Mechanical properties of diffusion-bonded Cu-0.1Zr alloy and age hardening behavior

Al-Li alloys have higher mechanical properties and more lightweight than other conventional aluminum alloys. Therefore , it is focused as a good material for weight reduction of industrial fields. However, since the Al-Li alloy are highly active and hard to cast, there has been limited research on casting. In this study, age-hardening behavior of Al-2.5mass%Li alloys cast into sand and metal mold were investigated. All alloys cast into Y-block shape sand mold, and then artificial aged after solution treated at 743K for 36ks. Because of difference in quantity of precipitation by metastable δ’(Al3Li) phase, peak hardness of metal mold casting is higher than that of sand molds castings.

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Relationship between mechanical properties and age-hardening behavior around grain boundaries of Al-Mg-Si alloy

MATEC Web of Conferences ◽

10.1051/matecconf/202032603002 ◽

2020 ◽

Vol 326 ◽

pp. 03002

Author(s):

Takuya Hashimoto ◽

Ken-ichi Ikeda ◽

Seiji Miura

Keyword(s):

Mechanical Properties ◽

Rotation Angle ◽

Coincident Site Lattice ◽

Age Hardening ◽

Precipitation Behavior ◽

Site Lattice ◽

Hardening Behavior ◽

Aging Precipitation ◽

Peak Aged ◽

Electron Back Scattered Diffraction

Nanoindentation tests were conducted near the grain boundary (GB) of the Al-Mg-Si alloy, and the influence of GB character on the aging precipitation behavior and the mechanical properties was confirmed. After obtaining the GB characters by electron back scattered diffraction (EBSD) analysis, nanoindentation tests were carried out on under-aged, peak-aged, and over-aged samples. And then, the indentation areas were observed by back scattered electrons imaging (BSE) in order to identify indentation positions with respect to the GB. In this study, for the GB character, focusing on the rotation angle, the high-angle GB (HAGB) and the low-angle GB (LAGB) were selected. In addition, coincident site lattice GBs (CSL) were selected as the special GB. In the 180°C under-aged samples, the nano-hardness near GB is higher than that far from GB, while 180°C peak-aged samples, the nano-hardness is lower than that far from GB. Then the range near the GB where the hardness changes was larger at HAGB than at LAGB and CSL3. This suggests that the GB character affects the aging precipitation behavior and mechanical properties.

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Evolution of Mechanical Behavior of 6XXX Aluminium Alloy due to the Precipitation State During a Thermo-Mechanical Process

Volume 6B: Materials and Fabrication ◽

10.1115/pvp2013-97426 ◽

2013 ◽

Author(s):

Didier Bardel ◽

Michel Perez ◽

Daniel Nelias ◽

Thibaut Chaise ◽

Jerôme Garnier ◽

...

Keyword(s):

Mechanical Properties ◽

Mechanical Behavior ◽

Aluminium Alloy ◽

Coupled Model ◽

Theoretical Background ◽

Age Hardening ◽

General Idea ◽

Hardening Behavior ◽

Fea Model ◽

Microstructural Model

The aim of this research is to link the microstructural state and the mechanical properties of an age hardening alloy during a fast heat treatment such as encountered during welding. A coupled model between precipitation state and mechanical properties is used to predict the yield strength and hardening behavior that can be observed experimentally. The method permits the identification of the kinematic and isotropic contributions in the hardening model. The methodology is applied to a 6061-T6 aluminium alloy which is used in the Jules Horowitz reactor vessel. The general idea of this methodology is to couple an efficient microstructural model to a mechanical one based on the dislocation theory and ad’hoc experiments. The theoretical background is based on the work of Kampmann and Wagner, known as the KWN model, to account for nucleation, growth/dissolution and coarsening of precipitates. This analysis requires transient thermo-mechanical experimental data. The efficiency of these models and their coupling are shown for a serie 6XXX aluminium alloy which contains β″ and β′ precipitates. Ultimately these models are coupled to a FEA model and allows to predict the distribution of precipitates within each element of the mesh, and subsequently its mechanical behavior.

