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Formation of supersaturated solid solutions in the immiscible Ni-Ag system by mechanical alloying
Xu, J; Herr, U; Klasse, T; Averback, RS
Corresponding AuthorXu, J()
1996-04-15
Source PublicationJOURNAL OF APPLIED PHYSICS
ISSN0021-8979
Volume79Issue:8Pages:3935-3945
AbstractThe mechanical alloying process in the immiscible Ni-Ag system with a positive heat of mixing was investigated by x-ray diffraction and differential scanning calorimetry. High energy ball milling of mixed elemental powders, with nominal composition NixAg100-x (x = 95, 90, 70, 50, and 30), results in the formation of mixtures of supersaturated, nanocrystalline Ni-rich and Ag-rich solid solutions. The solubilities and final grain sizes of these phases depend on the nominal composition of the powder. The maximum solubilities were determined using Vegard's law to be 4.3 at. % Ni in Ag and 6.6 at. % Ag in Ni for samples milled at room temperature. The effect of milling temperature on mechanical alloying was examined in the range -195 to 250 degrees C. Lower temperature milling leads to a larger solubility of Ni in the Ag-rich samples, up to 7.1 at. % for the Ni30Ag70 composition. Indications for the existence of a concentrated solid solution (Ni36Ag64-Ni44Ag56) were also found. Milling at higher temperatures leads to lower solubilities. A study of the thermal stability of supersaturated Ag-rich and Ni-rich phases shows that milling at high temperature can be understood in terms of a competition between mechanical mixing and thermal decomposition. At room temperature, nonequilibrium vacancies are responsible for decomposition. The results give new insight into the general characteristics of the mechanical alloying process in thermodynamically unstable systems. (C) 1996 American Institute of Physics.
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Applied
WOS IDWOS:A1996UG87600020
PublisherAMER INST PHYSICS
Citation statistics
Cited Times:101[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/126645
Collection中国科学院金属研究所
Corresponding AuthorXu, J
AffiliationCHINESE ACAD SCI,MET RES INST,SHENYANG 110015,PEOPLES R CHINA
Recommended Citation
GB/T 7714
Xu, J,Herr, U,Klasse, T,et al. Formation of supersaturated solid solutions in the immiscible Ni-Ag system by mechanical alloying[J]. JOURNAL OF APPLIED PHYSICS,1996,79(8):3935-3945.
APA Xu, J,Herr, U,Klasse, T,&Averback, RS.(1996).Formation of supersaturated solid solutions in the immiscible Ni-Ag system by mechanical alloying.JOURNAL OF APPLIED PHYSICS,79(8),3935-3945.
MLA Xu, J,et al."Formation of supersaturated solid solutions in the immiscible Ni-Ag system by mechanical alloying".JOURNAL OF APPLIED PHYSICS 79.8(1996):3935-3945.
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