锻压技术

多轴低温锻造及低温退火对TiZrNb多主元合金组织和力学性能的影响

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

作者：颜芷旺1 熊峰1 李义朋1 唐思文1 颜建辉2

单位：1. 湖南科技大学机电工程学院 2. 湖南科技大学材料科学与工程学院

关键词：多主元合金多轴低温锻造低温退火显微组织力学性能

分类号：TG316.4

出版年,卷(期):页码：2025,50(8):19-28

摘要：

采用真空感应熔炼制备了TiZrNb多主元合金，系统研究了多轴低温锻造(MACF)及后续退火工艺对TiZrNb多主元合金显微组织和力学性能的影响。结果表明：经5次MACF循环处理后，合金内部引入高密度的滑移带与扭折带,这些微观缺陷有效钉扎位错运动，使屈服强度显著提升至900 MPa;然而，高密度缠结位错限制了位错的后续滑移能力，导致低温锻造态合金的加工硬化率较低。对MACF试样进行673 K低温退火后，位错发生动态重组，形成了由硬化的滑移带网络包围低位错密度区域的独特亚结构,同时退火过程原位析出高密度纳米级ω相，有效优化了合金的强度-塑性匹配。最终，经5次MACF循环、673 K退火的试样展现出最优的综合力学性能，屈服强度达910 MPa，抗拉强度为972 MPa，同时伸长率提升至8.51%。

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%.

基金项目：

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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