Journal ArticleDOI
Mechanical Properties and Formability of Heat-Treated 7000-Series High-Strength Aluminum Alloy: Experiments and Finite Element Modeling
TLDR
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.read more
Citations
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Journal ArticleDOI
Damage and failure characterization of 7075 aluminum alloy hot stamping
Journal ArticleDOI
Effect of Heat Treatment on the Microstructure and Properties of High Strain Rate Rolled 7050 Aluminum Alloy
TL;DR: In this article, the authors developed a high strain rate rolling (HSRR) method to improve the strength, plasticity and stress corrosion resistance of 7050 aluminum alloy simultaneously, and the volume fraction of the small-angle grain boundary in the HSRRed alloy sheet is 89.9%.
Journal ArticleDOI
Effect of Dissolution of η′ Precipitates on Mechanical Properties of A7075-T6 Alloy
TL;DR: In this article , the effects of dissolution of the η′ phase by solution treatment on the mechanical properties of A7075-T6 alloy were investigated and the effect of dissolution on the yield strength was shown.
Book ChapterDOI
Formability Improvements of AA5754-H32 at Room Temperature via Continuous Bending Under Tension (CBT) and Pre-forming Heat Treatment
Jinjin Ha,Antonio Piccininni,Yannis P. Korkolis,Gianfranco Palumbo,Marko Knezevic,Brad L. Kinsey +5 more
TL;DR: In this article, the combination of CBT and pre-forming heat treatment was investigated to improve the formability at room temperature of a strain-hardenable 5xxx Al alloy, AA5754-H32.
Journal ArticleDOI
Effect of deep cryogenic treatment on corrosion resistance of AA7075-RRA
TL;DR: In this article , an alloy was treated with deep cryogenic treatment (DCT) and retrogression and re-aging treatment (RRA) and the corrosion behavior of the alloy was investigated by potentiodynamic polarization measurement, electrochemical impedance spectroscopy and intergranular corrosion test.
References
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Journal ArticleDOI
Limit strains in the processes of stretch-forming sheet metal
TL;DR: In this paper, a theoretical analysis of the process of the generation of the groove based on anisotropic plasticity theory is presented, and the system of equations derived was solved numerically with the aid of a computer, which enabled the limiting strain of the sheet metal to be determined as a function of the material.
Journal ArticleDOI
Plane stress yield function for aluminum alloy sheets—part 1: theory
Frédéric Barlat,Frédéric Barlat,J.C. Brem,Jeong W. Yoon,Jeong W. Yoon,Kwansoo Chung,Re Dick,D.J. Lege,Farhang Pourboghrat,Shi-Hoon Choi,E. Chu +10 more
TL;DR: In this article, a plane stress yield function that well describes the anisotropic behavior of sheet metals, in particular, aluminum alloy sheets, was proposed, which was introduced in the formulation using two linear transformations on the Cauchy stress tensor.
Journal ArticleDOI
A six-component yield function for anisotropic materials
TL;DR: In this paper, a new six-component yield surface description for orthotropic materials is developed, which has the advantage of being relatively simple mathematically and yet is consistent with yield surfaces computed with polycrystal plasticity models.
Journal ArticleDOI
Linear transfomation-based anisotropic yield functions
TL;DR: In this article, two convex formulations are proposed to describe the anisotropic behavior of metals and alloys for a full stress state (3D) in general terms, and the type of input data recommended for the description of plastic anisotropy in sheet samples is discussed.