Quasicrystalline and L12 precipitates in a microalloyed Al-Mn-Cu alloy

Publication date: March 2020Source: Materials Today Communications, Volume 22Author(s): Franc Zupanič, Christian Gspan, Jaka Burja, Tonica BončinaAbstractAn Al-Mn-Cu alloy was microalloyed with beryllium, scandium and zirconium, cast into a copper mould, and aged at different temperatures. It was characterised using X-Ray Diffraction, Differential Scanning Calorimetry and Transmission Electron Microscopy. The compression tests of samples aged at 400 °C for 1 h were performed at room temperature, 300 °C and 350 °C, while the accelerated creep tests were performed at 300 °C and 350 °C. Icosahedral QuasiCrystalline and L12 precipitates prevailed in the as-aged microstructure, while the fraction of decagonal precipitates was low. The precipitates possessed specific orientation relationships with the matrix. The alloy exhibited enhanced hardness, compressive strength, and creep resistance in comparison to the Al-Mn-Cu alloys.Graphical abstract
Source: Materials Today Communications - Category: Materials Science Source Type: research