The four-step multiple stage transformation in deformed and annealed Ti49Ni51 shape memory alloy
The four-step multiple stage transformation in deformed and annealed Ti49Ni51 shape memory alloy
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DOI：
10.1016/j.actamat.2003.10.044
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发表时间：
2004-03
期刊：
影响因子：
9.4
通讯作者：
P. Su;Shyi-Kaan Wu
中科院分区：
文献类型：
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作者：
P. Su;Shyi-Kaan Wu
在20%变形和500 °C退火的Ti49Ni51形状记忆合金中观察到四步多阶段相变。在冷却过程中，在上述B2 →R和R→B19′峰之前出现两个额外的B2→B19′转变峰，这对应于在加热过程中在原始B19′→B2峰之后出现的一个新峰。这两个额外的峰是由剧烈冷加工和长时间退火对Ti49Ni51合金的共同作用引起的，它们分别来自于在低位错密度区和高位错密度区发生的B2→B19′相变，而这些位错密度区原本被冷加工抑制。
A four-step multiple stage transformation is observed in 20% deformed and 500 °C annealed Ti49Ni51shape memory alloy. Two extra B2→B19′transformation peaks appear before the previously described B2 →R and R→B19′peaks while cooling, and these correspond to one new peak, which appears after the original B19′→B2 peak during heating. These two extra peaks are caused by the combined effect of severe cold-working and long-time annealing on Ti49Ni51alloy, and they come separately from the B2→B19′transformation occurring in regions with low and high dislocation densities, which are originally suppressed by cold-working.