原位内生树枝晶增韧钛基非晶复合材料的组织与性能

Microstructure and Properties of Ti-based BMGC Reinforced by In-situ Endogenetic Dendrite

以(Ti_(40.4)Zr_(27.7)Be_(15.6)Cu_(6.3))_((90+x)/90)Nb_(10-x)(x=0、2、4、6、8、10,%)合金体系为研究对象,制备了4种成分的原位内生β相树枝晶增强钛基非晶复合材料。用XRD、SEM和TEM等手段分析了钛基非晶复合材料的相组成、微观结构以及力学性能和变形行为。结果表明,钛基非晶合金复合材料中的原位内生β相树枝晶的体积分数与尺寸均随Nb含量的增加而增大。拉伸测试结果表明,其屈服强度和抗拉强度随着原位内生β相树枝晶尺寸的增大而降低,但塑性变形能力显著提高。其中,Ti_(40.4)Zr_(27.7)Be_(15.6)Cu_(6.3)Nb_(10)非晶复合材料的屈服强度为1307MPa,抗拉强度为1428MPa,断裂应变为9.61%,表明了钛基非晶复合材料的良好塑性变形能力。

Taking(Ti_(40.4)Zr_(27.7)Be_(15.6)Cu_(63))_((90+x)/90)Nb_(10-x)(x=0,2,4,6,8,10,%)alloy as the research object,four kinds of Ti-based bulk metallic glass composites(BMGCs)reinforced by in-situ endogeneticβ-phase dendrites were prepared.The phase composition,microstructure,mechanical properties and deformation behavior of Tibased BMGCs were systematically analyzed through XRD,SEM and TEM.The results demonstrate that the volume fraction and dimension of the in-situ endogeneticβ-phase dendrites in Ti-based BMGCs are increased with the increase of Nb content.The tensile results reveal that the yield strength and tensile strength of the composites are decreased with increasing dimension of the in-situ endogeneticβ-phase dendrites,contrarily,the plastic deformation ability is enhanced significantly.Among these BMGCs,the mean yield strength,tensile strength and fracture strain of Ti_(40.4)Zr_(27.7)Be_(15.6)Cu_(6.3)Nb_(10)BMGC are 1307MPa,1428MPa and 9.61%,respectively,indicating the excellent plastic deformation ability of the Ti-based BMGC.