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Microstructural evolution, tensile property and dynamic compressive property of FSWed Ti–6Al–4V alloy

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Abstract

Friction stir welding was applied to Ti–6Al–4V plates with 5 mm in thickness. The microstructure and mechanical properties were investigated. A full lamellar microstructure was developed near the top surface, and the size of prior β grain gradually decreases as the distance from the top surface increases. The microstructure of the bottom is fine equiaxed α grains, and the mean size is 2 μm. A mixture microstructure consisting of primary α, lamellar α + β and fine equiaxed α is discovered in thermomechanically affected zone (TMAZ). Results of transverse tensile test show that the tensile strength of the joint reaches 98% that of the base material (BM). Quasi-static compression test shows that the joint exhibits larger compressive strength and failure strain than the BM. Dynamic compressive strength of the joint is close to that of the BM; furthermore, the strain at the peak stress and energy absorption of the joint are larger than those of the BM.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (No. 51571031).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Jia-Wei Bao, Su-Yuan Yang & Ting Yang

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  1. Jia-Wei Bao
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  2. Su-Yuan Yang
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  3. Ting Yang
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Correspondence to Su-Yuan Yang.

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Bao, JW., Yang, SY. & Yang, T. Microstructural evolution, tensile property and dynamic compressive property of FSWed Ti–6Al–4V alloy. Rare Met. 39, 169–175 (2020). https://doi.org/10.1007/s12598-018-1151-6

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  • DOI: https://doi.org/10.1007/s12598-018-1151-6

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