Journal ArticleDOI
On the Precipitation-Hardening Behavior of the Al-Mg-Si-Cu Alloy AA6111
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TLDR
In this article, the precipitation-hardening behavior of aluminum alloy AA6111 during artificial aging and the influence of prior natural aging on the aging behavior were investigated using quantitative transmission electron microscopy (TEM) and differential scanning calorimetry (DSC).Abstract:
The precipitation-hardening behavior of aluminum alloy AA6111 during artificial aging and the influence of prior natural aging on the aging behavior were investigated. The evolution of microstructure was studied using quantitative transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The evolution of the relative volume fraction of precipitates for the solution-treated alloy was determined using isothermal calorimetry and a new analysis based on the DSC technique. Quantitative TEM was also used to obtain the rate of precipitation of microscopically resolvable phases during aging at 180 °C. Three types of precipitates, i.e., unresolved Guinier-Preston (GP) zones, β″, and Q′, were found to form during aging at 180 °C. The evolution of yield strength was related to the evolution of microstructure. It was found that the high hardening rate during artificial aging for the solution-treated alloy is due to the rapid precipitation of the β″ phase. Natural aging prior to artificial aging was found to decrease the rate of precipitation of β″. The slow hardening rate for the naturally aged alloy was attributed to the slower nucleation and growth of β″ phase.read more
Citations
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Journal ArticleDOI
The influence of processing parameters on aluminium alloy A357 manufactured by Selective Laser Melting
TL;DR: In this article, the effects of selective laser melting (SLM) on the microstructure and mechanical properties of A357 aluminium alloys were investigated, where the SLM processing parameters were optimised to achieve maximum density, corresponding to an extremely fine micro structure with very few pores, which translates to differences in mechanical properties compared to conventional cast alloy.
Journal ArticleDOI
A yield strength model for the Al-Mg-Si-Cu alloy AA6111
TL;DR: In this paper, a yield strength model for the Al-Mg-Si-Cu alloy AA6111 was developed for various stages of aging and the applicability of both strong and weak obstacle models was examined.
Journal ArticleDOI
Integrated modeling of friction stir welding of 6xxx series Al alloys: Process, microstructure and properties
TL;DR: In this paper, an integrated modeling framework for friction stir welding of 6xxx series Al alloys has been established and applied to the 6005A and 6056 alloys.
Journal ArticleDOI
Prospects of laser beam welding and friction stir welding processes for aluminum airframe structural applications
TL;DR: In this article, laser beam welding (LBW) and friction stir welding (FSW) are applied to high-strength aluminum alloys used in aircraft industry and displays their advantages compared with the riveting technique regarding structural integrity, weight and material savings.
Journal ArticleDOI
The shearable–non-shearable transition in Al–Mg–Si–Cu precipitation hardening alloys: implications on the distribution of slip, work hardening and fracture
TL;DR: In this paper, a systematic study has been conducted to evaluate the nature of the dislocation-precipitate interaction and its relationship to the mechanical properties for a commercial Al-Mg-Si-Cu alloy.
References
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Transmission Electron Microscopy
TL;DR: The client would like to get a larger, approximately 3 cm in diameter, well fixed tissue sample, together with a detailed report of the clinical presentation, gross, and microscopic lesions, along with the submission of samples prepared in a similar manner by the client for processing.
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Electron Microscopy of Thin Crystals
TL;DR: Hirsch et al. as mentioned in this paper described further experiments on the preparation of thin film sections of embedded Backscatter Kikuchi diffraction in the SEM for identification of crystallographic thin films by electron microscopy.
Journal ArticleDOI
The precipitation sequence in Al–Mg–Si alloys
TL;DR: In this article, the fine-scale precipitation that occurs during age hardening of Al alloy 6061 has been studied using differential scanning calorimetry (DSC), APFIM and transmission electron microscopy (TEM).
Journal ArticleDOI
The crystal structure of the β′ phase in Al–Mg–Si alloys
R. Vissers,R. Vissers,M.A. van Huis,Johannes C. Jansen,Henny W. Zandbergen,Calin Daniel Marioara,S. J. Andersen +6 more
TL;DR: In this paper, the crystal structure of β″, one of the strengthening phases in the commercially important Al-Mg-Si alloys, is determined by using of high resolution electron microscopy (HREM) and electron diffraction (ED).
Journal ArticleDOI
Pre-precipitate clusters and precipitation processes in Al-Mg-Si alloys
Mitsuhiro Murayama,Kazuhiro Hono +1 more
TL;DR: In this paper, a three-dimensional atom probe (3DAP) and transmission electron microscopy (TEM) was used to characterize the solute clusters and the metastable precipitates in aged Al-Mg-Si alloys.
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