Controlled semisolid microstructures and mechanical properties of Al–Mg–Si–Mn wrought alloy produced by D-SSF
Authors: Yoshida, T.; Eidhed, W.; Tezuka, H.; Sato, T.
Source: International Journal of Cast Metals Research, Volume 21, Numbers 1-4, August 2008 , pp. 174-179(6)
Publisher: Maney Publishing
Abstract:The semisolid microstructures and the mechanical properties of Al–1˙35Mg–1˙04Si–0˙67Mn alloy produced by deformation semisolid forming (D-SSF) process were studied. Fine α-Al15Mn3Si2 compounds precipitate homogeneously during the homogenisation treatment. These compounds effectively inhibit the coarsening of recrystallised grains during heating to the semisolid temperature. When the liquid fraction is controlled to be ∼23%, the complete die filling is not achieved. Therefore, in order to achieve good fluidity, it is necessary to control the liquid fraction to be more than 30%. The average grain size and the liquid fraction at the semisolid temperature influence directly mechanical properties. Therefore, the relationship among the average grain size, the liquid fraction at the semisolid temperature and mechanical properties was evaluated. Furthermore, the optimum semisolid microstructure was determined and the condition for the D-SSF process was established.
Document Type: Research Article
Publication date: August 2008
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