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Effect of Li addition on the plastic deformation behaviour of AZ31 magnesium alloy

机译：锂的添加对AZ31镁合金塑性变形行为的影响

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摘要

The enhancement in the workability, if any, of a dilute Mg alloy, AZ31, with the Li addition is investigated by examining the hot deformation behaviour of AZ31 alloyed with 1, 3 and 5 wt% Li. Compression tests were conducted in the temperature, T, range of 150-400 ℃ and strain rates, ε, ranging from 10~(-3) to 10~(+2) s~(-1). Experimental results show that the deformation behaviour can be divided into three T regimes. In the low T regime (150-200 ℃), an increase in the Li content in AZ31 decreases the twin density with a concomitant enhancement in the non-basal or cross-slip activity. While high Li alloys exhibit low flow stress at low ε in this regime, an increase in ε increases strain hardening rate and twinning activity. Flow localization and shear band formation were observed in most of the alloys in this regime. Deformation in the intermediate T regime (250-300 ℃) leads to dynamic recovery (DRY) at low ε and dynamic re-crystallization (DRX) at high ε, which are the softening mechanisms in Li containing alloys. In high T regime (350-400 ℃), these alloys exhibit softening mechanisms similar to intermediate T regime but high Li alloys surprisingly exhibit higher flow stresses, which is attributed to the higher amount of Li in the solid solution, a result of the dissolution of Li containing precipitates. Non-basal slip and twinning at high ε occur uniformly with homogeneous DRX. A low activation energy for deformation of high Li alloys indicates that the Friedel-Escaig (F-E) mechanism as the rate controlling deformation mechanism. The onset of twinning was examined by the appearance of first local maxima before peak strain in (d~2σ/dε~2) vs. ε curves. Mechanisms responsible for the dependence of critical stress for the onset of DRX on T and ε are also discussed.
机译：通过检查掺有1、3和5 wt％Li的AZ31的热变形行为，研究了添加Li的稀Mg合金AZ31的可加工性的提高。在150-400℃的温度T和10〜（-3）到10〜（+2）s〜（-1）的应变率ε下进行压缩测试。实验结果表明，变形行为可分为三个T型态。在低T态（150-200℃）下，AZ31中Li含量的增加会降低孪晶密度，并同时增强非基层或横向滑移活性。虽然高Li合金在这种情况下在低ε时表现出较低的流应力，但ε的增加会提高应变硬化速率和孪晶活性。在这种状态下，大多数合金中都观察到了流动局部化和剪切带形成。中间T态（250-300℃）的变形导致低ε下的动态回复（DRY）和高ε下的动态再结晶（DRX），这是含锂合金的软化机理。在高T态（350-400℃）下，这些合金表现出类似于中间T态的软化机理，但高Li合金出人意料地表现出更高的流动应力，这归因于固溶体中较高的Li含量，这是溶解的结果。含锂的沉淀。非基面滑动和高ε孪生与均质DRX均匀发生。高Li合金变形的低活化能表明，Friedel-Escaig（F-E）机制是控制速率的变形机制。通过在（d〜2σ/dε〜2）-ε曲线中的峰值应变之前出现的第一个局部最大值来检查孪生的发生。还讨论了引起DRX的临界应力依赖于T和ε的机制。

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