Influence of Laser Scanning Speed on Phase Transformation and Superelasticity of 4D-printed Ti-Ni Shape Memory Alloys

doi:10.3901/JME.2020.15.065

Abstract

Abstract: By adjusting laser scanning speed during 4D printing, Ti-Ni shape memory alloys (SMAs) with different phase transformation temperatures and microstructures are manufactured. The influences of laser scanning speed on phase component, phase transformation temperature, microstructure and superelasticity of 4D-printed Ti-Ni SMAs are analyzed by various methods of XRD, DSC, SEM and cyclic compression experiment. The results show that the volume fraction of martensite (B19’) in 4D-printed TiNi SMAs decreases together with the gradually increased volume fraction of austenite (B2) when the laser scanning speed increases from 80 mm/s to 150 mm/s. Meanwhile, the martensite transformation start temperature (M_s) and the austenite transformation finish temperature (A_f) decrease with the increase of laser scanning speed. At the laser scanning speed of 80 mm/s, the cyclic compression experiments under austenite state (B2) show that the 4D-printed Ti-Ni SMAs have good superelasticity, exhibiting the stable recovery strain of 4.99% after ten times cyclic compression. It’s much higher than the recovery strain of 2.64%, which have been reported. With the increased laser scanning speed to 150 mm/s, the recovery strain remains at 4.55% after three cycle compressions.

Key words: 4D printing, shape memory alloy, phase transformation, superelasticity, microstructure

CLC Number:

TF124

LU Haizhou, MA Hongwei, LUO Xuan, YANG Chao, LI Yuanyuan. Influence of Laser Scanning Speed on Phase Transformation and Superelasticity of 4D-printed Ti-Ni Shape Memory Alloys[J]. Journal of Mechanical Engineering, 2020, 56(15): 65-71.

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