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Evaluating the Effect of Hot‐Rolling Reduction on the Mechanical Properties of In Situ Formed Aluminum–Magnesium–Silicon (Al‐Mg2Si) Composites
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2019-10-17 , DOI: 10.1002/adem.201900609 Rashadoddin Zamani 1 , Hamed Mirzadeh 1 , Massoud Emamy 1
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2019-10-17 , DOI: 10.1002/adem.201900609 Rashadoddin Zamani 1 , Hamed Mirzadeh 1 , Massoud Emamy 1
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The effects of hot rolling on the microstructure and mechanical properties of as‐cast Al‐15Mg2Si, Al‐20Mg2Si, and modified Al‐15Mg2Si in situ composites are studied. During rolling, the primary and eutectic Mg2Si particles undergo mechanical fragmentation and move along the rolling direction, which results in the enhancement of ductility of the composite compared to the as‐cast state. At high reductions in thickness, however, severely elongated grains and some cracks are observed in the matrix, which are related to the retardation effect of the widely dispersed particles and also fast cooling of sheets during rolling. These effects are found to be responsible for the observed high tensile strength and low ductility of heavily rolled sheets. It is revealed that the strength–ductility balance of the hot‐rolled sheets, as measured by the tensile toughness, is inferior compared to that of the commercially pure Al sheet as the basis for comparison. Therefore, relatively low reductions in thickness are recommended for processing of these composites. The hot extrusion of these composites is also briefly discussed, and it is characterized as a viable route for processing of these composites to achieve high tensile strength with acceptable ductility.
中文翻译：
评估热轧降低对原位形成的铝镁硅（Al-Mg2Si）复合材料的力学性能的影响
研究了热轧对铸态Al-15Mg 2 Si，Al-20Mg 2 Si和改性Al-15Mg 2 Si原位复合材料的组织和力学性能的影响。轧制过程中，初生和共晶Mg 2硅颗粒经历机械破碎并沿轧制方向移动，与铸态相比，这提高了复合材料的延展性。然而，在高厚度减小的情况下，在基体中观察到严重拉长的晶粒和一些裂纹，这与广泛分散的颗粒的阻滞作用以及轧制过程中片材的快速冷却有关。发现这些作用是观察到的重轧板的高拉伸强度和低延展性的原因。结果表明，以拉伸韧性衡量的热轧薄板的强度-延展性平衡不如商业纯铝薄板作为比较基础。因此，建议在加工这些复合材料时相对降低厚度。
更新日期：2019-10-17
中文翻译：
评估热轧降低对原位形成的铝镁硅（Al-Mg2Si）复合材料的力学性能的影响
研究了热轧对铸态Al-15Mg 2 Si，Al-20Mg 2 Si和改性Al-15Mg 2 Si原位复合材料的组织和力学性能的影响。轧制过程中，初生和共晶Mg 2硅颗粒经历机械破碎并沿轧制方向移动，与铸态相比，这提高了复合材料的延展性。然而，在高厚度减小的情况下，在基体中观察到严重拉长的晶粒和一些裂纹，这与广泛分散的颗粒的阻滞作用以及轧制过程中片材的快速冷却有关。发现这些作用是观察到的重轧板的高拉伸强度和低延展性的原因。结果表明，以拉伸韧性衡量的热轧薄板的强度-延展性平衡不如商业纯铝薄板作为比较基础。因此，建议在加工这些复合材料时相对降低厚度。
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