Effects of under-aging treatment on microstructure and mechanical properties of squeeze-cast Al-Zn-Mg-Cu alloy

Wang, Fei-Fan; Meng, W. J.; Zhang, Hongwei; Zhou, Han

doi:10.1016/s1003-6326(18)64837-x

Cited by 21 publications

(8 citation statements)

References 18 publications

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“…Solid solution treatment, known as quenching, is the basis of strengthening heat treatment (quenching and aging) of aluminum alloy strengthened by heat treatment [ 99 ]. Solid solution treatment is classified into single-stage solid solution treatment (SST), enhanced solid solution treatment (EST), high temperature pre-precipitation (HTPP) and multi-stage solid solution treatment (MST) [ 100 , 101 , 102 ]. The objective of solid solution is to dissolve the alloying elements into the aluminum matrix to achieve a well strengthening effect in the subsequent aging precipitation stage.…”

Section: Preparation Methods Of 7xxx Series Aluminum Alloymentioning

confidence: 99%

Review on Micro-Alloying and Preparation Method of 7xxx Series Aluminum Alloys: Progresses and Prospects

2022

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Notably, 7xxx series aluminum alloy has become the most popular nonferrous alloy, extensively used in industry, construction and transportation trades, due to its high comprehensive properties such as high static strength, high strength, heat resistance, high toughness, damage resistance, low density, low quenching sensitivity and rich resource. The biggest challenge for aluminum alloy today is to greatly improve the corrosion resistance of the alloy, while maintaining its strength. The preparation method of 7xxx series aluminum alloy requires controlling time lapses in the process of heating, holding and cooling, and there are many species precipitates in the crystal, but the precipitated strengthening phase is a single type of equilibrium η′ phase. Therefore, more attention should be paid to how to increase the volume fraction of η′ precipitates and modify the comprehensive performance of the material and focus more on the microstructure of the precipitates. This article reviews the progress of 7xxx series aluminum alloy materials in micro-alloying, aging precipitation sequence, the strengthening-toughening mechanism and the preparation method. The effect of adding trace elements to the microstructure and properties of 7xxx series aluminum alloy and the problems existing in aging precipitation characteristics and the reinforcement mechanism are discussed. The future development direction of 7xxx series aluminum alloy is predicted by developing a method for the process-microstructure-property correlation of materials to explore the characteristic microstructure, micro-alloying, controlling alloy microstructure and optimizing heat-treatment technology.

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Section: Preparation Methods Of 7xxx Series Aluminum Alloymentioning

confidence: 99%

Review on Micro-Alloying and Preparation Method of 7xxx Series Aluminum Alloys: Progresses and Prospects

2022

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“…Zang et al [ 5 ] found that the yield and tensile strength of 2124 aluminum alloy plates increased monotonically, while their elongation decreased monotonically with increasing aging time, when aged at 170, 175, and 180 °C. Wang et al [ 6 ] found the tensile and yield strengths of squeeze-cast Al–4.91Zn–1.99Mg–1.5Cu alloy to increase when the aging was extended from 2 h to 8 h at 135 °C, while the elongation decreased. In conclusion, the results of the present study show that the strength of an aluminum alloy first increases and then decreases with increasing aging time, but the corresponding elongation decreases monotonically [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Precipitates on the Mechanical Performance of 7005 Aluminum Alloy Plates

Tian

Zhang

et al. 2022

Materials

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In this study, the strength, elongation, and fatigue properties of 7005 aluminum alloy plates with different configurations of precipitates were investigated by means of tensile tests, fatigue tests, and microstructural observation. We found that the number and size of GP zones in an alloy plate matrix increased and the distribution was more uniform after the aging time was extended from 1 h to 4 h at 120 °C, which led to a rise in both strength and elongation of alloy plates with the extending aging time. The fatigue life of the alloy plates shortened slightly at first, then significantly prolonged, and then shortened again with the aging time extending from 1 h to 192 h and a fatigue stress level of 185 MPa and stress ratio (R) = 0. After aging at 120 °C for 96 h, the precipitates in the alloy plate matrix were almost all metastable η′-phase particles, which had the optimal aging strengthening effect on the alloy matrix, and the degree of mismatch between the α-Al matrix and second-phase particles was the smallest; the fatigue crack initiation and propagation resistances were the largest, leading to the best fatigue performance of alloy plates, and the fatigue life of the aluminum plate was the longest, up to 1.272 ´ 106 cycles. When the aging time at 120 °C was extended to 192 h, there were a small number of equilibrium η phases in the aluminum plates that were completely incoherent with the matrix and destroyed the continuity of the aluminum matrix, easily causing stress concentration. As a result, the fatigue life of alloy plates was shortened to 9.422 ´ 105 cycles.

