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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Dynamic recrystallization in Al-Mg-Sc alloys
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Dynamic recrystallization in Al-Mg-Sc alloys

机译：Al-Mg-Sc合金中的动态再结晶

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The main research interest was to investigate the mechanisms in the restoration process of Al-3 mass% Mg and Al-3 mass% Mg-0.2 mass% Sc alloy containing second-phase Al_3Sc precipitates. The alloy specimen, Al-3% Mg-0.2% Sc, was peak-aged, where it contained stable coherent, spherical Al_3Sc precipitates with an average diameter of 0.2 μm and a volume fraction of 0.005. The main techniques utilized are compression tests, optical microscopy, the Laue X-ray method, the electron backscattering pattern method using a scanning electron microscopy and transmission electron microscopy (TEM). The observed fluctuation of the stress-strain curves and grain growth during high temperature deformation strongly suggested the occurrence of dynamic recrystallization during hot deformation of the alloy. The transmission Laue method revealed new undeformed spots formed during deformation, which directly shows that new grains have been generated. TEM observation revealed the areas of high dislocation density at the immediate vicinity of the particles in hot deformed conditions. In the ternary alloy (Al-3% Mg-0.2% Sc), dynamic recrystallization seems to occur more frequently than in the binary alloys (Al-3% Mg) through grain boundary bulging. These observations lead to a hypothesis that dynamically recrystallized grains in the present study were nucleated by the combined effects of stress induced grain boundary bulging and preferential hardening at the sites of Al_3Sc precipitates near grain boundaries.
机译：主要研究兴趣是研究含有第二相Al_3Sc析出物的Al-3质量％Mg和Al-3质量％Mg-0.2质量％Sc合金在修复过程中的机理。合金试样Al-3％Mg-0.2％Sc达到峰值时效，其中包含稳定的，连贯的球形Al_3Sc沉淀，平均直径为0.2μm，体积分数为0.005。使用的主要技术是压缩测试，光学显微镜，劳厄X射线法，使用扫描电子显微镜和透射电子显微镜（TEM）的电子反向散射图样方法。在高温变形过程中观察到的应力-应变曲线和晶粒生长的波动强烈暗示了合金热变形过程中动态再结晶的发生。透射劳厄法揭示了在变形过程中形成了新的未变形斑点，这直接表明已经产生了新的晶粒。 TEM观察显示，在热变形条件下，颗粒紧邻区域的位错密度高。在三元合金（Al-3％Mg-0.2％Sc）中，动态再结晶似乎比二元合金（Al-3％Mg）中通过晶界膨胀更频繁地发生。这些观察结果得出这样的假设：在本研究中，动态再结晶晶粒是由应力引起的晶界隆起和在晶界附近的Al_3Sc析出部位的优先硬化的综合作用所形成的。

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