原位过共晶Al-Mg2Si复合材料的组织演变与力学性能

R. Bhandari, M. Mallik, M. Mondal
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引用次数: 5

摘要

在本研究中,利用商业纯Al, Si和Mg金属,通过重力铸造技术开发了原位过共晶Al-X wt. %Mg2Si (X= 15,20,25和30)复合材料。该复合材料由三个相组成,即在凝固过程中被基体(α-Al)吞没的伪共晶转变过程中形成的初生Mg2Si相和二元共晶(Al-Mg2Si)相。研究了复合材料的显微组织评价和力学性能。结果表明,Mg2Si浓度的变化不仅对相的形貌和体积分数有很大影响,而且对所有相的硬度也有很大影响。随着Mg2Si浓度的增加,Mg2Si颗粒的尺寸和体积百分比增大。体硬度随Mg2Si浓度的增加而增加。随着Mg2Si浓度的增加,增强体(初生Mg2Si)的显微硬度略有下降,这是由于增强体的致密性降低所致。相反,其他相的显微硬度随Mg2Si浓度的升高而逐渐升高。在Mg2Si浓度接近伪共晶(13.9 wt. %)区域的样品中,获得了较高的质量指数、伸长率、极限抗拉强度和韧性。当Mg2Si浓度达到25 wt. %时,屈服强度呈上升趋势,当Mg2Si浓度达到30 wt. %时,屈服强度呈下降趋势。在本研究中,利用商业纯Al, Si和Mg金属,通过重力铸造技术开发了原位过共晶Al-X wt. %Mg2Si (X= 15,20,25和30)复合材料。该复合材料由三个相组成,即在凝固过程中被基体(α-Al)吞没的伪共晶转变过程中形成的初生Mg2Si相和二元共晶(Al-Mg2Si)相。研究了复合材料的显微组织评价和力学性能。结果表明,Mg2Si浓度的变化不仅对相的形貌和体积分数有很大影响,而且对所有相的硬度也有很大影响。随着Mg2Si浓度的增加,Mg2Si颗粒的尺寸和体积百分比增大。体硬度随Mg2Si浓度的增加而增加。随着Mg2Si浓度的增加,增强体(初生Mg2Si)颗粒的显微硬度略有下降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructure evolution and mechanical properties of in situ hypereutectic Al-Mg2Si composites
In this investigation, the hypereutectic in-situ Al-X wt. %Mg2Si (X=15, 20, 25 and 30) composites have been developed through gravity casting technique with the use of commercially pure Al, Si and Mg metals. This composite comprises of three phases, namely the primary Mg2Si phase, which is formed during the pseudo-eutectic transformation at the time of solidification engulfed by the matrix (α-Al) and the binary eutectic (Al-Mg2Si) phase. Microstructure evaluation and the mechanical properties of these composites has been investigated. It is observed that the change Mg2Si concentration has a great impression not only on the morphology and volume fraction but also in the hardness of all the phases that exist. The size and volume percentage of Mg2Si particle increases with the increase in Mg2Si concentration. Bulk hardness also increases with higher Mg2Si concentration. The micro hardness of the reinforcement (primary Mg2Si) particle decreased slightly with the increase in the Mg2Si concentration due to the less compact particle. On the contrary, the micro hardness of the other phases showed a gradual rise with the rise in Mg2Si concentration. The higher values of Quality Index, % elongation, ultimate tensile strength and toughness are achieved in the samples where the Mg2Si concentration is nearer to the pseudo-eutectic (13.9 wt. %) region. The yield strength, firstly shows a rising trend up to 25 wt. % Mg2Si and then decreases at 30 wt. % Mg2Si concentration.In this investigation, the hypereutectic in-situ Al-X wt. %Mg2Si (X=15, 20, 25 and 30) composites have been developed through gravity casting technique with the use of commercially pure Al, Si and Mg metals. This composite comprises of three phases, namely the primary Mg2Si phase, which is formed during the pseudo-eutectic transformation at the time of solidification engulfed by the matrix (α-Al) and the binary eutectic (Al-Mg2Si) phase. Microstructure evaluation and the mechanical properties of these composites has been investigated. It is observed that the change Mg2Si concentration has a great impression not only on the morphology and volume fraction but also in the hardness of all the phases that exist. The size and volume percentage of Mg2Si particle increases with the increase in Mg2Si concentration. Bulk hardness also increases with higher Mg2Si concentration. The micro hardness of the reinforcement (primary Mg2Si) particle decreased slightly with the increase in the Mg2Si concentration due to the ...
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