Microstructure and nanoscale composition analysis of the mechanical alloying of FexCu100-x (X=16, 60)

IMR OpenIR

	Microstructure and nanoscale composition analysis of the mechanical alloying of FexCu100-x (X=16, 60)
	J. Y. Huang; Y. D. Yu; Y. K. Wu; D. X. Li; H. Q. Ye
	1997
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	45 期号:1 页码:113-124
摘要	The microstructures of Fe16Cu84 and Fe60Cu40 (atomic percent) during mechanical alloying (MA) were studied by high resolution electron microscopy (HREM). Nanoscale composition distribution in Fe16Cu84 was determined using a HF 2000 FEG TEM. In the Fe16Cu84 specimen, a number of deformation twins were observed. In the Fe60Cu40 specimen, shear band and generation of nanocrystals in the shear band were observed, which is shown to be a typical mechanism for grain size reduction during MA. In both specimens, the b.c.c. grains tend to be very small (<5 nm) before alloying, which is shown to be a prerequisite condition for the dissolution of Fe in Cu and is also direct evidence to support the thermodynamical model proposed by Yavari et al. Nanoscale composition analysis in Fe16Cu84 specimen shows that the average Fe contents in both the interior of grains and the grain boundaries (GBs) are close to the designed composition, thus proving that a supersaturated solid solution has really formed. However, the Fe contents in both cases are rather inhomogeneous, indicating that the mixing of Fe and Cu during MA is inhomogeneous. The process of MA is suggested to be divided into two stages: at the early stage, the grain sizes reduce quickly to a steady value due to the mobility of dislocations; further deformation can be fully accommodated by GBs. As a result, very fast volume diffusion and GB diffusion are achieved. NC-structure and greatly enhanced diffusion coefficients allow the formation of supersaturated solid solutions in immiscible systems with positive enthalpy of mixing. Copyright (C) 1996 Acta Metallurgica Inc.
部门归属	huang, jy (reprint author), chinese acad sci,inst met res,atom imaging solids lab,shenyang 110015,peoples r china
关键词	Solid-solutions Specimen Preparation Immiscible Elements Powders Copper System
URL	查看原文
WOS记录号	WOS:A1997WB86900010
引用统计	被引频次：62[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37980
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Y. Huang,Y. D. Yu,Y. K. Wu,et al. Microstructure and nanoscale composition analysis of the mechanical alloying of FexCu100-x (X=16, 60)[J]. Acta Materialia,1997,45(1):113-124.
APA	J. Y. Huang,Y. D. Yu,Y. K. Wu,D. X. Li,&H. Q. Ye.(1997).Microstructure and nanoscale composition analysis of the mechanical alloying of FexCu100-x (X=16, 60).Acta Materialia,45(1),113-124.
MLA	J. Y. Huang,et al."Microstructure and nanoscale composition analysis of the mechanical alloying of FexCu100-x (X=16, 60)".Acta Materialia 45.1(1997):113-124.