Thermodynamic interpretation of the martensitic transformation in ultrafine gamma-Fe(N) particles

IMR OpenIR

	Thermodynamic interpretation of the martensitic transformation in ultrafine gamma-Fe(N) particles
	X. Q. Zhao; L. A. Yong; Z. Q. Hu; B. X. Liu
	1996
发表期刊	Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers
ISSN	0021-4922
卷号	35 期号:8 页码:4468-4473
摘要	Face centered cubic (fcc) gamma-Fe (5.9-10.4at.%N) ultrafine particles ranging in size from 30 to 100 nm prepared at room temperature by laser induced pyrolysis of Fe(CO)(5) and NH3. It is found that these austenitic particles did not transform to martensite when subsequently quenched to 77 K or 4.2 K, which is greatly lower than the martensite-start temperature of the bulk alloy with the same composition. Many planar defects, which can serve as the favorable martensitic nucleation sites in bulk austenite alloy, have been observed in these particles. Taking into account the size effect of the ultrafine particles on the martensitic transformation, a modification for the conventional martensitic transformation has been made to interpret the stabilization behavior of the ultrafine gamma-Fe(N) particles. It is indicated that the strengthening of the particles due to the reduction of the particle size and refinement of grain size may play important roles in both inhibiting the homogeneous nucleation and martensitic transformation occurred in the ultrafine particles.
部门归属	tsing hua univ,dept mat sci & engn,beijing 100084,peoples r china.;zhao, xq (reprint author), chinese acad sci,inst met res,natl lab rsa,shenyang 110015,peoples r china
关键词	Ultrafine Particles Particles Size Martensitic Transformation Gamma-fe(n) Thermodynamics Laser Synthesis Size Dependence Powders Metals Alloys Ms
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38497
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Q. Zhao,L. A. Yong,Z. Q. Hu,et al. Thermodynamic interpretation of the martensitic transformation in ultrafine gamma-Fe(N) particles[J]. Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers,1996,35(8):4468-4473.
APA	X. Q. Zhao,L. A. Yong,Z. Q. Hu,&B. X. Liu.(1996).Thermodynamic interpretation of the martensitic transformation in ultrafine gamma-Fe(N) particles.Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers,35(8),4468-4473.
MLA	X. Q. Zhao,et al."Thermodynamic interpretation of the martensitic transformation in ultrafine gamma-Fe(N) particles".Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers 35.8(1996):4468-4473.