CAJ | 학술논문

利用Gleeble 3500热模拟机对高颗粒含量B4C/Al复合材料进行了温度范围为298~773 K，应变率范围为1×10?3~5 s?1的单轴压缩力学行为测试。结果表明：由于高颗粒含量B4C/Al复合材料在动态载荷和静态载荷作用下的破坏方式不同，导致了在高温条件下复合材料的动态强度随温度的下降速率要小于静态强度的下降速率。当温度从室温升高到773 K时，复合材料的应变率敏感指数从0.02增加到0.13，该现象表明，该高颗粒含量复合材料的应变率敏感指数是温度的函数。
이용Gleeble 3500열모의궤대고과립함량B4C/Al복합재료진행료온도범위위298~773 K，응변솔범위위1×10?3~5 s?1적단축압축역학행위측시。결과표명：유우고과립함량B4C/Al복합재료재동태재하화정태재하작용하적파배방식불동，도치료재고온조건하복합재료적동태강도수온도적하강속솔요소우정태강도적하강속솔。당온도종실온승고도773 K시，복합재료적응변솔민감지수종0.02증가도0.13，해현상표명，해고과립함량복합재료적응변솔민감지수시온도적함수。
The compressive properties of the aluminum matrix composite reinforced with 55%B4C (volume fraction) particles were characterized using Gleeble 3500 thermal-mechanical testing machine. The compressive stress-strain curves were obtained at the temperature ranging from 298 to 773 K and strain rate ranging from 1×10?3 to 5 s?1. The results showed that the dynamic compressive strength decreased more slowly than the quasi-static compressive strength at elevated temperatures, which was attributed to the different failure modes of the composite under dynamic and quasi-static load. The strain rate sensitivity increased from 0.02 to 0.13 when the temperature increased from room temperature to 773 K, suggesting that the strain rate sensitivity of this type of composite is a function of temperature.