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首页> 外文期刊>Experimental Mechanics >On the Occurrence of Portevin-Le ChA cent telier Instabilities in Ultrafine-Grained 5083 Aluminum Alloys
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On the Occurrence of Portevin-Le ChA cent telier Instabilities in Ultrafine-Grained 5083 Aluminum Alloys

机译：超细晶粒5083铝合金中Portevin-Le ChA中心伸长率不稳定性的发生

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摘要

The Portevin-Le ChA cent telier (PLC) instability is commonly observed in Al-Mg alloys and is manifested in serrated flow within the stress-strain response. We investigate the persistence of this instability with reduction in grain size by studying an ultrafine-grained (ufg) aluminum alloy (Al5083) and a conventional grain size Al5083. Micro-scale tensile tests combined with digital image correlation (DIC) reveal strength anisotropy and heterogeneity of the deformation in the three material directions (extrusion, rolled, and transverse). For the same applied displacement rate, the PLC effect in ufg-Al5083 is observed only over a small strain range immediately following the yield, while the coarse-grained Al5083 exhibits serrated flow over nearly the entire plastic strain range. These observations are explained using the stability analysis of Hahner (Acta Mater 45:3695-3707, 1997), and implications for nanocrystalline (nc) alloys are discussed.
机译：在Al-Mg合金中通常观察到Portevin-Le ChA百分位数（PLC）的不稳定性，并表现为应力应变响应内的锯齿状流动。通过研究超细晶粒（ufg）铝合金（Al5083）和常规晶粒尺寸Al5083，我们研究了这种不稳定性随晶粒尺寸减小的持久性。微型拉伸试验与数字图像相关性（DIC）相结合，揭示了材料在三个材料方向（挤压，轧制和横向）的强度各向异性和变形的异质性。对于相同的施加位移速率，仅在屈服之后立即在很小的应变范围内观察到ufg-Al5083的PLC效应，而粗粒Al5083几乎在整个塑性应变范围内均呈现锯齿状流动。使用Hahner的稳定性分析（Acta Mater 45：3695-3707，1997）解释了这些观察结果，并讨论了对纳米晶（nc）合金的意义。

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