Effect of N addition on nano-domain structure and mechanical properties of a meta-stable Ti-Zr based alloy
Effect of N addition on nano-domain structure and mechanical properties of a meta-stable Ti-Zr based alloy
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DOI：
10.1016/j.scriptamat.2021.114068
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发表时间：
2021-10
影响因子：
6
通讯作者：
Jie Fu;H. Y. Kim;S. Miyazaki
中科院分区：
文献类型：
--
作者：
Jie Fu;H. Y. Kim;S. Miyazaki
研究表明，在经历应力诱发马氏体相变的亚稳β型Ti-Zr基合金中加入N，可以获得高强度和超低模量的上级组合。Ti-18 Zr-3 Nb-2 Mo-3Sn合金表现出非常低的杨氏模量;然而，应力诱导马氏体相变发生在低应力水平下。N的加入促进了纳米尺寸的晶格调制（纳米畴）结构的形成，阻碍了应力诱发马氏体相变，导致更高的表观屈服应力、更窄的应力滞后和更大的非线性弹性。Ti-18 Zr-3 Nb-2 Mo-3 Sn-1.2 N合金表现出41 GPa的低杨氏模量和920 MP的高强度的出色组合，沿着具有可忽略不计的滞后的大恢复应变。
This study showed that a superior combination of high strength and ultra-low modulus can be achieved by the addition of N in a meta-stable β-type Ti–Zr based alloy undergoing stress-induced martensitic transformation. A Ti–18Zr–3Nb–2Mo–3Sn alloy exhibited a very low Young's modulus; however, the stress-induced martensitic transformation occurred at a low stress level. The addition of N facilitated the formation of nano-sized lattice modulation (nano-domain) structure and impeded the stress-induced martensitic transformation, leading to higher apparent yield stress, narrower stress hysteresis and large non-linear elasticity. A Ti–18Zr–3Nb–2Mo–3Sn–1.2N alloy exhibited an excellent combination of a low Young’s modulus of 41 GPa and a high strength of 920 MP along with a large recovery strain with negligible hysteresis.