| ZA22/Al2O3短纤维复合材料高温拉伸行为的理论分析 |
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| 引用本文： | 于思荣,何镇明,任露泉.ZA22/Al2O3短纤维复合材料高温拉伸行为的理论分析[J].复合材料学报,1998,15(3):17-20. |
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| 作者姓名： | 于思荣 何镇明 任露泉 |
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| 作者单位： | 吉林工业大学铸造教研室 |
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| 摘 要： | 采用日本产A G-10TA 型电子万能试验机对挤压铸造ZA 22/Al2O3短纤维复合材料的高温抗拉强度进行了测定, 并用Friend 修正的混合律模型对该试验结果进行了理论分析, 结果表明ZA 22/Al2O3短纤维复合材料及其基体的强度均随温度升高而下降, 但ZA 22合金基体的强度下降幅度更大。任一纤维体积分数的复合材料, 均存在一临界转变温度T crit; 超过该温度, 复合材料强度大于基体强度。纤维体积分数越大, 所需临界转变温度越低。在本试验中, V f 为15% 和20% 的复合材料的Tcrit分别为123℃和87℃。任一温度下, 复合材料均存在一临界纤维体积分数, 超过该纤维体积分数, 复合材料强度高于基体强度。温度越高, 临界纤维体积分数越低。对ZA 22/Al2O3短纤维复合材料来说, Friend 模型中的经验参数C3 的取值随温度升高而降低。
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| 关 键 词： | ZA 22 Al2O3 金属基复合材料 高温抗拉强度 |
| 收稿时间： | 1997-01-14 |
| 修稿时间： | 1997-04-23 |
THEORETICAL ANALYSES ON TENSILE STRENGTH OF ZA22/Al2O3 SHORT FIBER COMPOSITES AT ELEVATED TEMPERATURE |
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| Yu Si-rong,He Zhen-ming,Ren Lu-quan.THEORETICAL ANALYSES ON TENSILE STRENGTH OF ZA22/Al2O3 SHORT FIBER COMPOSITES AT ELEVATED TEMPERATURE[J].Acta Materiae Compositae Sinica,1998,15(3):17-20. |
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| Authors: | Yu Si-rong He Zhen-ming Ren Lu-quan |
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| Affiliation: | Jilin University of Technology, Changchun 130025 |
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| Abstract: | The tensile strength of squeeze casting ZA22/Al2O3 short fiber composites at elevated temperature was measured with autograph AG 10TA universal testing machines made in Japan. The experimental results were analyzed by means of the rule of mixture (ROM) model modified by Friend. The results show that the tensile strength of ZA22 alloy and ZA22/Al2O3 short fiber composites decreases with the increasing temperature, but the decreasing rate of the tensile strength of ZA22 alloy is larger than that of ZA22/Al2O3 short fiber composites. There is a critical temperature T crit for any composites with a fiber volume fraction. The tensile strength of the composites is higher than that of matrix if the temperature is above T crit . The more the fiber volume fraction is, the lower the critical temperature T crit . T crit of the composites with 15% and 20% fiber volume fraction are 123℃ and 87℃, respectively. There is a critical fiber volume fraction V crit under a temperature. The tensile strength of the composites is higher than that of matrix if V f is above V crit . The higher the temperature, the lower the critical fiber volume fraction. For ZA22/Al2O3 short fiber composites, the value of the empirical parameter C * in Friend model decreases with the increasing temperature. |
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| Keywords: | ZA22 Al2O3 |
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