کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1613006 | 1516308 | 2014 | 5 صفحه PDF | دانلود رایگان |
• The effect of Si additions on microstructure and mechanical properties of Al–4Cu–1.3Mg alloy was investigated.
• The presence of σ-Al5Cu6Mg2 phases was improved the tensile strengths of the alloys efficiently at elevated temperatures.
• The absence of σ precipitates leads to a loss of the tensile strengths of the alloy at elevated temperature.
The effect of Si additions on microstructure and mechanical properties of Al–4Cu–1.3Mg (wt%) alloy was investigated by microhardness measurements, TEM and HRTEM observations, mechanical properties test. The results indicate that the cubic σ-Al5Cu6Mg2 phases precipitate from matrix of the Al–4Cu–1.3Mg–0.3Si and Al–4Cu–1.3Mg–0.6Si alloys. The presence of σ-Al5Cu6Mg2 phases improved the tensile strengths of the alloys efficiently at elevated temperatures. The Al–4Cu–1.3Mg–0.9Si alloy following T6 peak ageing temper contained S′-Al2CuMg and β′-Mg2Si precipitates but slightly inhibited σ-Al5Cu6Mg2. The absence of σ precipitates leads to a loss of the tensile strengths of the alloy at elevated temperature.
Journal: Journal of Alloys and Compounds - Volume 585, 5 February 2014, Pages 474–478