Age hardening of sintered Al-Cu-Mg-Si-Sn alloys

Kent, Damon (2004). Age hardening of sintered Al-Cu-Mg-Si-Sn alloys MPhil Thesis, School of Engineering, The University of Queensland.

       
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Author Kent, Damon
Thesis Title Age hardening of sintered Al-Cu-Mg-Si-Sn alloys
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2004
Thesis type MPhil Thesis
Supervisor Prof G. Schaffer
Prof J. Drennan
Total pages 125
Collection year 2004
Language eng
Subjects 291300 Metallurgy
Formatted abstract The primary aim of this thesis was to investigate the age hardening response of sintered Al-Cu-Mg-Si-Sn alloys. Key factors that may alter their age hardening response were investigated, including greater levels of porosity and the effect of trace additions of tin used to aid sintering. A secondary aim was to identify whether research on precipitation in similar wrought alloys could be applied to these powder metallurgy (P/M) alloys.

The ageing response of sintered Al-Cu-Mg-Si-Sn alloys was found, in general, to be similar to the wrought counterparts. Artificial ageing resulted in comparable peak hardness values over the same ageing periods. The precipitates formed and the sequence of formation was found to agree with other studies on wrought alloys. Natural ageing also resulted in comparable levels of hardening to that observed in wrought alloys, although some anomalous results were obtained when the precipitate microstructures of the P/M alloys were examined.

Greater levels of porosity in the P /M alloys did not significantly affect the kinetics of the precipitation reactions during artificial ageing. Trace levels of tin may slightly reduce the hardening response of the P /M alloys. However, this must be considered with respect to the significant improvement in density obtained through tin additions and hence improvements in strength, ductility and fatigue properties of the alloys.
Keyword Powder metallurgy

 
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Created: Tue, 01 Nov 2011, 13:17:15 EST by Bekti Mulatiningsih on behalf of The University of Queensland Library