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Functionally Graded Ti-50.5Ni Alloy

机译：功能梯度Ti-50.5Ni合金

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Transformation behavior and shape memory characteristics of a temperature gradient annealing(TGA) treated Ti-50.5Ni(at%) alloyhave been investigated by means of differential scanning calorimetry(DSC) and thermal cycling tests under constant load. By annealing the specimen under the temperature gradient from 823 K to 658 K after solution treatment, the B19' martensitic transformation start temperature changed by 60 K along the length of sample (150mm). Temperature dependence of transformation elongation (dε/dT) of the TGA treated wire was found to be 0.16 %/K. By annealing the specimen under the temperature gradient from 823 K to 658 K after 47 % cold working without solution treatment, the B19' martensitic transformation start temperature changed by 61K along the length of sample(150mm). Temperature dependence of transformation elongation (dε/dT) of the TGA treated wire was found to be 0.04 %/K. The large decrease in dε/dT by cold working effect suggested that an introduction of dislocation was more effective than precipitates for lowering dε/dT.
机译：通过差示扫描量热法（DSC）和恒载热循环试验研究了温度梯度退火（TGA）处理的Ti-50.5Ni（at％）合金的相变行为和形状记忆特性。通过在固溶处理后在823 K至658 K的温度梯度下对样品进行退火，B19'马氏体转变开始温度沿样品长度（150mm）改变了60K。经TGA处理的焊丝的转变伸长率（dε/ dT）的温度依赖性为0.16％/ K。在不进行固溶处理的情况下，经过47％的冷加工后，在823 K至658 K的温度梯度下对样品进行退火，B19'马氏体转变开始温度沿样品长度（150mm）改变了61K。经TGA处理的焊丝的转变伸长率（dε/ dT）与温度的关系为0.04％/ K。 dε/ dT受冷加工效应的大幅降低表明，位错的引入比沉淀物降低dε/ dT更有效。

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