机械合金化制备的Fe_(1-x)Ni_x合金纳米晶粉末的形貌和微结构  

The Morphology and Microstructure of Nanocrystalline Fe_(1-x)Ni_x Alloy Powders by Mechanical Alloying

作　　者：王锦辉[1] 朱如扬[2] 陈允鸿[2] 王健[2] 都有为[1] 

机构地区：[1]南京大学物理系,江苏南京210093 [2]扬州大学物理系,江苏扬州225002

出　　处：《功能材料》2000年第1期45-47,共3页Journal of Functional Materials

摘　　要：利用机械合金化方法制备了Fe1-xNix 合金纳米晶粉末 ,x分别为 0 .15、0 .45、0 .80 ,球磨时间为 2、4、8、16、40h。利用扫描电子显微镜和X射线分析仪观察和分析了样品的形貌和微结构。发现整个球磨过程可分为 3个阶段。开始阶段 ,由于冷焊 ,Fe、Ni混合粉末凝聚成一些粒径较大的颗粒 ;在中间阶段 ,内应力达到最大值 ,原先形成的大颗粒破碎 ,粒径分布变窄 ;最后阶段 ,FeNi粉完全合金化 ,粒度再次增大。至 40h时 ,可观察到层状结构。x =0 .15样品40h时形成了体心立方结构 ,而x =0 .45和 0 .80分别在 40h和 16h形成了面心立方结构。x =0 .45系列 40h以后晶粒平均粒径约为10nm ,内应力在 16h时有一极大值 0 .76 % ,在整个球磨过程中 ,测定的Ni含量偏离不超过 3 % (原子分数 )。Fe 1- x Ni x nanocrystalline powders were prepared by mechanical alloying,x is nominally 0.15,0.45,0.80 and milling time is 2,4,8,16,40 hours,respectively.SEM and XRD were employed to study the morphology and microstructure.It is found that the process of ball milling can be divided into three stages.At the early stage,element Fe and Ni particles form some large composite particles due to cold welding,at intermediate stage,the strain reach maximum value,and the composite particles rupture,the range of size become narrower,at last stage,Fe,Ni powders have completely alloyed and size builds up.Layer structure has been observed at 40h.As-milled sample(x =0.15) forms b.c.c.structure after 40h,whereas the samples (x =0.45 and 0.80) form f.c.c. structure at 40 and 16h,alternatively.As for x =0.45,the average grain size is 10nm or so after 40h milling,and the internal strain reach maximum value 0.76% at 16h.In the whole time,the deviation of Ni content is less than 3 at %.

关 键 词：机械合金化 FeNi合金 纳米晶粉末 形貌 微结构 

分 类 号：TM271.2[一般工业技术—材料科学与工程] TF125.8[电气工程—电工理论与新技术]