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Synthesis and characteristics of consolidated nanocrystalline two-phase Ag50Ni50 alloy by hot pressing

Journal Article


Abstract


  • Silver and nickel are mutually only very slightly soluble and have a positive heat of mixing. Ag50Ni50 powder was prepared by mechanical alloying (MA) for 200 h and subsequent hot pressing (HP) at 620°C under 60 MPa. XRD results indicated that ball milling produced a two-phase mixture of supersaturated, nanocrystalline Ag-rich (α-phase) and Ni-rich (β-phase) solid solutions with grain sizes of 5 and 4 nm, respectively. The grain sizes increased to about 40 and 26 nm after hot pressing. The HP Ag50Ni50 had a density very close to the theoretical value. The HP alloy consisted of an interconnected network of the α-phase and islands of a two-nanophase mixture rich in the β-phase. The stability of the microstructure of the alloy and the effects of mechanical alloying on the supersaturation of the two phases and on the formation of the Ag-rich network are also discussed.

Publication Date


  • 2000

Citation


  • Zhao, Z. L., Zhao, Y., Niu, Y., Wang, C. L., & Wu, W. T. (2000). Synthesis and characteristics of consolidated nanocrystalline two-phase Ag50Ni50 alloy by hot pressing. Journal of Alloys and Compounds, 307(1-2), 254-258. doi:10.1016/S0925-8388(00)00820-3

Scopus Eid


  • 2-s2.0-0034226568

Start Page


  • 254

End Page


  • 258

Volume


  • 307

Issue


  • 1-2

Abstract


  • Silver and nickel are mutually only very slightly soluble and have a positive heat of mixing. Ag50Ni50 powder was prepared by mechanical alloying (MA) for 200 h and subsequent hot pressing (HP) at 620°C under 60 MPa. XRD results indicated that ball milling produced a two-phase mixture of supersaturated, nanocrystalline Ag-rich (α-phase) and Ni-rich (β-phase) solid solutions with grain sizes of 5 and 4 nm, respectively. The grain sizes increased to about 40 and 26 nm after hot pressing. The HP Ag50Ni50 had a density very close to the theoretical value. The HP alloy consisted of an interconnected network of the α-phase and islands of a two-nanophase mixture rich in the β-phase. The stability of the microstructure of the alloy and the effects of mechanical alloying on the supersaturation of the two phases and on the formation of the Ag-rich network are also discussed.

Publication Date


  • 2000

Citation


  • Zhao, Z. L., Zhao, Y., Niu, Y., Wang, C. L., & Wu, W. T. (2000). Synthesis and characteristics of consolidated nanocrystalline two-phase Ag50Ni50 alloy by hot pressing. Journal of Alloys and Compounds, 307(1-2), 254-258. doi:10.1016/S0925-8388(00)00820-3

Scopus Eid


  • 2-s2.0-0034226568

Start Page


  • 254

End Page


  • 258

Volume


  • 307

Issue


  • 1-2