铬含量对Al-Cr/Al原位复合材料微观组织及拉伸性能的影响

Effect of Cr Content on Microstructure and Tensile Properties of Al-Cr/Al Situ Composites

研究了铬含量对Al-Cr/Al原位复合材料微观组织及拉伸性能的影响。利用XRD对复合材料进行物相分析,应用扫描电镜观察增强体颗粒的大小、形貌和分布,并研究了复合材料的拉伸性能。结果表明,Al-Cr/Al原位复合材料Al和Cr首先生成Al0.983Cr0.017金属间化合物,随着Cr含量的增加,反应生成Cr、Al比例更高的化合物;复合材料的增强颗粒呈不规则多边形,均匀分布在基体中,与基体结合良好;随着铬含量的增加,增强颗粒的体积也在增大;由于生成了具有一定脆性的Al-Cr金属间化合物颗粒,抑制了基体的连续性,使复合材料的拉伸性能有所下降。

The effect of Cr content on the microstructure and tensile properties of Al-Cr/Al situ composites were investigated. Then the reinforced phase were characterized by XRD and EDS, the reinforcement particle size, morphology and distribution were observed using SEM, and the tensile properties of the composite material were measured. The results show that the inter-metallic Al0.983Cr0.017 was first generated in Al and Cr situ reaction. With the increase of Cr content,high-chromium compound were generated. The reinforcing particles of the composites are irregular polygons, evenly distributed in the matrix and has good interfacial bond. With the increase of Cr content, the volume of reinforcing particles also increases. The formation of Al-Cr inter-metallic particles has a certain brittle to inhibit matrix continuity, so that the tensile properties of the composites decreases.