织构对激光定向能量沉积Ni<sub>50.8</sub>Ti形状记忆合金超弹性的影响

doi:10.19976/j.cnki.43-1448/TF.2023081

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Abstract NiTi shape memory alloy exhibits excellent superelasticity and shape memory effect due to thermoelastic martensitic phase transformation, and is widely used in medical devices, aerospace and other fields. Ni_50.8Ti shape memory alloy was prepared by laser directed energy deposition, the influences of forming angle on the superelasticity and stability of the alloy were analyzed by room temperature compression and cyclic compression experiments, the microstructure and texture characteristics of alloys with different forming angles were analyzed by X-ray diffraction analysis, electron backscatter diffraction and other characterization methods, and the influences of microstructure and texture on the superelasticity and stability of Ni_50.8Ti shape memory alloy were further studied. The results show that the Ni_50.8Ti shape memory alloy prepared by laser directed energy deposition is composed of B2 austenitic phase with uniform matrix composition and no cracking phenomenon. Alloy at 90° Y-axis shows the best superelasticity at room temperature, and the worst superelasticity at 0°. At the same time, the 45° alloy shows a strong 〈112〉 texture and the 90° alloy shows a strong 〈110〉 texture, the superelasticity of the strong texture alloy is better than that of the weak texture (60°) and the unfavorable orientation (0°) alloy, the texture has a significant influence on the microstructure and superelasticity of the Ni_50.8Ti shape memory alloy.

Key words： additive manufacturing directed energy deposition NiTi shape memory alloy texture

Received: 08 December 2023 Published: 26 March 2024

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TG139.6

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	WU Huiting
	LI Ruidi
	KANG Jingtao
	ZHENG Dan

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WU Huiting,LI Ruidi,KANG Jingtao, et al. Effect of texture on the superelasticity of Ni_50.8Ti shape memory alloy for laser directed energy deposition[J]. Materials Science and Engineering of Powder Metallurgy, 2024, 29(1): 63-73.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023081 OR http://pmbjb.csu.edu.cn/EN/Y2024/V29/I1/63

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