Effect of Microstructures on the Deformation Behavior of Ti-6Al-4V Alloy at Ultra High Strain rate

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Journal of the Korea Institute of Military Science and Technology 2002;5(3):89-97.

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Ti-6Al-4V합금의 미세조직에 따른 초고속 변형특성

이유환, 이동근, 이성학, 최준홍, 허선무, 이종수

¹포항공과대학교 신소재공학과 항공재료연구센터
²국방과학연구소 1체계 개발본부
³국방과학연구소 기술연구본부

Abstract

In this study, the effect of $alpha$-phase morphology on the dynamic deformation behavior at ultra high strain rate was investigated by EBW(Explosive Bridge Wire) test. All of tests and analyses were conducted on three typical microstructures of Ti-6Al-4V alloy, i.e. equiaxed, widmanstatten and bimodal microstructures. The spall strength and HEL(Hugoniot Elastic Limit) of the specimens that have the thickness of 2mm and 4mm were highest with the bimodal microstructure. These results were similar with previous study which was performed by dynamic torsion test(Kolsky torsion test).

Key Words: Ti-6Al-4V alloy, Euiaxed, Widmanst$ddot{a}$tten, Bimodal, Explosive Bridge Wire Test, Hugoniot Elastic Limit, Spall strengh