TY - JOUR

T1 - Negative strain rate sensitivity of a Ti-8Al-1Mo-1V alloy with bimodal microstructure under quasi-static compression

AU - SHI, Xiao hui

AU - FAN, Zhi yuan

AU - CAO, Zu han

AU - Qiao, J. W.

AU - Eckert, J.

PY - 2021/2/1

Y1 - 2021/2/1

N2 - The compression behavior of a Ti-8Al-1Mo-1 V alloy with bimodal microstructure has been studied in the strain rate range of 2 × 10-3 s−1-2 × 10-1 s−1. The strain rate sensitivity shows a positive–negative-positive changing tendency with increasing strain rate. Moreover, serrated flow behavior was found in the first two changing stages of the strain rate sensitivity. Dynamic strain aging caused by solute atom-dislocation interaction within ultrafine α/α' lamellae is proved to be responsible for the appearance of serrations as well as the negative strain rate sensitivity. The reasons for the other two stages of positive strain rate sensitivity have also been analyzed.

AB - The compression behavior of a Ti-8Al-1Mo-1 V alloy with bimodal microstructure has been studied in the strain rate range of 2 × 10-3 s−1-2 × 10-1 s−1. The strain rate sensitivity shows a positive–negative-positive changing tendency with increasing strain rate. Moreover, serrated flow behavior was found in the first two changing stages of the strain rate sensitivity. Dynamic strain aging caused by solute atom-dislocation interaction within ultrafine α/α' lamellae is proved to be responsible for the appearance of serrations as well as the negative strain rate sensitivity. The reasons for the other two stages of positive strain rate sensitivity have also been analyzed.

KW - DSA

KW - Metals and alloys

KW - Microstructure

KW - Negative strain rate sensitivity

KW - Serrations

KW - Titanium alloy

UR - http://www.scopus.com/inward/record.url?scp=85096163622&partnerID=8YFLogxK

U2 - 10.1016/j.matlet.2020.128942

DO - 10.1016/j.matlet.2020.128942

M3 - Article

AN - SCOPUS:85096163622

VL - 284.2021

JO - Materials letters

JF - Materials letters

SN - 0167-577X

IS - Part 2

M1 - 128942

ER -