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Effect of Major Alloying Element and Aging Heat Treatment Process on Secondary Phase Formation and Micro-harness of Al-Zn-Mg Alloys
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Effect of Major Alloying Element and Aging Heat Treatment Process on Secondary Phase Formation and Micro-harness of Al-Zn-Mg Alloys
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Journal Article
Effect of Major Alloying Element and Aging Heat Treatment Process on Secondary Phase Formation and Micro-harness of Al-Zn-Mg Alloys
2025
Overview
The present investigation is aimed to investigate the effect of ratio of major alloying element Zinc (Zn) and Magnesium (Mg) and aging heat treatment on microstructure formation and micro-hardness properties of Al-Zn-Mg alloys. The Al-Zn-Mg alloys were fabricated through stir casting process by adding 10 weight percent pure Zn plus pure Mg into the molten pure Aluminium (Al). In the experimental work, total five different Zn/Mg ratios (1.06, 1.93, 3.04, 4.07 and 5.08) were taken to investigate the effect of wt.% concentration of Zinc and Magnesium alloying elements on the micrographs and micro-hardness of A-Zn-Mg alloys. All samples were fabricated by stir casting machine of bottom pouring type. The fabricated specimens were further heat treated by aging heat treatment process. Micrographs of fabricated AL-Zn-Mg alloys were observed by inverted metallurgical microscope. Micro-hardness of both before and after aging condition Al-Zn-Mg alloys were measured by semi-automatic micro-hardness tester. It is interestingly observed that in case of before aging condition the fish skeleton type secondary phases are formed and distributed at the grain boundaries of fabricated alloys irrespective of Zn/Mg ratios; however, the density of secondary phases increases with increase of Zn/Mg ratio up-to a certain value keeping wt.% of Zn plus Mg constant in every specimen. Such secondary phases are dissolved in the Al matrix when the Al-Zn-Mg alloys further processed through aging heat treatment. It is observed that the average hardness of Al-Zn-Mg alloys increases with increase of Zn/Mg ratio up-to a certain value then decreases. It is also interestingly observed that the microhardness increases with further heat treatment of fabricated alloys by aging process and it reaches maximum five times of the pure Aluminium. Such observation of micro-hardness properties of Al-Zn-Mg alloys under both before and after aging conditions is consistent with their microstructure and SEM observation.
Publisher
IOP Publishing
Subject
