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Microstructure and properties of equiatomic Ti-Ni alloy fabricated by selective laser melting

机译：选择性激光熔化制备等原子Ti-Ni合金的组织与性能

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摘要

Selective Laser Melting (SLM) as one of the additive manufacturing technologies can be used to produce Ti-Ni shape memory alloys with complex shape. In this work, equiatomic Ti50Ni50 (at.%) samples were produced by SLM with different scanning speed, and near-fully dense (99.5% relative density) parts were obtained under a low input laser energy density (40 J/mm(3)) with the scanning speed of 1000 mm/s. The different scanning speeds had limited influence on the phase composition, transformation temperatures and Vickers hardness. Under low magnification, the typical molten pool morphology with inhomogenous microstructure was shown in the samples of SLM-produced Ti-Ni alloy, and self-accommodate martensite (B19') twins with a few austenite (B2), nanoscale Ti2Ni and rhombohedral (R) phases were found at higher magnification. Due to the formation of nanoscale Ti2Ni phase and inhomogenous microstructure, the SLM-produced Ti-Ni alloy exhbited lower phase transformation temperatures and larger hysteresis temperatures between the start and finish point of the phase transformation compared to the Ti-Ni powder. The formation of the R phase was contributed to the special repeat heating process and stress field formed by Ti2Ni phase and dislocations In SLM equiatomic Ti-Ni alloy. The SLM-produced Ti-Ni alloy exhibits higher compressive and tensile fracture strength but lower compressive and tensile fracture strain compared to the conventional cast samples.
机译：选择性激光熔化（SLM）作为增材制造技术之一，可用于生产形状复杂的Ti-Ni形状记忆合金。在这项工作中，通过SLM以不同的扫描速度生产了等原子的Ti50Ni50（at。％）样品，并且在低输入激光能量密度（40 J / mm（3））下获得了几乎完全致密（99.5％相对密度）的零件。 ）的扫描速度为1000 mm / s。不同的扫描速度对相组成，相变温度和维氏硬度的影响有限。在低放大倍率下，SLM生产的Ti-Ni合金样品以及具有少量奥氏体（B2），纳米级Ti2Ni和菱形（R）的自适应马氏体（B19'）孪晶的样品中显示出具有不均匀显微组织的典型熔池形态。 ）相在更高的放大倍数下发现。由于形成了纳米级的Ti2Ni相和不均匀的微观结构，与Ti-Ni粉末相比，SLM生产的Ti-Ni合金在相变的起点和终点之间表现出较低的相变温度和较大的磁滞温度。 R相的形成有助于特殊的重复加热过程以及Ti2Ni相和SLM等原子Ti-Ni合金中的位错形成的应力场。与传统铸造样品相比，用SLM生产的Ti-Ni合金具有较高的压缩和拉伸断裂强度，但压缩和拉伸断裂应变较低。

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