Activation Distance Determination of Rate Controlling Obstacles in the Age Hardening of a Quasi-Binary Al-Mg2Si Alloy

Bradley Diak; Rathna Lanerolle

doi:10.4028/www.scientific.net/MSF.794-796.455

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HomeMaterials Science ForumMaterials Science Forum Vols. 794-796Activation Distance Determination of Rate...

Activation Distance Determination of Rate Controlling Obstacles in the Age Hardening of a Quasi-Binary Al-Mg₂Si Alloy

Abstract:

The age hardening response of a quasi-binary Al-Mg₂Si alloy was studied using activation distance analysis of precise strain rate sensitivity experiments at 78 and 300K. The alloy of Al-0.7Mg-0.33Si-0.024Fe-0.006Ti(at.%) has a stochiometrically balanced composition of Mg₂Si. The alloy was solutionized at 550°C and ice water quenched before ageing in one of two ways: single-step or multi-step ageing. For single-step ageing: specimens were naturally aged for 70 days at room temperature (RT); pre-aged for 16 hours at 70°C; or artificially aged for 30 min or 10 hours at 175°C. For multi-step ageing: specimens were pre-aged at 70°C for 16 hours after natural ageing for 70 days at RT; artificially aged for 30 min or 10 hours at 175°C after pre-aging at 70°C for 16 hours; or artificially aged for 10 hours at 175°C after natural aging for 70 days at RT. The activation analysis reveals rate controlling obstacle dimensions ranging from 0.3 to 10 nm depending upon the ageing condition. A comparison is made to a prior three dimensional atom probe ageing study of the same alloy [Murayama and Hono, Acta Mater., 47 (1999) 1537-1578.].

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Materials Science Forum (Volumes 794-796)

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455-460

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https://doi.org/10.4028/www.scientific.net/MSF.794-796.455

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June 2014

Authors:

Bradley Diak*, Rathna Lanerolle

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Age Hardening, Al-Mg-Si, Obstacle, Strain Rate Sensitivity, Thermal Activation

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