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Effects of Titanium Refining Methods on the Microstructure and Mechanical Properties of A356-0.1%Ti Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.937 ◽

2007 ◽

Vol 546-549 ◽

pp. 937-940

Author(s):

Ji Wen Li ◽

Jing Pei Xie ◽

Zhong Xia Liu ◽

Wen Yan Wang

Keyword(s):

Mechanical Properties ◽

Age Hardening ◽

Continuous Transition ◽

Hardening Behavior ◽

Β Phase ◽

Ti Alloys ◽

Microstructure And Mechanical Properties ◽

Dsc Analyses ◽

High Age ◽

Lower Temperature

Effects of titanium refining methods on the microstructure and mechanical properties of A356 alloys were studied. The results showed that the A356 alloys refining by electrolytic low titanium Al alloys had excellent grain refinement effect and high age-hardening behavior comparing with the traditional A356 alloys. By means of DSC analyses, the solidification characteristics and the age-hardening behavior were discussed. The results showed that the E-A356 alloys had more powerful nucleation potency than that of the M-A356 alloys. The exothermic peaks of β// phase was shifted to a slightly lower temperature, and the rate of the continuous transition from GP zone to metastable phases increased.

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The Effect of Y on Aging Response and Mechanical Properties of Mg-Ho-Zr Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.704-705.546 ◽

2011 ◽

Vol 704-705 ◽

pp. 546-551

Author(s):

Bao Zhong Liu ◽

Jiao Jiao Liu ◽

Jian Li Wang ◽

Bao Qing Zhang ◽

Zhi Zhang

Keyword(s):

Mechanical Properties ◽

Age Hardening ◽

Stable Phase ◽

Hardening Behavior ◽

Aging Response ◽

Cast Alloys ◽

Peak Aged ◽

Aged State ◽

Alloy Microstructure ◽

Zr Alloy

Mg-10Ho-0.6Zr alloys with different amount of Y additions are prepared by metal mould casting method. The effects of Y content on microstructure, age hardening behavior and mechanical properties are investigated. Results show that all the as-cast Mg-10Ho-xY-0.6Zr alloys are mainly comprised of α-Mg matrix and Mg24(Ho,Y)5phase. With increasing Y content, grain size of the as-cast alloys is reduced. Age hardening response, Vickers hardness and mechanical properties are improved with the addition of Y. The maximum ultimate tensile strength (UTS) and yield strength (YS) are obtained in Mg-10Ho-3Y-0.6Zr alloy at peak-aged state, and the values are 215 MPa, 158 MPa at room temperature, and 144 MPa, 126 MPa at 250 °C, respectively. The improvement of the UTS is mainly attributed to the fine distributed quadrate-like β stable phase. Key words: Mg-Ho-Y-Zr alloy; Microstructure; Age hardening behavior; Mechanical properties

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Modelling of the Age-Hardening Behavior in AA6xxx within a Through-Process Modelling Framework

Materials Science Forum ◽

10.4028/www.scientific.net/msf.877.640 ◽

2016 ◽

Vol 877 ◽

pp. 640-646 ◽

Cited By ~ 2

Author(s):

Feng Xin Mao ◽

Christian Bollmann ◽

Thiemo Brüggemann ◽

Ze Qin Liang ◽

Hai Chun Jiang ◽

...

Keyword(s):

Mechanical Properties ◽

Process Modelling ◽

Age Hardening ◽

Artificial Ageing ◽

Industrial Processing ◽

Innovation Research ◽

Hardening Behavior ◽

Modelling Framework ◽

Precipitation Model ◽

Evolution Of Microstructure

The manufacturing of AA6xxx car body panels typically consists of rolling, ageing and forming processes. Thus, multiple simulation tools can be coupled to set up a through-process modelling (TPM) framework for predicting the evolution of microstructure and the final mechanical properties of these products. In order to realize such a TPM concept, various industrial processing phenomena were studied and modelled in the open innovation research cluster “Advanced Metals and Processes” (AMAP♯). This work focuses on the age hardening behavior which takes place during the industrial paint bake process. To reflect the microstructure evolution of this processing step, a multi-component precipitation model is developed. So far, the influences of thermomechanical processes, i.e. annealing temperature on the kinetics of MgxSiy precipitates during artificial aging were implemented. The precipitation model was linked to a yield strength model in order to simulate the evolution of mechanical properties within the TPM framework. For validation, the evolution of microstructure and mechanical properties of an AA6016 alloy during artificial ageing was investigated via transmission electron microscopy (TEM) and tensile testing. The simulation results are in agreement with experimental observations.

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