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中文摘要：
采用粉末冶金法制备了含量分别为5%、10%、15%、20%（体积分数,下同）的硼酸镁（Mg2B2O5）晶须增强6061铝基复合材料,利用SEM和EPMA研究了复合材料的微观组织,并测定了其力学性能。结果表明：在复合材料制备过程中Mg2B2O5晶须发生了破碎和折断,Mg2B2O5多以晶须团聚体的形式存在,出现尺寸为10~25μm的颗粒状增强体;Mg2B2O5晶须沿挤压方向定向排列,并且定向排列性随晶须含量的增加而减弱;复合材料的抗拉强度随着晶须含量的增加先升高后降低,并在晶须含量为15%时达到最大值191MPa,较基体合金增加16.5%;复合材料的伸长率随晶须含量的增加逐渐下降,当晶须含量为20%时降至最低值6.3%。
英文摘要：
Magnesium borate whisker reinforced Mg 2 B 2 O 5w /6061 aluminum alloy matrix composites with the whisker volume fractions of 5%,10%,15% and 20% were fabricated by hot extrusion method,and the samples were investigated by mechanical property analysis.The micro-structures of the composites were investigated by scanning electron microscopy（SEM） and electron probe microanalysis（EPMA）.The results show that during the preparation of composites,magnesium borate whisker emerges crack and breakdown,and exists mostly in the form of whisker cluster with size of 10 ~ 25μm.The magnesium borate whisker has directional alignment along extrusion direction and this nature decreases with the increasing whisker content.The tensile strength of composites first increases then decreases with increase of the whisker content and reaches the maximum value of 191MPa at the whisker content of 15vol%,which is 16.5% higher than that of alloy matrix.The elongation rate of composites decreases as the increase of whisker content and reaches the minimum of 6.3% when the whisker content is 20vol%.
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