Revealing the Superior Post-Necking Elongation in the Fine-Grained Ti-6Al-4V ELI at Cryogenic Temperature

Metals Pub Date : 2024-05-20 DOI:10.3390/met14050600

Quan Gao, Rengeng Li, Hao Wu, Kesong Miao, He Wu, Chenglu Liu, Xuewen Li

引用次数: 0

Abstract

The mechanical properties of a fine-grained (FG) Ti-6Al-4V extra-low interstitial (ELI) alloy were investigated by tensile tests at 298 K and 77 K. The experimental results indicated that, at 77 K, the alloy exhibits a small uniform elongation of 2.65%, but has a fracture elongation of 19.2%, showing superior post-necking elongation. At 298 K, the alloy displays a single dislocation slipping, β→α″ phase transformation occurred, and 6.35% uniform elongation was obtained, whereas the coupling of dislocation slipping and twinning deformation behaviors dominated at 77 K. The limited uniform elongation is attributed to the absence of martensite phase transformation at 77 K, whereas the decent fracture elongation is ascribed to the resistance offered by twinning against plastic instability.

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揭示低温条件下细粒度 Ti-6Al-4V ELI 卓越的缩颈后伸长率

通过在 298 K 和 77 K 下进行拉伸试验，研究了细晶粒（FG）Ti-6Al-4V 超低间隙（ELI）合金的力学性能。实验结果表明，在 77 K 下，合金的均匀伸长率较小，仅为 2.65%，但断裂伸长率高达 19.2%，显示出优异的颈后伸长率。在 298 K 时，合金显示出单一的位错滑动，发生了 β→α″ 相变，获得了 6.35% 的均匀伸长率，而在 77 K 时，位错滑动和孪晶变形行为的耦合占主导地位。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Metals

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