Investigation on the martensitic transformation in gamma-Fe(N) nanoparticles

IMR OpenIR

	Investigation on the martensitic transformation in gamma-Fe(N) nanoparticles
	X. Q. Zhao; Y. Liang; Z. Q. Hu
	1996
发表期刊	Nanostructured Materials
ISSN	0965-9773
卷号	7 期号:3 页码:313-325
摘要	gamma-Fe(5.90-10.9 at. % N) nanoparticles ranging in diameters from 30 to 100 nm were prepared by laser-induced pyrolysis of mixtures of Fe(CO)(5) and NH3. During the quenching from high temperature to room temperature and even down to 4.2 K, no martensitic transformation occurred in these particles. Based on the effects of surface tension and refinement of grain size on the yield strength of the nanoparticles, the dependencies of nucleation driving force and the martensite-start temperature on the particle size was revealed, from a viewpoint of thermodynamics of martensitic transformation in the gamma-Fe(N) nanoparticles. It is suggested that the yield strength increment due to the surface tension and to the very fine crystallite grains is probably the predominant aspect responsible for inhibiting the nucleation of martensite and drastic decrease of the martensite-start temperature of the nanoparticles. High pressure of 0.5 - 4.0 GPa were adopted to induce the martensitic transition of the gamma-Fe nanoparticles. It is found that the extent of martensitic transformation increased with the increasing pressures, most individual gamma-Fe particles were partially transformed to martensite after pressurization.
部门归属	zhao, xq (reprint author), chinese acad sci,inst met res,state key lab rsa,shenyang 110015,peoples r china
关键词	Small Particles Nucleation Powders Metals Alloys Ms
URL	查看原文
WOS记录号	WOS:A1996UC06000004
引用统计	被引频次：14[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/321006/38492
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Q. Zhao,Y. Liang,Z. Q. Hu. Investigation on the martensitic transformation in gamma-Fe(N) nanoparticles[J]. Nanostructured Materials,1996,7(3):313-325.
APA	X. Q. Zhao,Y. Liang,&Z. Q. Hu.(1996).Investigation on the martensitic transformation in gamma-Fe(N) nanoparticles.Nanostructured Materials,7(3),313-325.
MLA	X. Q. Zhao,et al."Investigation on the martensitic transformation in gamma-Fe(N) nanoparticles".Nanostructured Materials 7.3(1996):313-325.