Solid-Phase Sintering of Al-Cr(Si,Ti) Powder Foundry Alloys Obtained by Self-Propagating High Temperature Synthesis

摘要

Volume changes during solid-phase sintering and the structure and phase composition of materials sintered of the binary and ternary powder foundry alloys of the Al-Cr(Si,Ti) system are investigated. The powders for sintering were obtained by self-propagating high-temperature synthesis (SHS) in the mixtures of elementary powders of four target compositions with the subsequent crashing of the cakes and sieving of fine fractions. When sintering all the pressings under study, volume shrinkage, which monotonically increased with an temperature rise and the duration of the isothermal holding, take place. The results of structural investigations of the sintered materials, which were performed applying the methods of X-ray structural analysis, electron probe microanalysis, optical and scanning microscopy, are discussed jointly with the results of investigations of the volume variations during sintering.