The pseudoelastic and shape memory effects of NiTi can be used in passive or active actuation systems. Often used in the aerospace industry, the use of NiTi for actuation is also growing in the biomedical fields and elsewhere. However, it's potential in industry is currently limited by the inability to produce complex NiTi parts. Conventional manufacturing processes are complicated by the extreme difficulty associated with machining NiTi. Furthermore, the transformation temperatures which drive the unique behavior of NiTi as a shape memory alloy are extremely sensitive to the relative concentrations of nickel and titanium. Therefore, exceptionally tight compositional control during production is necessary to guarantee ideal material behavior. Additive manufacturing (AM) is a near-net-shaping technology which allows for the direct fabrication of complex metallic components. By utilizing the AM processing principle, the poor machinability of NiTi is no longer an issue. Using AM also enables production of 3D geometries that are not possible using traditional techniques. Furthermore, direct CAD fabrication reduces the timescale of the concept-to-prototype transition. In the present work, an SLM machine (Phenix Systems PXM) is used to develop NiTi components directly from powder. The thermal characteristics and shape memory functionality of SLM NiTi components is demonstrated.
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机译:NITI的伪弹性和形状记忆效果可用于被动或主动致动系统。通常用于航空航天行业,利用NITI进行致动也在生物医学领域和其他地方生长。然而,它在工业中的潜力目前受到无法生产复杂的NITI部件的限制。通过与加工Niti相关的极端难度,传统的制造过程复杂。此外,驱动Niti作为形状记忆合金的独特行为的转化温度对镍和钛的相对浓度非常敏感。因此,在生产过程中特别紧密的组成控制是为了保证理想的材料行为。添加剂制造(AM)是近净成形技术,其允许直接制造复杂的金属组分。通过利用AM处理原理,NITI的可差不再是一个问题。使用AM还可以使用传统技术生产不可能的3D几何形状。此外,直接CAD制造减少了概念到原型转换的时间尺度。在本作工作中,SLM机器(Phenix Systems PXM)用于直接从粉末开发NITI组分。证明了SLM NITI组件的热特性和形状记忆功能。
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