Dislocation evolution during thermal creep deformation in V-4Cr-4Ti with various thermal and mechanical treatments
Dislocation evolution during thermal creep deformation in V-4Cr-4Ti with various thermal and mechanical treatments
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DOI：
10.1016/j.jnucmat.2013.03.061
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发表时间：
2013-11
影响因子：
3.1
通讯作者：
T. Muroga;T. Nagasaka;P. Zheng;Yuan Li;Hideo Watanabe
中科院分区：
文献类型：
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作者：
T. Muroga;T. Nagasaka;P. Zheng;Yuan Li;Hideo Watanabe
研究了V-4Cr-4 Ti合金在1023 K热蠕变变形过程中的位错演化规律。用各种材料和实验变量（例如，引入位错的冷加工、引入高密度富Ti沉淀物的热老化、施加的应力和蠕变变形水平）。Burgers矢量分析表明，退火试样中由热蠕变引起的位错主要为α/2<1 1 1>型。冷<1 0 0><1 1 1>变形V-4Cr-4 Ti合金的α和/2型位错密度相当，但α/2型位错的比例<1 1 1>随蠕变变形的增加而增加。伯格斯矢量分数的类似变化，观察到的试样具有高密度的沉淀之前的冷加工。另一方面，冷加工后进行老化（即，应变时效）在蠕变变形期间有效地保持位错结构。
Dislocation evolution during thermal creep deformation was investigated at 1023 K for V–4Cr–4Ti alloys with various thermal and mechanical treatments. Changes in the density and Burgers vector of dislocations were examined with various materials and experimental variables (e.g., cold work introducing dislocations, thermal aging introducing high density of Ti-rich precipitates, applied stress, and creep deformation levels). The Burgers vector analysis showed that, in the annealed specimens, dislocations induced by the thermal creep were predominantly ofa/2<1 1 1> type. The densities ofa<1 0 0> anda/2<1 1 1> type dislocations were comparable for the cold worked V–4Cr–4Ti, but the fraction ofa/2<1 1 1> type dislocations increased with the creep deformation. Similar changes to the Burgers vector fraction were observed for specimens with a high density of precipitation prior to the cold work. On the other hand, cold work followed by aging (i.e., strain aging) was effective in keeping dislocation structures during the creep deformation.