Compressive behavior of high particle content B_4C/Al composite at elevated temperature  

高颗粒含量B_4C/Al复合材料的高温压缩力学行为(英文)

作　　者：刘斌[1] 黄文貌[1] 王浩伟[1] 汪明亮[1] 李险峰[1] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第10期2826-2832,共7页中国有色金属学报（英文版）

摘　　要：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.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。

关 键 词：B4C COMPOSITE compressive properties strain rate high temperature 

分 类 号：TB333[一般工业技术—材料科学与工程]