MICROSTRUCTURAL EVOLUTION AND TRANSFORMATION PATHWAYS IN THE NEAR MONOTECTIC ZN RICH ZN-BI ALLOYS DURING RAPID SOLIDIFICATION

被引:21
作者
GOSWAMI, R
CHATTOPADHYAY, K
机构
[1] Centre for Advanced Study, Department of Metallurgy, Indian Institute of Science, Bangalore
来源
ACTA METALLURGICA ET MATERIALIA | 1994年 / 42卷 / 02期
关键词
D O I
10.1016/0956-7151(94)90494-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The possible pathways for microstructural development under nonequilibrium condition by the rapid solidification of alloys containing liquid miscibility gap have been studied using Zn-Bi binary alloys as a model system. The primary aim is to explore the possibility of the intermediate formation of a thermodynamically unstable solid solution as a precursor phase which can spontaneously decompose to yield nanodispersions. It is shown that the information of crystallographic shape of the nanosized dispersions obtained by transmission electron microscopy and the derived point groups can be utilised to arrive at a definite conclusion of this possibility. Our results establish the formation of such a solid solution owing to the kinetic process of nonequilibrium trapping in spite of a very strong clustering tendency. The latter leads to the spontaneous decomposition of the solid solution during quenching to yield nanodispersions.
引用
收藏
页码:383 / 393
页数:11
相关论文
共 26 条
  • [1] [Anonymous], 2017, MATER LETT
  • [2] Baker J.C., 1971, SOLIDIFICATION, P23
  • [3] BEYSENS D, 1983, 4TH P EUR S MAT SCI, P367
  • [4] Cahn J.W., 1982, P INT C SOL SOL PHAS, P3
  • [5] MONOTECTIC COMPOSITE GROWTH
    CAHN, JW
    [J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1979, 10 (01): : 119 - 121
  • [6] METASTABLE LIQUIDUS AND ITS EFFECT ON CRYSTALLIZATION OF GLASS
    CAHN, JW
    [J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1969, 52 (03) : 118 - &
  • [7] MONOTECTIC SOLIDIFICATION
    CHADWICK, GA
    [J]. BRITISH JOURNAL OF APPLIED PHYSICS, 1965, 16 (08): : 1095 - &
  • [8] RAPID SOLIDIFICATION AND DECOMPOSITION OF A HYPOMONOTECTIC AL-CD ALLOY
    CHATTOPADHYAY, K
    RAMACHANDRARAO, P
    [J]. JOURNAL OF MATERIALS SCIENCE, 1980, 15 (03) : 685 - 692
  • [9] NONEQUILIBRIUM TRAPPING IN AL-IN SYSTEM
    CHATTOPADHYAY, K
    RAVI, VA
    RANGANATHAN, S
    [J]. ACTA METALLURGICA, 1986, 34 (04): : 691 - 693
  • [10] A CRITERION FOR THE DETERMINATION OF MONOTECTIC STRUCTURE
    DERBY, B
    FAVIER, JJ
    [J]. ACTA METALLURGICA, 1983, 31 (07): : 1123 - 1130