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“…Однако широкий интервал кристаллизации и склонность к горячеломкости не позволяют получать качественные изделия [2] с использованием простых технологических операций литья. Наилучшие результаты были достигнуты при изготовлении отливок способом штамповки в твердожидком состоянии [13][14][15][16]. Однако, как показано в работах [13,17], сплав системы Al-Zn-Mg-Cu, полученный таким способом, в литом состоянии имеет низкую пластичность, а ее повышение требует обязательной термической обработки.…”

Section: Introductionunclassified

“…Наилучшие результаты были достигнуты при изготовлении отливок способом штамповки в твердожидком состоянии [13][14][15][16]. Однако, как показано в работах [13,17], сплав системы Al-Zn-Mg-Cu, полученный таким способом, в литом состоянии имеет низкую пластичность, а ее повышение требует обязательной термической обработки. Единственный литейный сплав, представленный в ГОСТ 1583-93 и демонстрирующий эту систему, -сплав АЦ4Мг, содержащий до 4,5 % Zn, 2 % Mg и малые добавки марганца и титана.…”

Section: Introductionunclassified

New high-strength casting aluminum alloy based on the Al–Zn–Mg–Ca–Fe system without requirement for heat treatment

Шуркин

Белов

Musin

et al. 2020

Izv.VUZ. Tsvet. Met.

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The paper substantiates the composition and prospects of using high strength Al–Zn–Mg–Ca–Fe casting aluminum alloy without heat treatment based on the study on the structure, technological and mechanical properties. Alloys of the base composition Al–5.5%Zn–1.5%Mg (wt.%) jointly and separately doped with 0.5–1.0 % Ca and 0.5 % Fe were obtained as the objects of research. Standard casting alloys according to GOST 1583-93: AK12M2, AMg6lch, AM4,5Kd were the objects of comparison. A hot tensile test using a cast test bar was conducted to check the tendency to form hot cracks due to hindered contraction. It was shown that separate alloying with calcium and iron does not contribute to the improvement of crack resistance and adversely affects mechanical properties. Combined alloying with 1 % Ca and 0.5 % Fe improves the hot tearing resistance to the level of the AMg6lch alloy properties. This effect is due to calcium-containing phases of eutectic origin formed and a favorable grain structure created that is free from columnar grains. Iron in the alloy structure is bound in compact Al10CaFe2 phase particles as a result of the non-equilibrium crystallization during permanent mold casting. The formation of this phase allowed to reduce the amount of zinc in the (Al, Zn)4Ca phase and mostly retain the (Al) solid solution composition as evidenced by similar hardness values of the Al–5.5%Zn–1.5%Mg base alloy and Al–5.5%Zn–1.5%Mg–1%Ca–0.5%Fe alloy, and the superiority of the values over the hardness of alloys separately alloyed with calcium and iron. Also the cast hardness of the promising alloy more than 20 HV higher than the cast hardness of commercial cast alloys. The new alloy in the as-cast condition exhibited competitive mechanical tensile properties: UTS ~ 310 MPa, YS ~ 210 MPa, El ~ 4 %.

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Effects of under-aging treatment on microstructure and mechanical properties of squeeze-cast Al-Zn-Mg-Cu alloy

Cited by 21 publications

References 18 publications

Review on Micro-Alloying and Preparation Method of 7xxx Series Aluminum Alloys: Progresses and Prospects

Review on Micro-Alloying and Preparation Method of 7xxx Series Aluminum Alloys: Progresses and Prospects

Effect of Precipitates on the Mechanical Performance of 7005 Aluminum Alloy Plates

New high-strength casting aluminum alloy based on the Al–Zn–Mg–Ca–Fe system without requirement for heat treatment

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