摘要
采用挤压铸造法制备了铁基多孔预制件增强铝基复合材料，并对其进行T6处理，通过对该材料进行压缩性能测试，获得材料在不同应变率下的应力-应变曲线，对曲线和压缩后试样的形貌进行分析。结果表明：应改变率为0．001~10s-1，材料对应变率的变化不敏感，其峰值应力基本保持在600MPa；应变率为1000—2700s-1，材料对应变率的变化也不敏感，峰值应力基本保持在700MPa；当应变率从10s。提高到1000s-1，材料的变形方式发生改变，峰值应力提高，试样压缩后的形貌由剪切断裂转变为仅发生塑性变形。应变率为1000～2700s-1，材料的应力一应变曲线上存在很长的平台应力，且随应变率的增加平台变宽，说明该材料具有很好的能量吸收能力。
Squeeze casting process was adopted to produce the Fe matrix porous Administrator reinforced aluminum composite. After heat treated by T6, the composite was compressed under different strain rate. From the obtained true stress - true strain curves and the compressed samples, it is found that, in the range of strain rate 0.001 s-1 to 10 s-l, the composite is not sensitive to the change of strain rate, and its peak stress keeps at about 600 MPa. Similarly, in the range of strain rate 1 000 s-1 to 2 700 s-1, the composite is also not sensitive to the change of strain rate, and its peak stress keeps at about 700 MPa. However, when the strain rate is elevated from 10 s-3 to 1 000 s-1, the deformation mode of compressed samples changes from shear fracture to plastic deformation, the peak stress increases. From the true stress-true strain curves from 1 000 s-1 to 2 700 s-1, it is also found that there exists very long stress platform which is a reflection of good capability of energy absorption.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2015年第5期1-4,共4页
Ordnance Material Science and Engineering
基金
国家国际科技合作专项项目(2013DFA51230)
浙江省重中之重学科开放基金项目(zj1226)
宁波市国际科技合作项目(2012D10004)
关键词
挤压铸造
铁基多孔预制件
复合材料
压缩
应变率
squeeze casting
Fe matrix porous preform
composite
compression
strain rate
