Microstructure investigations of ball milled materials

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	Microstructure investigations of ball milled materials
	J. Y. Huang; Y. K. Wu; H. Q. Ye
	1998
发表期刊	Microscopy Research and Technique
ISSN	1059-910X
卷号	40 期号:2 页码:101-121
摘要	HREM and FEG TEM were emphasized and extensively used to follow the most subtle changes in the structure and composition of ball-milled Cu, Fe-Cu, and thermally decomposed Fe(60)Cu(40). Some significant results are obtained and summarized as follows: HREM shows that the deformation of ball-milled copper proceeds mainly by twinning and shear bands (SBs) formation. The nano-grains formed during ball milling (BM) contain a high density of dislocations. The grain boundaries (GBs) of nanocrystalline (NC) Cu prepared by BM are ordered, curved, and strained, but disordering, lattice distortion, and nanovoids in local regions were frequently observed. Nanoscale composition analysis on mechanically alloyed Fe(16)Cu(84) shows that the average Fe content in both the interior of grains and the GBs is close to the designed composition, which proves that a supersaturated solid solution has really formed. However, the Fe content is rather inhomogeneous between the larger and smaller grains, which infers the inhomogeneous mixing of Fe and Cu during mechanical alloying (MA). NC structure and the mechanical force-enhanced fast diffusion are the reasons of the formation of supersaturated solid solutions in immiscible systems with positive enthalpy of mixing. HREM observations carried out with the thermally decomposed Fe(60)Cu(40) solid solution show that the Nishiyama (N-W) or Kurdyumov-Sachs (K-S) orientation relationships exist between alpha-Fe and Cu. Energy dispersive X-ray spectra (EDXS) results show that the Cu content in these alpha-Fe grains reaches as high as 9.5 at.% even after heating to 1,400 degrees C, which is even higher than the maximum solubility of Cu in gamma-Fe at 1,094 degrees C. (C) 1998 Wiley-Liss, Inc.
部门归属	acad sinica, inst met res, atom imaging solids lab, shenyang 110015, peoples r china.;ye, hq (reprint author), acad sinica, inst met res, atom imaging solids lab, shenyang 110015, peoples r china;qwlong@bepc2.ihep.ac.cn
关键词	Mechanical Alloying High-resolution Electron Microscopy Nanocrystalline Deformation Twinning Solid Solution Solid-solutions Nanocrystalline Materials Specimen Preparation Powders Metals Copper Hrem Intermetallics Deformation System
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WOS记录号	WOS:000071748600003
引用统计	被引频次：17[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/321006/37679
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. K. Wu,H. Q. Ye. Microstructure investigations of ball milled materials[J]. Microscopy Research and Technique,1998,40(2):101-121.
APA	J. Y. Huang,Y. K. Wu,&H. Q. Ye.(1998).Microstructure investigations of ball milled materials.Microscopy Research and Technique,40(2),101-121.
MLA	J. Y. Huang,et al."Microstructure investigations of ball milled materials".Microscopy Research and Technique 40.2(1998):101-121.