Martensitic transformations and the shape memory effect in Ti-Zr-Nb-Al high-temperature shape memory alloys

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• 作者：Fei Zhang^a ; ^b ; Zhiguo Yu^a ; ^b ; Chengyang Xiong^a ; ^b ; Wentao Qu^c ; Bifei Yuan^c ; Zhenguo Wang^a ; ^b ; Yan Li^a ; ^b ; ^{liyan@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Shape memory ; Microstructure ; Mechanical properties ; Martensitic transformation ; Ti-Zr
• 刊名：Materials Science & Engineering A
• 出版年：2017
• 出版时间：2 January 2017
• 年：2017
• 卷：679
• 期：Complete
• 页码：14-19
• 全文大小：1445 K

文摘

The microstructures, phase transformations, mechanical properties and shape memory effect of Ti-20Zr-10Nb-xAl (x=1, 2, 3, 4 at%) alloys were investigated. The X-ray diffraction results show that the alloys are composed of a single martensitic α″-phase and that the corresponding unit cell volume decreases with increasing Al content. The reverse martensitic transformation start temperature (A_s) of the Ti-20Zr-10Nb-Al alloy is 534 K and decreases with increasing Al content. The addition of Al results in solid solution strengthening and grain refinement strengthening, thus improving the mechanical properties and the shape memory effect of the Ti-20Zr-10 Nb-xAl alloys. The Ti-20Zr-10Nb-3Al alloy shows the greatest shape memory strain (3.2%) and the largest tensile strain (17.6%) as well as a very high tensile strength (886 MPa).