Deformation and Fracture Behaviors of Ti6321 Titanium Alloy with Different Microstructures at Low Temperature and HighStrain Rate Conditions

doi:10.12382/bgxb.2021.0720

Abstract

Abstract: To close the research gap on marine titanium alloys at low temperatures and high strain rate rates, Ti6321 titanium alloys with three structures are prepared through heat treatment. The deformation and fracture behaviors of the three alloy samples within the temperature range of -80-25 ℃ and strain rate range of 2 500-3 500 s^-1 are studied. A low-temperature split Hopkinson pressure bar is used for loading. The evolution of the microstructure is observed and analyzed by an optical microscope and scanning electron microscope. The results show that the strength of Ti6321 titanium alloy increases and the plasticity decreases as the temperature declines. The bimodal structure has good strength and plasticity matching at room temperature. With the decrease of temperature, the equiaxed structure has higher strength and better low-temperature plastic deformation capability, and shows good low-temperature dynamic compression properties. The study of the alloy's fracture mechanism shows that the equiaxed and bimodal structures exhibit typical ductile fracture characteristics. The fracture of Widmanstatten structure is an uneven cleavage surface, which has an evident tendency to brittle fracture.

Key words: Ti6321titaniumalloy, lowtemperature, highstrainrate, microstructure, fracturebehavior

CLC Number:

TG146.2

LI Yanxing, WANG Lin, YAN Zhiwei, AN Rui, ZHOU Zhe, NING Zixuan, CHENG Huanwu, CHENG Xingwang. Deformation and Fracture Behaviors of Ti6321 Titanium Alloy with Different Microstructures at Low Temperature and HighStrain Rate Conditions[J]. Acta Armamentarii, 2022, 43(12): 3221-3227.

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