Correlation between dislocation-density-based strain hardening and microstructural evolution in dual phase TC6 titanium alloy
Correlation between dislocation-density-based strain hardening and microstructural evolution in dual phase TC6 titanium alloy
复制标题
双相TC6钛合金基于位错密度的应变硬化与显微组织演化的相关性
DOI：
10.1016/j.msea.2017.12.098
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发表时间：
2018-02
期刊：
影响因子：
--
通讯作者：
Xin Liu
中科院分区：
文献类型：
--
作者：
Ran Shi;Zhihua Nie;Qunbo Fan;Fuchi Wang;Yu Zhou;Xin Liu
由于钛合金的显微组织复杂，人们对其应变硬化的认识很少。因此，采用高能x射线衍射研究了原位拉伸载荷下双相TC6 （Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si）钛合金α相和β相的塑性变形过程。通过x射线衍射线谱分析和透射电镜测量，定量了α相和β相的位错密度演变。在此基础上计算的应变硬化速率与应力-应变曲线上的应变硬化行为相吻合。此外，通过透射电镜（TEM）观察，阐明了亚晶界和滑移系统之间相互作用的影响。应变硬化速率和位错密度的演变与不同变形条件下形成的典型组织相关，并可以很好地解释。
Owing to their complex microstructures, the strain hardening of titanium alloys remains poorly understood. Therefore, the plastic deformation processes of theαandβphases in dual-phase TC6 (Ti–6Al–2.5Mo–1.5Cr–0.5Fe–0.3Si) titanium alloy were investigated via high-energy X-ray diffraction with in situ tensile loading. Dislocation density evolution in both theαandβphases was quantified via X-ray diffraction line profile analysis complemented by transmission electron microscopy measurements. The strain hardening rate calculated based on this evolution matched the strain hardening behaviors shown in the stress-strain curves. Furthermore, the effect of interactions between subgrain boundaries and slip systems were elucidated through transmission electron microscopy (TEM) observations. The evolution of strain hardening rate, as well as the dislocation density, was correlated with and well explained by the typical microstructures formed in different deformation regimes.
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影响因子：
6
作者：
Sun, F.;Zhang, J. Y.;Prima, F.
通讯作者：
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