关键词：
Intermetallics; NiTi-Al alloy; Isothermal forging; Microstructure; Tensile behavior; Fracture; SHAPE-MEMORY ALLOYS; OXIDATION BEHAVIOR; TEMPERATURE; RATIO;
D O I：
10.1016/j.msea.2013.11.070
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A compositionally modified Ni-45Ti-5Al-2Nb-1Mo (at%) alloy was developed by simultaneously adding Nb and Mo in NiTi-Al-based alloy and processed by forging isothermally. The as-forged Ni-45Ti-5Al-2Nb-1Mo alloy consists of NiTi matrix, Ti2Ni and dispersive (Nb,Ti)(SS) phases. Mo addition reduces the solubility of Nb in the NiTi matrix and gives rise to the precipitation of numerous nanoscale (Nb,Ti)(SS) phases (bcc structure) within the grains. The (Nb,Ti)(SS) phase is semi-coherent to the NiTi matrix with a lattice misfit of 6.7%. The addition of Mo and Nb dramatically enhances the NiTi-Al alloy at high temperatures, which is mainly attributed to the solid solution strengthening of Nb and Mo elements as well as the precipitation strengthening of (Nb,Ti)(SS) phases. The Ni-45Ti-5Al-2Nb-1Mo alloy is expected to become a high-temperature structural material using at intermediate temperatures with strengths of 650 MPa at 923 K and 350 MPa at 1073 K. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：229 / 234
页数：6
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