Microstructure, mechanical properties and shape memory effect of a new metastable Ti-W alloy

被引：5
作者：
Shao, Yang [1 ]
Zhu, Wendi [1 ]
Ge, Libo [1 ]
Cui, Liying [1 ]
Yu, Weikang [1 ]
Ma, Huan [2 ,3 ]
机构：
[1] Dalian Maritime Univ, Dept Mat Sci & Engn, Dalian 116026, Peoples R China
[2] Dalian Jiaotong Univ, Key Lab Near Net Forming Light Met Liaoning Prov, Dalian 116028, Peoples R China
[3] Dalian Jiaotong Univ, Engn Res Ctr Continuous Extrus, Minist Educ, Dalian 116028, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 895卷
关键词：
Ti -W alloys; Metastable alloys; Martensitic transformation; Shape memory effect; TUNGSTEN COILS; TA ALLOYS; DEGRADATION; COMPOSITES; MARTENSITE; TRANSITION; BEHAVIOR;
D O I：
10.1016/j.msea.2024.146208
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of tungsten content on the microstructure, mechanical properties and shape memory effect of Ti-W alloys were investigated in detail. The results showed that the microstructures and phase constitutions of Ti-W alloys were sensitive to tungsten contents. Only hexagonal alpha ' phase was found in Ti-10W alloy, while orthorhombic alpha '' martensite formed in Ti-15W alloy. When the content of W increased to 20 wt.%, metastable beta phase was found. The content of alpha '' phase decreased with further increasing W content. Transmission electron microscope results confirmed the presence of omega phase in Ti-20W and Ti-25W. The density of Ti-25W alloy was 5.65 g/ cm3. The elastic modulus, yield strength and hardness of Ti-W alloys decreased firstly and then increased with the additions of W. Ti-15W alloy exhibited the lowest elastic modulus of 68.4 GPa and yield strength of 309 MPa among all studied alloys, while the tensile elongation monotonically increased with increasing W additions. The Ti-10W alloy showed the highest yield strength of 516 MPa and the lowest elongation of 7.4%. The X-ray diffraction and transmission electron microscope results also confirmed the occurrence of the stress induced martensitic transformation of beta to alpha '' during tensile tests for Ti-25W alloy. Shape memory effect was also observed in Ti-W alloys. The Ti-25W alloy showed the maximal shape memory recovery ratio of 22%.
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页数：7
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