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<p>In this study, three different types of composite powders, NiTi, NiTiNb (20 wt.% Nb), and NiTiV (20 wt.% V), were produced using ball milling. The samples were then obtained using the P/M process. Dry sliding wear tests of the samples were performed at 23 and − 40&#xa0;°C. The results showed that the binary NiTi sample exhibited considerably greater surface damage at − 40&#xa0;°C than at room temperature. The least wear surface damage occurred in the NiTiV sample at both ambient temperatures. It was determined that adding 20 wt.% of Nb and V increased hardness to 695 and 818&#xa0;HV, respectively. When the calculated wear volume loss values were examined, it was determined that NiTi and NiTiV alloys wore more at − 40&#xa0;°C compared to room temperature. In NiTiNb, however, very similar wear values were obtained at RT and − 40&#xa0;°C, which was explained by the Nb additive suppressing the Ms transformation and protecting the austenite phase. Besides, the wear volume loss values of the Nb- and V-added samples decreased to approximately 1/6 of those of the binary NiTi sample at an ambient temperature of − 40&#xa0;°C. Overall, the COF values at − 40&#xa0;°C for all samples were higher than those at room temperature.</p>

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Ternary Element Effects of Nb and V Additives on the Low-Temperature Wear Behavior of NiTi-Based Shape Memory Alloys

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Mustafa Sabri Gök,
  • Yılmaz Küçük,
  • Farshid Khosravi,
  • Shashanka Rajendrachari,
  • Emre Altaş,
  • Kadir Mert Doleker,
  • Azmi Erdoğan

摘要

In this study, three different types of composite powders, NiTi, NiTiNb (20 wt.% Nb), and NiTiV (20 wt.% V), were produced using ball milling. The samples were then obtained using the P/M process. Dry sliding wear tests of the samples were performed at 23 and − 40 °C. The results showed that the binary NiTi sample exhibited considerably greater surface damage at − 40 °C than at room temperature. The least wear surface damage occurred in the NiTiV sample at both ambient temperatures. It was determined that adding 20 wt.% of Nb and V increased hardness to 695 and 818 HV, respectively. When the calculated wear volume loss values were examined, it was determined that NiTi and NiTiV alloys wore more at − 40 °C compared to room temperature. In NiTiNb, however, very similar wear values were obtained at RT and − 40 °C, which was explained by the Nb additive suppressing the Ms transformation and protecting the austenite phase. Besides, the wear volume loss values of the Nb- and V-added samples decreased to approximately 1/6 of those of the binary NiTi sample at an ambient temperature of − 40 °C. Overall, the COF values at − 40 °C for all samples were higher than those at room temperature.