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<p>In the Al matrix, through the formation of Ni core with intermetallic compounds such as Al<sub>3</sub>Ni<sub>2</sub> and Al<sub>3</sub>Ni, an in situ core-shell-type structure is developed using a powder metallurgy process. A low-temperature solid-state sintering process develops the in situ Ni-Al<sub>3</sub>Ni<sub>2</sub>-Al<sub>3</sub>Ni and Ni-Al<sub>3</sub>Ni<sub>2</sub> core-shell-type structure in the 60Al-20Ni-20Ti, 60Al-15Ni-25Ti, and 60Al-10Ni-30Ti alloys, respectively. XRD phase analysis revealed the presence of the intermetallic phase Al<sub>3</sub>Ni<sub>2</sub> for all three Al-Ni-Ti alloys, whereas the absence of Ni<sub>3</sub>Al phase only in the 60Al-10Ni-30Ti alloy. Microstructure analysis results revealed the presence of two layers of intermetallic compound Al<sub>3</sub>Ni<sub>2</sub> and Al<sub>3</sub>Ni on the outer surface of the unreactive Ni particles, developing a core-shell-type moiety for the 60Al-20Ni-20Ti and 60Al-15Ni-25Ti alloys. For all three Al-Ni-Ti alloys, a relative density of approximately 97% represents a better densification value achieved through the conventional powder metallurgy route. Among the three Al-Ni-Ti ternary alloys, 60Al-20Ni-20Ti has a low specific wear rate and lower wear coefficient than 60Al-15Ni-25Ti and 60Al-10Ni-30Ti alloy, which is mainly due to the presence of a higher amount of Ni-Al<sub>3</sub>Ni<sub>2</sub>and Ni-Al<sub>3</sub>Ni<sub>2</sub>-Al<sub>3</sub>Ni core-shell-type moiety in the alloy that improves the hardness and the load-bearing capacity of the Al matrix. </p>

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Structure–Property Relationship in an In Situ Core-Shell-Type Moiety Developed in Al-Ni-Ti Alloys

  • 期刊论文

  • 发表日期：

    2025年5月5日

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  • Renu Prava Dalai,
  • Saroj Kumar Sahu,
  • Dinesh Kumar Mishra,
  • Ajit Behera

摘要

In the Al matrix, through the formation of Ni core with intermetallic compounds such as Al3Ni2 and Al3Ni, an in situ core-shell-type structure is developed using a powder metallurgy process. A low-temperature solid-state sintering process develops the in situ Ni-Al3Ni2-Al3Ni and Ni-Al3Ni2 core-shell-type structure in the 60Al-20Ni-20Ti, 60Al-15Ni-25Ti, and 60Al-10Ni-30Ti alloys, respectively. XRD phase analysis revealed the presence of the intermetallic phase Al3Ni2 for all three Al-Ni-Ti alloys, whereas the absence of Ni3Al phase only in the 60Al-10Ni-30Ti alloy. Microstructure analysis results revealed the presence of two layers of intermetallic compound Al3Ni2 and Al3Ni on the outer surface of the unreactive Ni particles, developing a core-shell-type moiety for the 60Al-20Ni-20Ti and 60Al-15Ni-25Ti alloys. For all three Al-Ni-Ti alloys, a relative density of approximately 97% represents a better densification value achieved through the conventional powder metallurgy route. Among the three Al-Ni-Ti ternary alloys, 60Al-20Ni-20Ti has a low specific wear rate and lower wear coefficient than 60Al-15Ni-25Ti and 60Al-10Ni-30Ti alloy, which is mainly due to the presence of a higher amount of Ni-Al3Ni2and Ni-Al3Ni2-Al3Ni core-shell-type moiety in the alloy that improves the hardness and the load-bearing capacity of the Al matrix.