Transactions of Materials and Heat Treatment

Title：Influence of multi-axis cryogenic forging and low-temperature annealing on microstructure and mechanical properties of TiZrNb multi-principal element alloys

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ClassificationCode：TG316.4

year,vol(issue):pagenumber：2025,50(8):19-28

Abstract：

TiZrNb multi-principal element alloys (MPEAs) were prepared by vacuum induction melting, and the influence of multi-axial cryogenic forging (MACF) and subsequent annealing processes on the microstructure and mechanical properties of TiZrNb MPEAs were systematically investigated. The results indicate that after five MACF cycles, the high-density slip bands and kink bands are introduced into the alloy. These micro-defects effectively pin the dislocation motion, significantly increasing the yield strength to 900 MPa. However, the high-density tangled dislocations restrict the subsequent slip capability of dislocations, resulting in a low work-hardening rate of the alloy in cryogenic forged state. After the MACF-processed sample is annealed at 673 K, the dislocations undergo dynamic reorganization, and a unique substructure is formed, consisting of low-dislocation-density regions surrounded by hardened slip band networks. At the same time, a high-density nanoscale ω phase is precipitated in situ during the annealing process,

which effectively optimizes the strength-plasticity matching of the alloy. Ultimately, the sample subjected to five MACF cycles and annealed at 673 K exhibits the best comprehensive mechanical properties, with the yield strength of 910 MPa and the tensile strength of 972 MPa, while the elongation is increased to 8.51%.

Funds：

国家自然科学基金资助项目(52201170)；湖南科技大学博士科研启动基金(纵20240528)

作者简介：颜芷旺(2006-)，男，本科生 E-mail：1272286040@qq.com 通信作者：熊峰(1990-)，男，博士，副教授 E-mail：xiongfeng@hnust.edu.cn

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