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Effects of Composition and Post Heat Treatment on Shape Memory Characteristics and Mechanical Properties for Laser Direct Deposited Nitinol

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Abstract

Nitinol structures were synthesized in a fully dense form using a laser direct deposition method. The pure elemental metal powders of nickel and titanium were used and powder ratios were controlled to arrive at the prescribed final chemical compositions of Nitinol. The transformation temperatures of synthesized Nitinol samples with different chemical composition and post heat treatment conditions were systematically analyzed and compared with those of conventional Nitinol. Compared to Nitinol parts produced by other techniques, the laser engineered net shaping (LENS) created the least amount of secondary phase, indicating the possibility of high corrosion resistance. Two step post processing of solution heat treatment and aging heat treatment was carried out to improve the homogeneity of the microstructure and to investigate its effects on phase transformation temperatures. The resultant phase transformation temperatures could be controlled by the heat treatment parameters. Compression test results showed mechanical properties of synthesized Nitinol samples are largely affected by its post heat treatment history while the effect of initial chemical composition was negligible.

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Acknowledgements

The authors wish to gratefully acknowledge the financial support provided for this study by the National Science Foundation (Grant No. CMMI-1233783).

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  1. Center for Laser-based Manufacturing, School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907, USA

    Jeongwoo Lee & Yung C. Shin

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  1. Jeongwoo Lee
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Lee, J., Shin, Y.C. Effects of Composition and Post Heat Treatment on Shape Memory Characteristics and Mechanical Properties for Laser Direct Deposited Nitinol. Lasers Manuf. Mater. Process. 6, 41–58 (2019). https://doi.org/10.1007/s40516-019-0079-5

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