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Shape memory characteristics and mechanical properties of high-density powder metal TiNi with post-sintering heat treatment

机译：烧结后热处理的高密度粉末金属TiNi的形状记忆特性和力学性能

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摘要

Through the use of fine titanium and nickel elemental powders and persistent liquid phase sintering, a high density powder metal Ti_(51)Ni_(49) with a high phase transformation temperature and enthalpy, and narrow transformation hysteresis, which are comparable to those of wrought TiNi alloys, are produced. However, due to the presence of a semi-continuous Ti_2Ni network, the shape recovery and tensile properties in the martensitic state at room temperature, determined using bending tests, are lower than those of cast TiNi counterparts. Through hot isostatic pressing and annealing above the peritectic temperature for sintered specimens, these properties are improved due to the increase in density and spheroidization of the Ti_2Ni compound. The phase transformation temperature and enthalpy are also enhanced due to the continuing carbon absorption by the Ti_4Ni_2X (X = C, 0) phase, which decreases the carbon content in the TiNi matrix.
机译：通过使用精细的钛和镍元素粉末以及持续的液相烧结，相变温度和焓高，相变滞后窄的高密度粉末金属Ti_（51）Ni_（49）可以与锻造相媲美。生产TiNi合金。但是，由于存在半连续的Ti_2Ni网络，使用弯曲试验确定的室温下马氏体状态下的形状恢复和拉伸性能低于铸造的TiNi对应物。通过热等静压并在高于包晶温度的条件下对烧结样品进行退火，由于Ti_2Ni化合物的密度增加和球化，这些性能得到改善。由于Ti_4Ni_2X（X = C，0）相持续吸收碳，相变温度和焓也得到增强，这降低了TiNi基体中的碳含量。

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