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Anisotropic tensile and actuation properties of NiTi fabricated with selective laser melting

机译:选择性激光熔化制备的NiTi的各向异性拉伸和驱动特性

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This study evaluates the anisotropic tensile properties of Ni50.1Ti49.9(in at%) components fabricated using an additive manufacturing (AM) process of selective laser melting (SLM). Dog-bone shaped tensile specimens were fabricated in three orthogonal building orientations (i.e., horizontal, edge, and vertical) with two different scanning strategies (i.e., alternating x/y and alternating in ± 45° to the x-axis). Next, the samples were subjected to tensile testing until failure, shape memory effect tests and thermal cycling under constant tensile stresses up to 500 MPa. Their failure surfaces were analyzed for possible microstructural defects. It was revealed that the build orientation and scanning strategy affect the texture/microstructure, and hence the failure stress, ductility, shape memory effect, and functional stability. Samples fabricated in the horizontal orientation with alternating x/y scanning strategy had the highest ultimate tensile strength (606 MPa) and elongation (6.8%) with the strain recovery of 3.54% after 4 shape memory effect cycles. At stress levels less than or equal to 200 MPa, these samples had the actuation strain greater than 3.8% without accumulation of noticeable residual strain. It was observed that the scanning strategy of alternating in ± 45° result in degraded mechanical and shape memory response, particularly in horizontal and edge samples.
机译:这项研究评估了Ni50.1Ti49.9(at%)组件的各向异性拉伸性能,这些组件使用选择性激光熔融(SLM)的增材制造(AM)工艺制造。狗骨形拉伸标本是在三种正交的建筑方向(即水平,边缘和垂直)上以两种不同的扫描策略(即x / y交替和与x轴成±45°交替)制成的。接下来,对样品进行拉伸测试,直到破坏,形状记忆效应测试和在高达500 MPa的恒定拉伸应力下的热循环。分析了它们的失效表面可能的微观结构缺陷。结果表明,构造方向和扫描策略会影响织构/微观结构,进而影响破坏应力,延展性,形状记忆效应和功能稳定性。在水平方向上以交替的x / y扫描策略制造的样品具有最高的极限拉伸强度(606 MPa)和伸长率(6.8%),经过4个形状记忆效应循环后的应变回复率为3.54%。在小于或等于200 MPa的应力水平下,这些样品的驱动应变大于3.8%,而没有明显的残余应变累积。观察到,在±45°范围内交替扫描的策略会降低机械和形状记忆响应,特别是在水平和边缘样本中。

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