The Effect of Initial Grain Size on Formability of AZ31B Magnesium Alloy during I-ECAP
The Effect of Initial Grain Size on Formability of AZ31B Magnesium Alloy during I-ECAP
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DOI：
10.4028/www.scientific.net/kem.611-612.573
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发表时间：
2014-05
期刊：
影响因子：
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通讯作者：
M. Gzyl;A. Rosochowski;L. Olejnik;A. Reshetov
中科院分区：
文献类型：
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作者：
M. Gzyl;A. Rosochowski;L. Olejnik;A. Reshetov
研究了AZ 31 B镁合金在增量等通道转角挤压（I-ECAP）过程中的成形性能。在125 °C至250 °C的温度范围内，使用不同的I-ECAP路线加工方形坯料。坯料从市售的粗晶粒热挤压棒和细晶粒热轧板获得。报道了初始微观结构对加工温度的强烈影响。细粒样品在200 °C下成功加工，而粗粒样品必须加热至250 °C以避免断裂。随着后续道次的逐渐温度降低允许在150 °C下成功压制。使用各种I-ECAP路线的加工表明，在最后道次之前的坯料旋转对机械性能有很大的影响。将实验结果绘制成AZ 31 B镁合金的允许加工温度图。结果表明，I-ECAP变形的最低温度与初始晶粒尺寸的关系可用对数方程描述。
The goal of this work was to investigate formability of AZ31B magnesium alloy during incremental equal channel angular pressing (I-ECAP). Square billets were processed using different routes of I-ECAP at temperatures varying from 125 °C to 250 °C. The billets were obtained from commercially available coarse-grained, hot-extruded rod and fine-grained, hot-rolled plate. A strong influence of the initial microstructure on processing temperature was reported. Fine-grained samples were successfully processed at 200 °C, while coarse-grained ones must have been heated up to 250 °C to avoid fracture. A gradual temperature decrease with subsequent passes allowed successful pressing at 150 °C. Processing using various routes of I-ECAP showed that a billet rotation before the last pass had strong influence on mechanical properties. The results of experiments were plotted on the diagram of allowable processing temperature for AZ31B. It was found that the relation between the minimum temperature in I-ECAP and the initial grain size could be described by a logarithmic equation.