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中文摘要：
采用负压浸渗-液固挤压法制备了定向短切碳纤维（aligned Csf）及穿刺-2D碳纤维织物（2.5DCf）增强镁合金复合材料,观察了两种复合材料的微观组织结构,测定了其在30～350℃范围的热膨胀系数（α）,并在Schapery模型的基础上提出了计算定向Csf/Mg复合材料及2.5DCf/Mg复合材料α值的修正模型。结果表明,在30～200℃范围内,两种Cf/Mg复合材料的α值均表现出随温度的升高而升高的趋势,但在超过250℃以后,α值出现降低或稳定的现象,其原因为随着温度的升高,铝元素固溶度的增大、基体发生部分塑性变形等因素导致的;提出的修正模型理论计算值与其相应的实验测试α值之间的误差均在5%之内,表明该修正模型能够有效预测实验中的α值。
英文摘要：
Aligned short carbon fibre（aligned Csf） and 2.5D carbon fabric reinforced magnesium alloy composites were fabricated by vacuum infiltration-semisolid extrusion technology.The microstructure of composites were observed,the coefficient of thermal expansion（α） of composites from 30 to 350℃ were measured,and the corresponding theory models for predicting the α were modified based on Schapery model.The results show that the α of composites was increased with the temperature increased from 30 to 200℃,however the α of composites was decreased or tended to stability when the temperature exceeded 250℃.The α didn＇t increased continuously with the temperature increased,which was due to the solubility of aluminum element increased,magnesium alloy occurred plastic deformation;the errors between the theory values of revised model and the experimental values were all less than 5%,which indicated the theory model could predict the α of experimental effectively.
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