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研究了单级固溶及峰值时效处理对粉末热挤压法制备5 vol%Mg2B2O5w/6061Al复合材料组织和力学性能的影响。结果表明:经粉末热挤压制备的材料,晶须分布相对均匀,但长径比显著降低,材料主要由α(Al)、Mg2B2O5w和Mg2Si相为主;热挤压态复合材料经固溶时效(510℃×1 h+160℃×9 h)处理后,晶粒内部析出大量的β’相;拉伸强度、屈服强度和伸长率分别为357.6 MPa、205 MPa和8.77%,相比挤压态复合材料,拉伸强度和屈服强度分别提高了81%和78%;拉伸断口分析表明,材料的失效形式以基体的韧性断裂和晶须团聚体的脆性开裂为主。
The effects of single-stage solution treatment and peak aging treatment on microstructure and mechanical properties of 5 vol% Mg2B2O5w / 6061Al composites prepared by powder hot extrusion were investigated. The results show that the material prepared by powder extrusion has a relatively uniform distribution of whiskers, but the aspect ratio is significantly reduced. The materials are mainly composed of α (Al), Mg2B2O5w and Mg2Si phases. The hot- (510 ℃ × 1 h + 160 ℃ × 9 h), a large number of β ’phases were precipitated in the grains. The tensile strength, yield strength and elongation were 357.6 MPa, 205 MPa and 8.77% Tensile strength and yield strength of the composites increased by 81% and 78% respectively. Tensile fracture analysis showed that the failure modes of the composites were ductile fracture of matrix and brittle fracture of whisker aggregates.