The composition of Al-Cu-Mn ternary eutectic alloy was chosen to be Al-32.5 wt.%Cu-0.6 wt.%Mn to the Al2 Cu and Al12 Cu Mn2 solid phases within an aluminum matrix(α-Al) from its melt. The Al-32.5 wt.%Cu-0.6 wt.%Mn alloy was directionally solidified at a constant temperature gradient(G=8.1 K·mm^(-1)) with different growth rates, 8.4 to 166.2 μm·s^(-1),by using a Bridgman-type furnace. The eutectic temperature(the melting point) of 547.85 °C for the Al-32.5 wt.%Cu-0.6 wt.%Mn alloy was obtained from the DTA curve of the temperature difference between the test sample and the inert reference sample versus temperature or time. The lamellar spacings(λ) were measured from transverse sections of the samples. The dependencies of lamellar spacings(λAl-Al2 Cu) and microhardness on growth rates were obtained as, λ_(Al-Al2Cu)=3.02 V^(-0.36), HV=153.2(V)^(0.035), HV=170.6(λ)^(-0.09) and HV=144.3+0.82(λ_(AlAl2 Cu))^(-0.50), HV=149.9+53.48 V^(0.25), respectively, for the Al-Cu-Mn eutectic alloy. The bulk growth rates were determined as λ~2_(Al-Al2 Cu)·V = 25.38 μm^3·s^(-1) by using the measured values of λ_(Al-Al2 Cu) and V. A comparison of present results was also made with the previous similar experimental results.
展开▼
机译:Microstructural evolution and mechanical properties of FeCoCrNiCu high entropy alloys:a microstructure-based constitutive model and a molecular dynamics simulation study
机译:Etude du Comportement micro-mecanique d'Une Vitroceramique a subst de siO2-al2O3-Li2O en Liaison avec la microstructure(siO2-al2O3-Li2O玻璃陶瓷的微观力学行为及其与微结构的关系研究)