TiZr基非晶/TC21双层复合材料的制备和力学性能

Preparation and Mechanical Properties of TiZr-based Bulk Metallic Glass/TC21 Titanium Alloy Dual-layered Composites

用渗流法制备TiZr基非晶/TC21钛合金双层复合材料,并对其微观组织和力学性能进行深入的研究。结果表明,TiZr基非晶(ZT3,Ti_(32.8)Zr_(30.2)Ni_(5.3)Cu(9)Be_(22.7))合金熔体与TC21钛合金之间的界面结合良好且有良好的润湿性。制备温度对双层复合材料的微观结构和力学性能有极大的影响。随着制备温度的提高,界面层的厚度和TC21钛合金的溶解量增加,非晶基体中枝晶相的体积分数增大、晶粒粗化。这种双层复合材料的强度随着温度的提高而降低,在室温下具有良好的弯曲塑性,其弯曲强度达到2177 MPa、动态压缩强度达到1326 MPa。

Dual-layered composites of TiZr-based bulk metallic glass/TC21 Ti-alloy were successfully prepared by infiltration method,and their microstructure and mechanical property were investigated in detail.The results show that there is a good wettability of ZT3(Ti_(32.8)Zr_(30.2)Ni_(5.3)Cu(9)Be_(22.7))melt with TC21 Ti-alloy,and the as-prepared dual-layered composites show an excellent interfacial bonding between BMGs and TC21 Ti-alloys.The temperature of preparation plays a critical role for the microstructure and mechanical property of the dual-layered composites.With the increasing temperature for preparation,the interfacial layers become thicker moreover,the TC21 Ti-alloy may dissolve increasingly into the BMGs matrix so that the dendrites precipitate significantly increase and they become coarser with the increasing temperature.The dual-layered composites exhibit a satisfied flexural mechanical property,namely a flex-ural strength of 2177 MPa with outstanding flexural plasticity.Additionally,the prepared dual-layered composites show the dynamic compressive strength up to 1326 MPa at ambient temperature,but decreases as the temperature increasing.