Strength Improvement and Interface Characteristic of
Dissimilar Metal Joints for TC4 Ti Alloy to Nitinol NiTi alloy

Yan Zhang; DeShui Yu; JianPing Zhou; DaQian Sun; Hong Mei Li

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ISSN: 2641-6921

Modern Approaches on Material Science

Research Article(ISSN: 2641-6921)

Strength Improvement and Interface Characteristic of Dissimilar Metal Joints for TC₄ Ti Alloy to Nitinol NiTi alloy

Volume 3 - Issue 1

**Yan Zhang¹*, DeShui Yu¹, JianPing Zhou¹, DaQian Sun² and Hong Mei Li²**

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- ¹Xinjiang University, School of Mechanical Engineering, Wulumuqi 830000, China
- ²Jilin University, School of Materials Science and Engineering, Changchun 130022, China
*Corresponding author: Yan Zhang, Xinjiang University, School of Mechanical Engineering, Wulumuqi 830000, China

Received: May 15, 2020; Published: May 26, 2020

DOI: 10.32474/MAMS.2020.03.000152

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Abstract

Laser welding of TC₄ Ti alloy to NiTi alloy has been applied using pure Cu as an interlayer. Mechanical properties of the joints were evaluated by tensile tests. Based on avoiding the formation of Ti-Ni intermetallics in the joint, three welding processes for Ti alloy-NiTi alloy joint were introduced. The joint was formed while the laser was acted on the Cu interlayer. Experimental results showed that Cu interlayer was helping to decrease the Ti-Ni intermetallics by forming Ti-Cu phases in the weld. The average tensile strength of the joint was 216 MPa.

Keywords: Ti alloy; NiTi alloy; Cu interlayer; Laser welding; Microstructure; Tensile strength

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