In-situ observations of the tensile deformation and fracture behavior of a fine-grained titanium alloy sheet

In-situ observations of the tensile deformation and fracture behavior of a fine-grained titanium alloy sheet
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细晶钛合金板材拉伸变形和断裂行为的原位观察

DOI:
10.1016/j.jallcom.2018.01.009
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发表时间:
2018-04
影响因子:
6.2
通讯作者:
Weidong Zeng
Weidong Zeng
中科院分区:
材料科学2区
文献类型:
--
作者:
Xuehua Zhang;Shuangyin Zhang;Qinyang Zhao;Yongqing Zhao;Rong Li;Weidong Zeng

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采用原位扫描电子显微镜(SEM)研究了工业Ti-6Al-4V钛合金板材在室温下的变形和裂纹萌生。结果表明,拉伸到屈服阶段,滑移带从α/α和α/β界面开始,滑移模式由单滑移发展到多滑移,最后出现交叉滑移。微裂纹主要萌生于相界或沿着α相内的滑移带,裂纹主要沿45°线沿着连接。断口上布满韧窝。沿晶开裂是主要的断裂机制。
Deformation and crack initiation of industrial Ti-6Al-4V titanium alloy sheet were investigated using in-situ scanning electron microscopy (SEM) at room temperature. The results showed that slip band originated from α/α and α/β interfaces when the tension reaches the yield stage, and the slip mode develops from single slip to multi slip and finally the cross-slip occurs. Microcracks initiate primarily at the phase boundary or along the slip band within α phase, cracks are mainly connected along the 45° line. The fracture surface is full of dimples. Intergranular cracking is the main fracture mechanism.
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