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

Wei Zhao; Wenjia Su; Liang Li; Ding Fang; Ni Chen

doi:10.1007/s12540-020-00869-5

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자료유형: 학술저널

저자정보: Wei Zhao (Nanjing University of Aeronautics and Astronautics) Wenjia Su (Nanjing University of Aeronautics and Astronautics) Liang Li (Nanjing University of Aeronautics and Astronautics) Ding Fang (AVIC Chengdu Aircraft Industrial (Group) Co. Ltd.) Ni Chen (Nanjing University of Aeronautics and Astronautics)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9

발행연도: 2021.9

수록면: 3,214 - 3,224 (11page)

DOI: 10.1007/s12540-020-00869-5

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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 understandthe various physical phenomena in the cryogenic cutting process, cryogenic impact test, and tensile test of titanium alloyTi?6Al?4V were undertaken in this work. The impact and tensile properties of Ti?6Al?4V alloy in the temperature range of20 to ? 196 °C were investigated. Later on, the macroscopic and microscopic morphology of the produced fractures wereanalyzed. Findings have depicted a decreasing impact toughness and an increase of tensile and yield strength of Ti?6Al?4Valloy 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 zonescorrespond to the shear fracture zone, crack initiation zone, and crack extension zone, respectively. With the temperaturedecrease, 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. Somedimples were found in the tensile fracture at ? 196 °C indicating the ability of Ti?6Al?4V alloy to deform plastically undersuch low temperature. This work is a fundamental support to analyze the behavior of Ti?6Al?4V alloy under cryogeniccooling conditions.

#Ti?6Al?4V alloy #Mechanical property #Impact toughness #Tensile strength #Yield strength #Fracture morphology

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