Fe(N)纳米微粒的马氏体相变  

MARTENSITIC TRANSFORMATIONS OF Fe(N) NANOPARTICLES

作　　者：赵新清[1] 黎业生[2] 梁勇[3] 胡壮麒[3] 

机构地区：[1]北京航空材料研究院,北京100095 [2]南方冶金学院材料工程系,赣州341000 [3]中国科学院金属研究所,沈阳110016

出　　处：《金属学报》2002年第1期11-16,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金 50071037;国家航空自然科学基金98G21002资助项目

摘　　要：采用激光热解法制备了单相 γ—Ｆｅ（Ｎ）纳米微粒（Ｎ含量（原子分数）为 ５．９％）并研究了微粒的马氏体相变特征 ．结果表明、纳米微粒的马氏体相变温度远低于相同成分的块体材料． 探讨了微粒尺寸影响用变温度的机理．认为表面应力导致的附加压应力是纳米微粒马氏体相变温度降低的重要原因 采用高压压结（０．５—４．０ ＧＰａ）导致微粒的塑性变形、从而诱发马氏体相变．研究了高压压结对纳米微粒的马氏体相变以及微结构的影响．gamma-Fe(N) nanoparticles (containing 5.9%N, atomic fraction) were prepared by laser induced pyrolysis, and the martensitic transformation characteristics of the nanoparticles was studied. It is found that the martensitic transformation temperature of the nanoparticles is much lower than that of the bulk materials with the same composition. The effect of particle size on the transformation temperature was discussed. It is suggested that the hydrostatic pressure resulting from surface tension of the nanoparticles is responsible for the decrease of the transformation temperature. In order to verify the plastic deformation induced martensitic transformation of the gamma-Fe(N) nanoparticles, the pressurization (0.5-4.0 GPa) method was adopted, and the effect of pressurization on the martensitic transformation and microstructures of the particles were also presented.

关 键 词：纳米粒子 马氏体相变 铁 高压压结 

分 类 号：TG111.5[金属学及工艺—物理冶金]