亚稳态Fe_(0.5-x)Co_xCu_(0.5)纳米晶粉末的微观结构研究

Microstructure of Nanocrystalline Fe_(0.5-x)Co_xCu_(0.5) Alloy Powders by Mechanical Alloying

利用机械合金化方法制备了 Fe0 .5- x Cox Cu0 .5(x=0 ,0 .1 ,0 .2 ,0 .3,0 .4 ,0 .5 )系列合金材料 ,采用X射线衍射和 DSC方法对不同组分的样品进行了测试和分析 ,将 XRD的分析结果与 DSC测量结果进行了比较 ,并从 γ相转变温度的角度对微观结构进行了研究 .结果表明 ,球磨 6 0 h后可以得到以 Cu为基的 fcc的均相结构 ,合金粉末的晶粒尺寸、均方根内应力和均缺陷密度与组分的关系不大 ,晶格常数与组分的关系很大 ,Co0 .5Cu0 .5样品的晶格常数比纯 Cu的小 .合金样品的组分和微观结构对 γ相的转变温度和放热焓有很大影响 .

A series of Fe 0.5-xCo xCu 0.5 alloys were obtained by mechanical alloying with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5. The microstructure of the samples with different milling times were measured and analyzed by the methods of XRD and DSC considering the transition temperature of γ phase. The results showed that the fcc phases of Fe 0.5-xCo xCu 0.5 alloys for different compositions had been obtained under \{60 h\} milling. The average grain size, the average square root of second strain and the average value of the dislocation density of Fe 0.3Co 0.2Cu 0.5 alloy powders had a little relationship with the composition. For \{Co 0.5Cu 0.5\}, the lattice parameter is smaller than that of pure Cu. The composition and microstructure of the samples with the same milling have a lot of effects on the transition temperature of γ phase and exothermic enthalpy.