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首页> 外文期刊>Journal of Materials Engineering and Performance >Analysis of Plastic Flow Instability During Superplastic Deformation of the Zn-Al Eutectoid Alloy Modified with 2 wt.% Cu
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Analysis of Plastic Flow Instability During Superplastic Deformation of the Zn-Al Eutectoid Alloy Modified with 2 wt.% Cu

机译：用2重量％改性Zn-Al eutectoid合金的超塑性变形期间塑性流动不稳定性分析。％Cu

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摘要

The aim of this work is to analyze the plastic flow instability in Zn-21Al-2Cu alloy deformed under 10(-3) s(-1) and 513 K, which are optimum conditions for inducing superplastic behavior in this alloy. An evaluation using the Hart and Wilkinson-Caceres criteria showed that the limited stability of plastic flow observed in this alloy is related to low values of the strain-rate sensitivity index (m) and the strain-hardening coefficient (gamma), combined with the tendency of these parameters to decrease depending on true strain (epsilon). The reduction in m and gamma values could be associated with the early onset of plastic instability and with microstructural changes observed as function of the strain. Grain growth induced by deformation seems to be important during the first stage of deformation of this alloy. However, when epsilon > 0.4 this growth is accompanied by other microstructural rearrangements. These results suggest that in this alloy, a grain boundary sliding mechanism acts to allow a steady superplastic flow only for epsilon < 0.4. For epsilon values between 0.4 and 0.7, observed occurrences of microstructural changes and severe neck formation lead to the supposition that there is a transition in the deformation mechanism. These changes are more evident when epsilon > 0.7 as another mechanism is thought to take over.
机译：该工作的目的是分析Zn-21Al-2Cu合金中的塑性流量不稳定性，其在10（-3）S（-1）和513K下变形，这是诱导该合金中的超塑性行为的最佳条件。使用HART和WILKINSON-CACERES的评估表明，在该合金中观察到的塑性流动稳定性有限与应变率敏感性指数（m）的低值和应变硬化系数（γ）与这些参数的趋势根据真菌（epsilon）减少。 M和γ值的还原可以与塑料不稳定性的早期发作相关，并且随着菌株的函数观察到的微观结构变化。变形诱导的晶粒生长似乎在该合金的变形的第一阶段是重要的。然而，当Epsilon> 0.4时，这种生长伴随着其他微观结构重排。这些结果表明，在这种合金中，晶界滑动机构起到仅适用于EPSILON <0.4的稳定超塑性流动。对于0.4至0.7之间的ε值，观察到的微观结构变化和严重的颈部形成导致假定在变形机构中存在过渡。当Epsilon> 0.7被认为接管时，这些变化更加明显。

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