Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after 1 pass of equal channel angular pressing
Qiao, Xiaoguang, Starink, M.J. and Gao, Nong (2009) Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after 1 pass of equal channel angular pressing. Materials Science and Engineering: A, 513-514, 52-58. (doi:10.1016/j.msea.2009.01.051).
Samples of an Al1050 aluminum alloy (99.5% Al) were subjected to equal channel angular pressing (ECAP) at room temperature for 1 pass. The microhardness is highest at the centre of the cross section of the billet, and the grain size is smallest at the edges, which rules out grain size strengthening as the dominant hardening mechanism. On isochronal ageing at temperatures between 200 and 375 ºC, low angle grain boundaries disappear, the hardness gradually decreases, and hardness differences gradually disappear. A model is described that captures the strengthening mechanisms and model results fit the experimental results well. Analysis of recovery behaviour and strength modelling indicates that the contribution of the dislocations to the strength is higher than that of grain size.
|Keywords:||aluminium, equal channel angular pressing (ecap), strength model, dislocation density, grain size, recovery, hpt, work hardening|
|Subjects:||T Technology > TN Mining engineering. Metallurgy|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
|Date Deposited:||12 Jan 2009|
|Last Modified:||28 Mar 2014 15:24|
MEMS COMPONENTS FORMED FROM NANOSTRUCTURAL METALS
Funded by: EPSRC (EP/D00313X/1)
Led by: Nong Gao
1 August 2006 to 31 October 2009
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