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Evolution of Mechanical Properties of Ti–6Al–4V Alloy in the Temperature Range of 20 to − 196 °C

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Abstract

Cryogenic cooling is becoming an attractive method for machining difficult-to-cut materials to extend their machinability. However, it’s a challenging task to analyze the effect of cryogenic cooling on the machining. In order to better understand the various physical phenomena in the cryogenic cutting process, cryogenic impact test, and tensile test of titanium alloy Ti–6Al–4V were undertaken in this work. The impact and tensile properties of Ti–6Al–4V alloy in the temperature range of 20 to − 196 °C were investigated. Later on, the macroscopic and microscopic morphology of the produced fractures were analyzed. Findings have depicted a decreasing impact toughness and an increase of tensile and yield strength of Ti–6Al–4V alloy in the temperature range from 20 to − 196 °C. The impact fracture appeared as a tendency of becoming material brittle. Meanwhile, three kinds of zones of shear-lip, fiber, and radiation were found on the fracture morphology. Those zones correspond to the shear fracture zone, crack initiation zone, and crack extension zone, respectively. With the temperature decrease, the proportion of fiber zone was decreased, while a gradual increase in the radiation zone was observed. Besides, the fiber zone was observed for the macroscopic morphology of the fracture under the temperature of − 196 °C. Some dimples were found in the tensile fracture at − 196 °C indicating the ability of Ti–6Al–4V alloy to deform plastically under such low temperature. This work is a fundamental support to analyze the behavior of Ti–6Al–4V alloy under cryogenic cooling conditions.

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Funding

Supported by the National Key R&D Program of China (Grant No. 2018YFB2002202).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China

    Wei Zhao, Wenjia Su, Liang Li & Ni Chen

  2. Department of Engineering Technology, AVIC Chengdu Aircraft Industrial (Group) Co., Ltd., Chengdu, 610092, People’s Republic of China

    Ding Fang

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  1. Wei Zhao
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  2. Wenjia Su
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Contributions

WZ provided fundamental ideas and conducted proof reading of this paper. WS was in charge of the trial and wrote the first draft. LL made some critical revisions, and provided financial support. DF and NC assisted the trial and analysis. All authors read and approved the final manuscript.

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Correspondence to Wei Zhao.

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Zhao, W., Su, W., Li, L. et al. Evolution of Mechanical Properties of Ti–6Al–4V Alloy in the Temperature Range of 20 to − 196 °C. Met. Mater. Int. 27, 3214–3224 (2021). https://doi.org/10.1007/s12540-020-00869-5

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  • DOI: https://doi.org/10.1007/s12540-020-00869-5

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