Bridgman法制备塑性钛基轻质非晶复合材料  

SYNTHESIS OF PLASTIC LIGHTWEIGHT Ti-BASED METALLIC-GLASS-MATRIX COMPOSITES BY BRIDGMAN SOLIDIFICATION

作　　者：张建庭[1] 乔珺威[1] 张勇[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《金属学报》2011年第2期236-240,共5页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展计划资助项目2007CB613903~~

摘　　要：通过Bridgman定向凝固法成功制备了内生枝晶增塑的轻质钛基非晶复合材料.与传统的Cu模吸铸法相比,Bridgman法有效消除了铸态组织中的孔洞,得到了更均匀的微观组织,且能通过调节抽拉速度来控制枝晶相的尺寸和分布,进而优化其力学性能.当抽拉速度为1.4 mm/s时,合金压缩屈服强度、断裂强度和断裂塑性分别达到1956 MPa,2706 MPa和18.0%,且有明显的加工硬化现象.进一步讨论了枝晶跨越长度L和枝晶间距S与力学性能的关系,发现L在约40μm时对材料的塑性贡献最大.A series of lightweight Tibased ductile in-situ dendrite reinforced metallic glass matrix composites were synthesized by Bridgman solidification. Compared to Cu mould suction cast- ing, theβ-Ti dendrites were uniformly distributed within the glass matrix by this method. Through tailoring the withdrawal velocity, the vohlme fraction and the characteristic spanning length of den- drites could be changed, which provides a way to optimize the mechanical properties of the composites. The Ti based composite with excellent, mechanical performances （high ultimate strength of 2706 MPa and large plasticity of 18.0% with apparent work hardening behavior） was synthesized when the withdrawal velocity was fixed at 1.4 mm/s. Tile relationship between the size of the dendrites and the nmchanical properties was investigated, and were obtained when the size of the dendrited it was found that the improved mechanical properties approached about 40 μm.

关 键 词：大块非晶 定向凝固 钛基非晶复合材料 力学性能 

分 类 号：TF777.1[冶金工程—钢铁冶金]