Solid-Solution Strengthening and Weakening of Vanadium–Titanium Alloys

E. Pink, R. Arsenault
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引用次数: 16

Abstract

AbstractThe thermal component, τ*, of the macroyield stress has been investigated for vanadium with 0.75, 1.6, 4, and 20 wt.-% titanium. The 4 wt.-% alloy showed a significant weakening effect below 100K. The temperature-dependence of the strain-rate-sensitivity for the alloys is discontinuous and indicates two different deformation mechanisms. At high temperatures a mechanism is operative that has a high H 0 value, i.e. 1.5eV. It is probably a distortion mechanism controlled by titanium atoms in clumps. At low temperatures the double-kink mechanism is rate-controlling. The titanium clumps can aid in the formation of double kinks by producing a torque on the screw dislocation. This torque reduces the τ* necessary for the formation of a double link, and therefore, “alloy weakening” is observed. The results strongly indicate that in relatively pure vanadium (< 50 at.-ppm) the impurity interstitials are not affecting τ*.
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钒钛合金固溶强化与弱化
摘要研究了钛含量为0.75、1.6、4、20 wt.-%时钒合金宏观屈服应力的热分量τ*。4wt .-%合金在100K以下表现出明显的弱化效应。合金的应变率敏感性随温度的变化是不连续的,表现出两种不同的变形机制。在高温下,具有高h0值(即1.5eV)的机制可以工作。这可能是一种由钛原子团块控制的扭曲机制。在低温下,双结机制是速率控制的。钛团块可以通过在螺位错上产生扭矩来帮助形成双扭结。这种扭矩降低了形成双连杆所需的τ*,因此观察到“合金弱化”。结果表明,在相对纯净的钒(< 50 at.-ppm)中,杂质间隙不影响τ*。
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