Shock-induced phase transformation in tantalum
Shock-induced phase transformation in tantalum
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DOI：
10.1088/0953-8984/22/38/385702
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发表时间：
2010-09-29
影响因子：
2.7
通讯作者：
Hsiung, Luke L.
中科院分区：
文献类型：
--
作者：
Hsiung, Luke L.
本文报道了在30 GPa峰值压力下爆炸冲击纯钽和钽钨合金的透射电镜研究。虽然在冲击恢复的纯Ta和Ta-5 W中没有发现主要包含胞状位错结构的ω相，但在Ta-10 W中发现了冲击诱导的ω相，其包含密度高于1 × 10（12）cm（-2）的均匀分布的位错。当Ta-10 W在动压条件下受到冲击时，位错的动态回复受到很大程度的抑制，从而发生冲击诱导的α（bcc）→ ω（六角）相变。提出了一种基于位错的冲击相变机制。
A TEM study of pure tantalum and tantalum-tungsten alloys explosively shocked at a peak pressure of 30 GPa is presented. While no omega phase was found in shock-recovered pure Ta and Ta-5W which mainly contain a cellular dislocation structure, a shock-induced omega phase was found in Ta-10W which contains evenly distributed dislocations with a density higher than 1 x 10(12) cm(-2). The shock-induced alpha (bcc) -> omega (hexagonal) transition occurs when the dynamic recovery of dislocations becomes largely suppressed in Ta-10W shocked under dynamic-pressure conditions. A dislocation-based mechanism is proposed for the shock-induced phase transformation.