定向凝固法制备非晶基自生复合材料初步研究  

Study of Metallic Glass Matrix In-Situ Composite Prepared by Undirectional Solidification Method

作　　者：寇生中[1] 高忙忙[1] 赵吉鹏[1] 屠鹏[1] 丁雨田[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室

出　　处：《铸造》2008年第6期557-560,共4页Foundry

基　　金：国家自然科学基金(50371016)

摘　　要：定向凝固技术可使材料凝固组织按特定方向排列,获得定向及单晶组织结构,大大改善材料的力学和物理性能。在大温度梯度的宽调频电磁成形定向凝固设备上,制备出了不同拉拔速度的合金试样,对其微观组织及显微硬度进行了分析。研究表明:在温度梯度一定的情况下,随拉拔速度的增加,合金组织得到了细化,并由胞状晶向树枝晶再向颗粒弥散状分布组织演化,制备出了内生枝晶增强非晶基自生复合材料和微米晶相增强的非晶基自生复合材料。Directional solidification technique permits materials to grow along a specific orientation, in order to obtain the directional or single crystal structure that can improve significantly the mechanical and physical properties of the materials. The samples were prepared on unidirectional solidification apparatus with big temperature gradient and at different drawing speed, and the microstructure and micro-hardness were analyzed. Results showed that the microstructure of the alloy was refined with the increasing of drawing speed at the fixed temperature gradient, and evolved from cellular to dendritic and then particle dispersed distribution microstructure. Therefore the metallic glass matrix in-situ composites were prepared that reinforced by dendrite and micron crystal, respectively.

关 键 词：定向凝固 非晶基复合材料 微观组织 

分 类 号：TB33[一般工业技术—材料科学与工程]