深冷處理對連續(xù)Cf/ZL301復(fù)合材料拉伸強(qiáng)度與殘余應(yīng)力的影響

深冷處理對連續(xù)Cf/ZL301復(fù)合材料拉伸強(qiáng)度與殘余應(yīng)力的影響Effect of cryogenic treatment on tensile strength and residual stress of continuous Cf/ZL301 composite

選用M40石墨纖維(6K)和ZL301鋁合金作為增強(qiáng)體和基體，采用真空氣壓浸滲法制備了纖維體積分?jǐn)?shù)40%的單向連續(xù)Cf/ZL301復(fù)合材料，研究冷處理及退火處理對連續(xù)Cf/ZL301復(fù)合材料的拉伸強(qiáng)度和殘余應(yīng)力的影響。結(jié)果表明：液氮深冷處理12、24和48 h后可以提高連續(xù)Cf/ZL301復(fù)合材料的拉伸強(qiáng)度，其中經(jīng)液氮深冷處理12 h的復(fù)合材料強(qiáng)度提高幅度最大，較鑄態(tài)提高13.5%；干冰冷處理對連續(xù)Cf/ZL301的拉伸強(qiáng)度影響不大；而退火處理使連續(xù)Cf/ZL301復(fù)合材料的強(qiáng)度下降18.6%。影響復(fù)合材料拉伸強(qiáng)度的原因應(yīng)是不同的處理工藝產(chǎn)生的由體積收縮導(dǎo)致的孔隙閉合效應(yīng)程度不一以及在不同程度上改變復(fù)合材料的殘余應(yīng)力。

The vacuum gas pressure infiltration was performed for the continuous Cf/ZL301 composite with the volume fraction of 40%, of which the reinforced material was M40 graphite fiber and the matrix alloy was ZL301 alloy, both the effects of cryogenic treatment and annealing treatment on the tensile strength and residual stress of continuous Cf/ZL301 composites were studied. The results show that the tensile strength of Cf/ZL301 composites can be improved after cryogenic treatment for 12 h, 24 h or 48 h in liquid nitrogen. The tensile strength of Cf/ZL301 composites has the largest improved after cryogenic treatment for 12 h in liquid nitrogen, compared with the as cast composite increased of 13.5%. Dry ice treatment has little effect on the tensile strength of Cf/ZL301. The tensile strength of Cf/ZL301 composites decreases of 18.6% by annealing treatment. The reason for effecting on the tensile strength of Cf/ZL301 composites should be that the pore closure is different caused by volume shrinkage and the residual stress of composite has changed in different extent because of the different treatment process.

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