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本工作对比研究了一个马氏体型α-β钛合金(Ti-6.5Al—3.5Mo—2Zr—0.3Si)三种类型退火组织的机械性能和电子断口相的特征。这三种类型的组织是:等轴组织(等轴初生α体积分数在50%左右)、混合组织(由接近等轴的α颗粒和歪扭的片状α交替排列的组织)和片状组织(片状α+β的魏氏组织+晶界α)。发现在拉伸、冲击、疲劳、500℃长时热暴露后的室温拉伸性能等方面,等轴组织优于另外两种组织,而在500℃的持久强度和蠕变强度方面,则混合组织优于其它两种组织。混合组织具有较好的综合性能。等轴组织和混合组织的电子断口相的特征是韧窝,片状组织的断裂特征则为微孔聚合型的晶间断裂。
In this work, the mechanical properties and the characteristics of the electron-fractured phase of three types of martensite α-β titanium alloy (Ti-6.5Al-3.5Mo-2Zr-0.3Si) The three types of tissue are: the isometric (primary α-volume fraction of isobaric about 50%), the mixed tissue (the tissue with alternating α-grains and crooked plaques α near the equiaxed) (Sheet α + β Wei’s tissue + grain boundary α). It is found that the equiaxed structure is superior to the other two structures in terms of tensile, impact, fatigue, room temperature tensile properties after long-time thermal exposure at 500 ° C., and at 500 ° C. in terms of persistence and creep strength, Better than the other two organizations. Mixed organizations have better overall performance. The electronic fracture surface of equiaxed and mixed structures is characterized by dimples, and the fracture characteristics of platelets are microporous polymeric intergranular fractures.