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<p>Under the annealing treatment of 900 ~ 1150&#xa0;°C, the multi-pass low-pressure reciprocating cold-rolling (MLR-CR) process and less-pass high-pressure unidirectional cold-rolling (LHU-CR) process of tantalum–tungsten alloy were studied. The microstructure and mechanical properties under the two conditions were characterized and analyzed. The results show that the mechanical properties of MLR-CR process were obviously improved at the same annealing treatment conditions. Even under the annealing condition of 1150&#xa0;°C, the yield strength of MLR-CR process still reached over ~ 370&#xa0;MPa. The microhardness was maintained at 220-240HV, and the elongation was close to 48%. Compared with LHU-CR process, the comprehensive mechanical properties of tantalum–tungsten alloy was improved under the condition of MLR-CR process, which was mainly attributed to the fine microstructure of MLR-CR process. Under the same annealing conditions, the dislocation density increased and recrystallization phenomenon was delayed in MLR-CR process compared with LHU-CR process. The mechanical properties of MLR-CR process are improved by dislocation strengthening and grain refinement synergistically.</p>

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Improvement of Mechanical Properties of Tantalum–Tungsten Alloy by Multi-pass Low-Pressure Reciprocating Cold-Rolling Process Combined with Annealing Treatment

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Yulong Yang,
  • Yanping Zeng,
  • Leijun Zhan,
  • Zengyang Huang,
  • Zhongchen Xu,
  • Zhaobin Gong,
  • Shaolei Liu,
  • Zhiyong Zhao

摘要

Under the annealing treatment of 900 ~ 1150 °C, the multi-pass low-pressure reciprocating cold-rolling (MLR-CR) process and less-pass high-pressure unidirectional cold-rolling (LHU-CR) process of tantalum–tungsten alloy were studied. The microstructure and mechanical properties under the two conditions were characterized and analyzed. The results show that the mechanical properties of MLR-CR process were obviously improved at the same annealing treatment conditions. Even under the annealing condition of 1150 °C, the yield strength of MLR-CR process still reached over ~ 370 MPa. The microhardness was maintained at 220-240HV, and the elongation was close to 48%. Compared with LHU-CR process, the comprehensive mechanical properties of tantalum–tungsten alloy was improved under the condition of MLR-CR process, which was mainly attributed to the fine microstructure of MLR-CR process. Under the same annealing conditions, the dislocation density increased and recrystallization phenomenon was delayed in MLR-CR process compared with LHU-CR process. The mechanical properties of MLR-CR process are improved by dislocation strengthening and grain refinement synergistically.