机械合金化+热压制备Cr-NbCr_2复合材料及其组织性能研究  

Study on Microstructure and Properties of Cr-NbCr_2 Composite Material Prepared by Compound Method of Mechanical Alloying + Hot Pressing

作　　者：胡平[1] 鲁世强[1] 肖璇[1] 黄铭刚[1] 

机构地区：[1]南昌航空工业学院材料科学与工程学院,江西南昌330063

出　　处：《热加工工艺》2007年第4期4-6,51,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(50474009);航空科学基金资助项目(05G56003);江西省自然科学基金资助项目(0350045);江西省材料科学与工程研究中心基金资助项目(ZX200401001)

摘　　要：采用机械合金化(MA)+热压工艺路线来制备Cr-NbCr2复合材料。研究了Cr-NbCr2复合材料的组织和性能。结果表明,MA+热压获得的Cr-NbCr2复合材料组织均匀,晶粒尺寸达到微/纳米级,致密度达到98.3%,抗压强度为2044MPa,塑性应变为7.26%,比熔铸法制备的Cr-NbCr2复合材料及单一Laves相(NbCr2)的塑性都有很大提高,充分体现了MA+热压复合工艺对第二相增韧的效果。Cr-NbCr2 composite material was prepared by mechanical alloying （MA） ＋ hot pressing. Its mierostructure and properties were investigated. The results show that the microstructure of Cr-NbCr2 composite material is homogeneous and the grain size is up to the grade of micron/nano-metre.Moreover, the relative density of the material is 98.3% , compressive strength is 2 044 MPa and plasticity strain is 7.26%. Compared with Cr-NbCr2 composite material prepared by arc-melting and simple Laves phase NbCr2, its plasticity increases greatly, the effect of MA ＋ hot pressing compound process of secondary phase toughening has been fully realized.

关 键 词：机械合金化 第二相增韧Cr-NbCr2 组织与性能 

分 类 号：TF123.1[冶金工程—粉末冶金] TF124.37[冶金工程—冶金物理化学]