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

被引：11

作者：

Zhao, ZL ^{[1
]}

Zhao, Y ^{[1
]}

Niu, Y ^{[1
]}

Wang, CL ^{[1
]}

Wu, WT ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, State Key Lab Corros & Protect, Shenyang 110015, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2000年 / 307卷

关键词：

Ag-Ni alloys; mechanical alloying; hot pressing; nanocrystalline; two-phase alloy;

D O I：

10.1016/S0925-8388(00)00820-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 degrees C under 60 MP3, XRD results indicated that ball milling produced a two-phase mixture of supersaturated, nanocrystalline Ag-rich (alpha-phase) and Ni-rich (beta-phase) solid solutions with grain sizes of 5 and 3 nm, respectively. The grain sizes increased to about 40 and 3-6 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 alpha-phase and islands of a two-nanophase mixture rich in the beta-phase. The tability 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. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：254 / 258

页数：5

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