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Influence of Omega-Phase Precipitation Hardening on the Static and Dynamic Properties of Metastable Beta Ti-Nb-Zr and Ti-Nb-Ta Alloys

机译:ω相沉淀硬化对亚稳态βTi-Nb-Zr和Ti-Nb-Ta合金静态和动态性能的影响

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摘要

The influence of thermomechanical processing on the Ti-21.8Nb-6Zr (TNZ) and Ti-19.7Nb-5.8Ta (TNT) (at%) alloys' structure, phase composition, mechanical and functional properties is studied. Both alloys possess polygonized dislocation substructure (average subgrain size ~ 100 nm), and manifest superelastic behavior at room temperature and recovery stress generation during constant-strain temperature scanning experiments. After aging treatment, both alloys were co-phase precipitation hardened, but their mechanical behavior was impacted differently -- it was detrimental for TNZ and beneficial for TNT. The different impact of aging heat treatment on the mechanical behavior of these alloys is explained by the differences in the co-phase nucleation rate, precipitates' size, shape, volume fraction and distribution, and by their effect on the alloys' critical stresses and transformation temperatures.
机译:研究了热机械加工对Ti-21.8Nb-6Zr(TNZ)和Ti-19.7Nb-5.8Ta(TNT)(at%)合金的结构,相组成,力学和功能性能的影响。两种合金均具有多边形位错亚结构(平均亚晶粒尺寸〜100 nm),并在室温下表现出超弹性行为,并在恒定应变温度扫描实验中表现出恢复应力的产生。经过时效处理后,两种合金都进行了共相沉淀硬化,但是它们的机械性能受到了不同的影响-对TNZ不利,对TNT有利。时效热处理对这些合金的机械性能的不同影响可以通过共相成核速率,析出物的大小,形状,体积分数和分布以及它们对合金的临界应力和转变的影响来解释。温度。

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