metal matrix composite;
internal friction;
damage accumulation;
microplastic deformation;
D O I:
10.3989/revmetalm.2001.v37.i2.466
中图分类号:
TF [冶金工业];
学科分类号:
0806 ;
摘要:
The present Study has been undertaken to investigate the mechanism of thermal stress relief at the range of temperatures below room temperature for the metal matrix composite Al-Li 8090/SiC. For this aim the experimental technique of internal friction has been used which has been showed up very effective. Several thermal cycles from 453 K to 100 K were used in order to measure the internal friction as well as the elastic modulus of the material concluding that thermal stresses are relaxed by microplastic deformation around the reinforcements. It has been also related the variation in the elastic modulus with the different levels of precipitation.