Change of Elastic Behavior in Binary β-Type Ti Alloys with Deformation
Change of Elastic Behavior in Binary β-Type Ti Alloys with Deformation
复制标题
二元β型钛合金弹性行为随变形的变化
DOI：
10.2320/jinstmet.70.110
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发表时间：
2006
影响因子：
--
通讯作者：
T. Senuma
中科院分区：
文献类型：
--
作者：
Y. Takemoto;I. Shimizu;A. Sakakibara;T. Senuma
本文系统研究了Ti-Mo、Ti-Nb和Ti-V三元钛合金的变形弹性行为。由α″马氏体组成的合金（如20 Nb和8 Mo）的循环加载-卸载拉伸应力-应变曲线显示出特殊的伪弹性行为。β稳定剂含量稍高的38 Nb、10- 14 Mo和15- 20 V合金，淬火时由β相和相应的ω相组成，在屈服前表现为线性弹性，但在{332}孪晶形成后表现为极端伪弹性。动态观察表明，在拉伸加载过程中形成的某些{332}孪晶在卸载过程中消失。中等含量的β稳定剂42 Nb和16 Mo合金表现出下凹的弹性曲线，以滑移和{332}孪晶的混合方式变形。在较高含量的合金上，发现杨氏模量开始上升的应力水平随着合金含量的增加而增加。这些弹性特征可概括为表观杨氏模量随应变的变化。
The aim of this study is to systematically investigate the elastic behavior with deformation of the binary titanium alloys of Ti-Mo, Ti-Nb and Ti-V. The stress-strain curve using cyclic load-unloading tensile test of alloys composed of α″ martensite, e.g. 20Nb and 8Mo, showed the peculiar pseudo-elastic behavior. A little higher content of β-stabilizer alloys of 38Nb, 10-14Mo and 15-20V, which were composed of β and commensurate ω phases by quench, indicated the liner elasticity until the yield but changed to the extreme pseudo-elasticity after {332} twin formation. Dynamic observation made clear certain {332} twin initially formed on tensile loading disappeared during unloading process. Medium content of β-stabilizer alloys of 42Nb and 16Mo exhibited a concave downward elastic curve and were deformed by mixture mode of slip and {332} twin. On the higher content alloys it was found that the stress level on which Young's modulus begins a rise increases with the increase of alloy content. These elastic features were summarized as change of apparent Young's modulus with increase of strain.