Deforming TC6 titanium alloys at ultrahigh strain rates during multiple laser shock peening

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• 作者：Liucheng Zhou ; ^{happyzlch@163.com} ; Yinghong Li ; Weifeng He ; Guangyu He ; Xiangfan Nie ; Donglin Chen ; Zhilin Lai ; Zhibin An
• 关键词：TC6 titanium alloys ; Laser shock ; Ultrahigh strain rates ; High density dislocation ; Surface nanocrystalline
• 刊名：Materials Science and Engineering: A
• 出版年：2013
• 出版时间：20 August, 2013
• 年：2013
• 卷：578
• 期：Complete
• 页码：181-186
• 全文大小：1641 K

文摘

The deformation mechanism of TC6 titanium alloys at ultrahigh strain rates (>10⁶ s^?1) during multiple LSP was investigated. When nanosecond pulse and 1000 MW laser irradiated on the materials, the high pressure plasma shock wave was induced and ultrahigh strain rates response was caused in the material. The TEM observation of the surface layer indicates that a layer of nanocrystalline has been formed and is unevenly distributed after a single impact. Increasing impact times could provide longer time and more energy to dislocation movement which refines the grains into smaller size and makes the distribution uniform. The hardness of TC6 titanium alloy has been improved by a single laser shock peening, forming a severe plastic deformted layer with a depth of 200 ¦Ìm. Increasing impact times will improve the hardness and effective depth. The XRD test shows that the position of diffraction peak did not show any change, but the Bragg diffraction peak was broadened. Dislocation activity is a prevalent deformation mechanism of TC6 titanium alloy in the grain refinement study.