Effects of Heat Treatment on Bending Strength of Aluminum AlIoy Matrix Composites Reinforced Aluminum Borate Whisker

摘要

The ABO_w/AC4CH composite was fabricated by a squeeze casting method. The volume fraction of the whisker was 20/100. The composition of matrix alloy was Si: 7. lwt/100, Mg: 0.39wt/100, Cu: 0.0lWt/100, Fe: 0.ll, Al: 92.3Wt/100. The composites were solutionized at various temperatures and times: 480deg.C, 520deg.C and 560deg.C, 5minutes, 30minutes, 60minutes and 90minutes, then quenched into water and maintained at 25deg.C, to investigate the effect of precipitation on the properties of the composite. The bending strength was tested by an MTS 8l0 material test system, and micro-Vicker's hardness was investigated by aging time. Microstructure and interfacial reaction were studied by scanning electron microscope and X-ray diffraction (XRD).