A Review of Selective Laser Melted NiTi Shape Memory Alloy

Abstract

NiTi shape memory alloys (SMAs) have the best combination of properties among the different SMAs. However, the limitations of conventional manufacturing processes and the poor manufacturability of NiTi have critically limited its full potential applicability. Thus, additive manufacturing, commonly known as 3D printing, has the potential to be a solution in fabricating complex NiTi smart structures. Recently, a number of studies on Selective Laser Melting (SLM) of NiTi were conducted to explore the various aspects of SLM-produced NiTi. Compared to producing conventional metals through the SLM process, the fabrication of NiTi SMA is much more challenging. Not only do the produced parts require a high density that leads to good mechanical properties, strict composition control is needed as well for the SLM NiTi to possess suitable phase transformation characteristics. Additionally, obtaining a good shape memory effect from the SLM NiTi samples is another challenging task that requires further understanding. This paper presents the results of the effects of energy density and SLM process parameters on the properties of SLM NiTi. Its shape memory properties and potential applications were then reviewed and discussed.

Research on Surface Roughness of AlSi10Mg Parts Fabricated by Laser Powder Bed Fusion

“…During the LPBF process, the quality of the generated part strongly depends on the stability of the melting process. The stability of the melt pool directly influences the shape of the melt pool and mechanical properties of the final parts [18]. Poor wettability is caused by insufficient energy input, which results in poor metallurgical bonding and self-balling effects so that some pores and cracks remain after alloy solidification.…”

Clinical, industrial, and research perspectives on powder bed fusion additively manufactured metal implants

“…Parallel to development of beta-phase Ti alloys through in-situ alloying, considerable progress has been made in manufacturing alloys where complex geometries are impractical by traditional means, such as NiTi [155] and bulk metallic glasses (BMGs). The amorphous structure of BMGs, which enables low stiffness with up to 50% higher yield strength than Ti-6Al-4 V, has been linked to high biocompatibility [156].…”

A Deep Look at Metal Additive Manufacturing Recycling and Use Tools for Sustainability Performance

“…Consistently, MAM industries have adopted smart materials, such as shape memory alloys (SMA, Ni-based alloys), to provides flexible features like the reconfiguration of component structure and attaining the desired material property in limited time [22]. These materials are extremely useful for micro & nano-technologies used in medicine, space, synthetic biology, precise mechanics, computing, ICT, and other fields [19,20].…”

“…In this regard, another sustainable aspect of MAM application is presented by Yang et al, who investigated the environmental impact of product consolidation using binder jetting (BJ) MAM, procedure that helps to simplify the product structure, promote modularity, and eliminate fasteners, joints, and connectors, reducing assembly difficulties and cost. Simplifying product structure and functionality by applying optimal design changes (DfAM), the use of MAM technologies (BJ) during production, service, and end-of-life (EoL) activities has two important implications [21,22,31]: 1. The use of binder jetting moulds shows significant promise by optimising parts from a material perspective.…”

“…; •Reconfigured value chains with shorter and simpler supply chains, established production, innovative distribution models, and new collaborations[1,15,29].Some of the highly recommended assets of MAM for sustainable production can be summarised as follows[4,5,[21][22][23][24][25][26][27][28][29][30]:…”