Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature

Unfolding the structure–property linkages between the mechanical performance and microstructural characteristics could be an attractive pathway to develop new single- and polycrystalline Al-based alloys to achieve ambitious high strength and fuel economy goals. A lot of polycrystalline as-cast Al-Cu...

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Autores principales:	Muhammad Farzik Ijaz, Mahmoud S. Soliman, Ahmed S. Alasmari, Adel T. Abbas, Faraz Hussain Hashmi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	as-cast Al-Cu-Mg-Ag alloy Cu/Mg ratio peak aged tensile test mechanical properties Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/e1c7db1044da4cdba45ca83ce7267a2f
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spelling	oai:doaj.org-article:e1c7db1044da4cdba45ca83ce7267a2f2021-11-25T17:18:22ZComparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature10.3390/cryst111113302073-4352https://doaj.org/article/e1c7db1044da4cdba45ca83ce7267a2f2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1330https://doaj.org/toc/2073-4352Unfolding the structure–property linkages between the mechanical performance and microstructural characteristics could be an attractive pathway to develop new single- and polycrystalline Al-based alloys to achieve ambitious high strength and fuel economy goals. A lot of polycrystalline as-cast Al-Cu-Mg-Ag alloy systems fabricated by conventional casting techniques have been reported to date. However, no one has reported a comparison of mechanical and microstructural properties that simultaneously incorporates the effects of both alloy chemistry and mechanical testing environments for the as-cast Al-Cu-Mg-Ag alloy systems. This preliminary prospective paper presents the examined experimental results of two alloys (denoted Alloy 1 and Alloy 2), with constant Cu content of ~3 wt.%, Cu/Mg ratios of 12.60 and 6.30, and a constant Ag of 0.65 wt.%, and correlates the synergistic comparison of mechanical properties at room and elevated temperatures. According to experimental results, the effect of the precipitation state and the mechanical properties showed strong dependence on the composition and testing environments for peak-aged, heat-treated specimens. In the room-temperature mechanical testing scenario, the higher Cu/Mg ratio alloy with Mg content of 0.23 wt.% (Alloy 1) possessed higher ultimate tensile strength when compared to the low Cu/Mg ratio with Mg content of 0.47 wt.% (Alloy 2). From phase constitution analysis, it is inferred that the increase in strength for Alloy 1 under room-temperature tensile testing is mainly ascribable to the small grain size and fine and uniform distribution of θ precipitates, which provided a barrier to slip by deaccelerating the dislocation movement in the room-temperature environment. Meanwhile, Alloy 2 showed significantly less degradation of mechanical strength under high-temperature tensile testing. Indeed, in most cases, low Cu/Mg ratios had a strong influence on the copious precipitation of thermally stable omega phase, which is known to be a major strengthening phase at elevated temperatures in the Al-Cu-Mg-Ag alloying system. Consequently, it is rationally suggested that in the high-temperature testing scenario, the improvement in mechanical and/or thermal stability in the case of the Alloy 2 specimen was mainly due to its compositional design.Muhammad Farzik IjazMahmoud S. SolimanAhmed S. AlasmariAdel T. AbbasFaraz Hussain HashmiMDPI AGarticleas-castAl-Cu-Mg-Ag alloyCu/Mg ratiopeak agedtensile testmechanical propertiesCrystallographyQD901-999ENCrystals, Vol 11, Iss 1330, p 1330 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	as-cast Al-Cu-Mg-Ag alloy Cu/Mg ratio peak aged tensile test mechanical properties Crystallography QD901-999
spellingShingle	as-cast Al-Cu-Mg-Ag alloy Cu/Mg ratio peak aged tensile test mechanical properties Crystallography QD901-999 Muhammad Farzik Ijaz Mahmoud S. Soliman Ahmed S. Alasmari Adel T. Abbas Faraz Hussain Hashmi Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature
description	Unfolding the structure–property linkages between the mechanical performance and microstructural characteristics could be an attractive pathway to develop new single- and polycrystalline Al-based alloys to achieve ambitious high strength and fuel economy goals. A lot of polycrystalline as-cast Al-Cu-Mg-Ag alloy systems fabricated by conventional casting techniques have been reported to date. However, no one has reported a comparison of mechanical and microstructural properties that simultaneously incorporates the effects of both alloy chemistry and mechanical testing environments for the as-cast Al-Cu-Mg-Ag alloy systems. This preliminary prospective paper presents the examined experimental results of two alloys (denoted Alloy 1 and Alloy 2), with constant Cu content of ~3 wt.%, Cu/Mg ratios of 12.60 and 6.30, and a constant Ag of 0.65 wt.%, and correlates the synergistic comparison of mechanical properties at room and elevated temperatures. According to experimental results, the effect of the precipitation state and the mechanical properties showed strong dependence on the composition and testing environments for peak-aged, heat-treated specimens. In the room-temperature mechanical testing scenario, the higher Cu/Mg ratio alloy with Mg content of 0.23 wt.% (Alloy 1) possessed higher ultimate tensile strength when compared to the low Cu/Mg ratio with Mg content of 0.47 wt.% (Alloy 2). From phase constitution analysis, it is inferred that the increase in strength for Alloy 1 under room-temperature tensile testing is mainly ascribable to the small grain size and fine and uniform distribution of θ precipitates, which provided a barrier to slip by deaccelerating the dislocation movement in the room-temperature environment. Meanwhile, Alloy 2 showed significantly less degradation of mechanical strength under high-temperature tensile testing. Indeed, in most cases, low Cu/Mg ratios had a strong influence on the copious precipitation of thermally stable omega phase, which is known to be a major strengthening phase at elevated temperatures in the Al-Cu-Mg-Ag alloying system. Consequently, it is rationally suggested that in the high-temperature testing scenario, the improvement in mechanical and/or thermal stability in the case of the Alloy 2 specimen was mainly due to its compositional design.
format	article
author	Muhammad Farzik Ijaz Mahmoud S. Soliman Ahmed S. Alasmari Adel T. Abbas Faraz Hussain Hashmi
author_facet	Muhammad Farzik Ijaz Mahmoud S. Soliman Ahmed S. Alasmari Adel T. Abbas Faraz Hussain Hashmi
author_sort	Muhammad Farzik Ijaz
title	Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature
title_short	Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature
title_full	Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature
title_fullStr	Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature
title_full_unstemmed	Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature
title_sort	comparison of mechanical and microstructural properties of as-cast al-cu-mg-ag alloys: room temperature vs. high temperature
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e1c7db1044da4cdba45ca83ce7267a2f
work_keys_str_mv	AT muhammadfarzikijaz comparisonofmechanicalandmicrostructuralpropertiesofascastalcumgagalloysroomtemperaturevshightemperature AT mahmoudssoliman comparisonofmechanicalandmicrostructuralpropertiesofascastalcumgagalloysroomtemperaturevshightemperature AT ahmedsalasmari comparisonofmechanicalandmicrostructuralpropertiesofascastalcumgagalloysroomtemperaturevshightemperature AT adeltabbas comparisonofmechanicalandmicrostructuralpropertiesofascastalcumgagalloysroomtemperaturevshightemperature AT farazhussainhashmi comparisonofmechanicalandmicrostructuralpropertiesofascastalcumgagalloysroomtemperaturevshightemperature
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Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature

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