Selective laser melting of NiTi alloy with superior tensile property and shape memory effect

By Zhiwei Xiong, Zhonghan Li, Zhenfeng Sun, S. Hao, Ying Yang, M. Li, Changhui Song, P. Qiu, L. Cui. Journal of Materials Science & Technology, 2019

179 citations recorded by the source corpus.

Abstract It is a challenge to develop complex-shaped NiTi shape memory alloy parts by traditional processing methods, due to the poor machinability of NiTi alloy. It is reported that selective laser melting (SLM) of additive manufacturing could overcome this problem. However, the reported SLM-produced NiTi exhibits poor tensile ductility due to the inner defects and adverse unidirectional columnar grains from SLM process. In this work, the defect-less SLM-NiTi with nondirective columnar grains was fabricated by optimizing the intraformational laser scanning length and interformational laser scanning direction. The obtained lath-shaped SLM-NiTi sample exhibits tensile strain of 15.6%, more than twice of the reported maximum result (˜7%). Besides, the SLM-NiTi part with complex geometry displays a shape memory recovery of 99% under compressive deformation of 50%.

Subfields: Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/a42481be67c59e7088d482c82f4945a537106873

How researchers see this paper

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In Materials Chemistry

1. Swee Leong Sing
2. W. Y. Yeong

In Mechanical Engineering

1. W. Y. Yeong
2. Swee Leong Sing
3. Jinliang Zhang
4. B. Song
5. Yusheng Shi

Citations in the corpus

• The microstructure of a selective laser melting (SLM)-fabricated NiTi shape memory alloy with superior tensile property and shape memory recoverability (2020, unknown): “Optimizing processing parameters of the SLM process can reduce internal pores and micro-cracks, thereby preventing the formation of directional columnar grains to improve the production quality and performance of SLM-fabricated NiTi [4,11–13].”
• Laser powder bed fusion additive manufacturing of NiTi shape memory alloys: a review (2023, methodology): “6% was fabricated with a unique stripe rotation scanning strategy, as mentioned before [68].”
• Laser powder bed fusion for metal additive manufacturing: perspectives on recent developments (2020, background): “Furthermore, Xiong et al. reported a 99% shape recovery rate when L-PBF NiTi thin walls are compressively deformed by 50% (Figure 4) (Xiong et al. 2019).”