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<p>This study investigates the effect of a four-step hot rolling and two-step reverse hot rolling process on the mechanical properties of TZM alloy. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) analyses revealed that the grains of TZM-R alloy were significantly refined, with a higher dislocation density compared to the sintered TZM-S alloy. Room-temperature tensile testing showed that the yield strength and elongation of TZM-R alloy were improved by 100% and 140%, respectively, compared to TZM-S. Further analysis indicated that dislocation strengthening during the rolling process was the primary mechanism for the yield strength enhancement, contributing an additional 312.02&#xa0;MPa. Additionally, the rolling process increased the &lt; 110 &gt; ∥X texture in the alloy and promoted the formation of a high-density dislocation network, which effectively alleviated brittle intergranular fracture and significantly improved the elongation. The results suggest that the rolling process can effectively enhance the strength–ductility balance of TZM alloy, providing a new approach for its performance optimization.</p>

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Significant Improvement in Strength and Plasticity Achieved Simultaneously in TZM Alloy through Stored High-Density Dislocations

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Yusheng Li,
  • Quan Zhao,
  • Chao Xin,
  • Xinmei Liu,
  • Kui Yu,
  • Yan Pan,
  • Guodong Wang

摘要

This study investigates the effect of a four-step hot rolling and two-step reverse hot rolling process on the mechanical properties of TZM alloy. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) analyses revealed that the grains of TZM-R alloy were significantly refined, with a higher dislocation density compared to the sintered TZM-S alloy. Room-temperature tensile testing showed that the yield strength and elongation of TZM-R alloy were improved by 100% and 140%, respectively, compared to TZM-S. Further analysis indicated that dislocation strengthening during the rolling process was the primary mechanism for the yield strength enhancement, contributing an additional 312.02 MPa. Additionally, the rolling process increased the < 110 > ∥X texture in the alloy and promoted the formation of a high-density dislocation network, which effectively alleviated brittle intergranular fracture and significantly improved the elongation. The results suggest that the rolling process can effectively enhance the strength–ductility balance of TZM alloy, providing a new approach for its performance optimization.