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<p>The powder compaction process for TiNi alloys in powder metallurgy has traditionally relied on empirical approaches, often resulting in compacts with low relative density and suboptimal recovery properties. To address this, the present study employed Kawakita, Shapiro, and Heckel compression equations to systematically evaluate the compaction behavior of metal powders. The analysis revealed that the mixed Ti₂Ni/TiNi₃ powders are prone to plastic/elastic deformation rather than particle rearrangement or fracture, with 800&#xa0;°C identified as the optimal compaction temperature for achieving superior comprehensive deformation properties. The fabricated TiNi alloys, with highly dense matrix, exhibited a microstructure consisting of a TiNi matrix, Ti₂Ni precipitates, and a needle-like Ni-rich phase. Both compressive stress and recovery strain were found to increase with prolonged sintering time. These findings establish a methodological framework for rationally assessing metal powder compaction properties, showcasing its potential to overcome the limitations of traditional trial-and-error methods.</p>

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A Useful Method to Characterize the Compaction Properties of Ti2Ni and TiNi3 Mixed Powders

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Li Xun,
  • Huang Zhong,
  • Wang Xinzhi,
  • He Xiaobo

摘要

The powder compaction process for TiNi alloys in powder metallurgy has traditionally relied on empirical approaches, often resulting in compacts with low relative density and suboptimal recovery properties. To address this, the present study employed Kawakita, Shapiro, and Heckel compression equations to systematically evaluate the compaction behavior of metal powders. The analysis revealed that the mixed Ti₂Ni/TiNi₃ powders are prone to plastic/elastic deformation rather than particle rearrangement or fracture, with 800 °C identified as the optimal compaction temperature for achieving superior comprehensive deformation properties. The fabricated TiNi alloys, with highly dense matrix, exhibited a microstructure consisting of a TiNi matrix, Ti₂Ni precipitates, and a needle-like Ni-rich phase. Both compressive stress and recovery strain were found to increase with prolonged sintering time. These findings establish a methodological framework for rationally assessing metal powder compaction properties, showcasing its potential to overcome the limitations of traditional trial-and-error methods.