Thermal Stability In Al-Mn-Cr-Zr Based Aluminium Alloys Tailored For Powder Bed Fusion - Laser Beam

Paper in proceeding, 2022

Al-Mn-Cr-Zr family of alloys tailored for powder bed fusion - laser beam process have been developed by the authors. The alloys were designed by leveraging negligible solidification range close to solidification, leading to an "inherently crack free" alloy system. These alloys have been designed to benefit from higher amount of solutes in solid solution, which leads to stronger precipitation hardening via direct ageing to achieve high strengths. Since the alloying elements were selected having low bulk diffusivities, slower precipitation kinetics is expected which suggests retention of high strength even after secondary ageing post peak hardening. Upon secondary ageing the alloys at 523K for 2544 hours and 623K 1054 hours negligible hardness loss at 523K and 17 HV loss at 623K was observed. This was benchmarked against Scalmalloy® which was seen to have negligible hardness loss at 523K and 28 HV loss at 623 K respectively.