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<p>The present research work focused to study the effect of major alloying elements on the formation of microstructure including secondary phases and mechanical properties of two different AA7075 and AA6061 alloys and their composites. Both AA7075 and AA6061 alloys were used as the raw materials, and different weight percentages of alloying elements like zinc (Zn) and magnesium (Mg) were added at 1:1, 2:1 and 3:1 ratio with the raw material. Furthermore, the modified aluminum alloys were used again as matrix materials for the fabrication of aluminum alloy matrix composites (AAMCs) by adding different weight percentages of silicon carbide (SiC) as a reinforcement material. Two different modified alloys and AAMCs were fabricated through a casting process by using stir casting machine (SwamEquip; SCM-Al01). XRD, SEM and EDS analyses of modified Al alloys and their composites were carried out. Microstructures of modified Al alloys and AAMCs were observed using an inverted metallurgical microscope, and the grain sizes were measured by following ASTM standards. Hardness tests of fabricated specimens were carried out using Vickers micro-hardness testers, and hardness values were measured using the integrated software. It is observed that equiaxed type grain structures are formed for both the modified Al alloys and their composites indicating the successful fabrication through casting process; however, average grain sizes of fabricated specimens are dependent on the combination of wt.% reinforcement and composition of Al alloys. It also observed a positive correlation with the weight percent ratio of Zn and Mg in AA7075 alloys with the average hardness and tensile strength. But interestingly in case of AA6061 alloys the increment of Zn/Mg ratio negatively effect on average hardness and tensile strength. It is also observed that average hardness of AAMCs fabricated from both modified alloys exhibits consistent improvement with increasing weight fraction of SiC reinforcement irrespective of the weight percent ratio of Zn and Mg combination employed.</p>

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Comparative Investigation of Zn and Mg Additions on Microstructure Evaluation and Mechanical Properties of Modified AA7075 and AA6061 Alloys and Their SiC-Reinforced Stir-Cast Composites

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Prachi Mittal,
  • Ishu Verma,
  • Mukesh Jewariya,
  • Amit Tomar,
  • Jayanta Kumar Mahato

摘要

The present research work focused to study the effect of major alloying elements on the formation of microstructure including secondary phases and mechanical properties of two different AA7075 and AA6061 alloys and their composites. Both AA7075 and AA6061 alloys were used as the raw materials, and different weight percentages of alloying elements like zinc (Zn) and magnesium (Mg) were added at 1:1, 2:1 and 3:1 ratio with the raw material. Furthermore, the modified aluminum alloys were used again as matrix materials for the fabrication of aluminum alloy matrix composites (AAMCs) by adding different weight percentages of silicon carbide (SiC) as a reinforcement material. Two different modified alloys and AAMCs were fabricated through a casting process by using stir casting machine (SwamEquip; SCM-Al01). XRD, SEM and EDS analyses of modified Al alloys and their composites were carried out. Microstructures of modified Al alloys and AAMCs were observed using an inverted metallurgical microscope, and the grain sizes were measured by following ASTM standards. Hardness tests of fabricated specimens were carried out using Vickers micro-hardness testers, and hardness values were measured using the integrated software. It is observed that equiaxed type grain structures are formed for both the modified Al alloys and their composites indicating the successful fabrication through casting process; however, average grain sizes of fabricated specimens are dependent on the combination of wt.% reinforcement and composition of Al alloys. It also observed a positive correlation with the weight percent ratio of Zn and Mg in AA7075 alloys with the average hardness and tensile strength. But interestingly in case of AA6061 alloys the increment of Zn/Mg ratio negatively effect on average hardness and tensile strength. It is also observed that average hardness of AAMCs fabricated from both modified alloys exhibits consistent improvement with increasing weight fraction of SiC reinforcement irrespective of the weight percent ratio of Zn and Mg combination employed.