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Journal ArticleDOI

Mechanical Properties and Formability of Heat-Treated 7000-Series High-Strength Aluminum Alloy: Experiments and Finite Element Modeling

01 May 2020-Metals and Materials International (The Korean Institute of Metals and Materials)-Vol. 26, Iss: 5, pp 682-694
TL;DR: In this article, the feasibility of room-temperature (cold) forming of peak-aged 7075 high-strength aluminum alloy (7075-T6) sheets after solution heat treatment followed by water quenching was investigated.
Abstract: The feasibility of room-temperature (cold) forming of peak-aged 7075 high-strength aluminum alloy (7075-T6) sheets after solution heat treatment followed by water quenching was investigated. The anisotropic plastic properties of the heat-treated aluminum sheet (7075-WT) were experimentally characterized by performing uniaxial tensile tests (along different loading directions) and a balanced biaxial tension test. Limit dome height (LDH) and cylindrical cup drawing experiments were conducted to evaluate the formability at room temperature. With the obtained anisotropic mechanical properties, different yield functions, including Yld2000-2d, Hill 1948, and von-Mises, were determined and implemented in the finite element simulations to numerically predict the formability at room temperature. The formability of the 7075-WT sheet at room temperature could be significantly enhanced owing to the prior heat treatment, and the finite element simulations performed using the anisotropic yield functions and Voce hardening law were in good agreement with the measured LDH. The LDH of the 7075-WT sheet in the plane strain and biaxial stress modes and the earing in the circular cup drawing tests could be better predicted non-quadratic Yld2000-2d function than those by isotropic and Hill 1948 quadratic yield functions.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the formability and springback properties of W-tempered 7075 aluminum alloys were analyzed using the Marciniak-Kuczyinski forming limit diagram and U-draw bending springback simulations.

62 citations

Journal ArticleDOI
TL;DR: In this article, the effect of W-temper heat treatment, consisting of solution heat treatment (SHT) and rapid cooling, on the mechanical properties and fracture of high strength aluminum alloy 7075 sheet is investigated experimentally and numerically.

26 citations

Journal ArticleDOI
TL;DR: A review of the development of cast aluminium alloy with highlights on improvement in the morphological, mechanical, tribological, and ageing properties of Sr modified Al-Si and Al−Si-Mg alloys is presented in this article.
Abstract: The present article reviews the development of cast aluminium alloy with highlights on improvement in the morphological, mechanical, tribological, and ageing properties of Sr modified Al–Si and Al–Si–Mg alloys. Aluminium and its alloys find application in the automobile and aviation industries. The main objective of utilizing aluminium alloys for structural application, manufacturing of pistons and engine block for automobile industries is its lightweight and low density. However, the low hardness of these alloys results in a high wear rate. The main factor that affects the properties of aluminium alloys is its microstructure, morphological behaviour, size of the grain and phase distribution. The morphological modification for these alloys is done through different processing techniques like casting, heat treatment, solutionising, and alloying element addition which augments the mechanical, corrosion, and tribological behaviour of these alloys. Of the alloying element additions Sr has proved to a very effective modifier for the alloy, and hence the method of modification was studied in detail. The unwanted effects especially porosity, being one of the main factors for failure of components, were investigated and methods to reduce it according to many researchers were included. Reinforcing the aluminium matrix with ceramic particles and surface modification also enhances the properties of aluminium alloys. The current article reviews the recent techniques to augment the microstructure, value of hardness, tensile properties, tribological properties, and corrosion behaviour of cast Al–Si and Al–Si–Mg alloys by the addition of strontium. Moreover, this review also focuses on the future scope of these aluminium alloys for structural application in automobile and lightweight industries.

15 citations

Journal ArticleDOI
TL;DR: In this article, the yield behavior of 7075 aluminum alloy in T6 temper (AA7075-T6) within the temperature ranging from 25°C to 230°C was investigated.
Abstract: Aluminum alloys have drawn considerable attention in the area of automotive lightweight. High strength aluminum alloys are usually deformed at elevated temperatures due to their poor formability at room temperature. In this work, the yield behavior of 7075 aluminum alloy in T6 temper (AA7075-T6) within the temperature ranging from 25 °C to 230 °C was investigated. Uniaxial and biaxial tensile tests with the aid of induction heating system were performed to determine the stress vs. strain curves and the yield loci of AA7075-T6 at elevated temperatures, respectively. Von Mises, Hill48 and Yld2000-2d yield criteria were applied to predicting yield loci which were compared with experimentally measured yield loci of the AA7075-T6. Results show that yield stress corresponding to the same equivalent plastic strain decreases with increasing temperature within the investigated temperature range and the shape of yield loci evolves nearly negligibly. The experimental yield locus expands with an increase of equivalent plastic strain at the same temperature and the work hardening rate of AA7075-T6 exhibits obvious stress-state-dependency. The non-quadratic Yld2000-2d yield criterion describes the yield surfaces of AA7075-T6 more accurately than the quadratic von Mises and Hill48 yield criteria, and an exponent of 14 in the Yld2000-2d yield function gives the optimal predictions for the AA7075-T6 at all investigated temperatures.

13 citations

References
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