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Abstract: Alumina and carbon short fibers reinforced ZL109 aluminum
alloy hybrid composites are fabricated by preform squeeze-infiltrated
route. The friction and wear properties of the hybrid composites at
elevated temperature (≤400℃) are investigated. The results show that
wear rate of the hybrid composites is less than that of ZL109 matrix and
composites reinforced with only alumina or carbon fibre. The critical
transition temperature from mild wear to severe wear of the hybrid
composites was improved one time than that of monolithic ZL109 alloy
because of mutual effect of alumina and carbon short fibers. The friction
coefficient of the hybrid composites increases with the increase of
alumina fiber volume fraction when test temperature is below the
critical transition temperature. However, there exists critical value of
alumina fiber volume fraction which influences wear property of the
hybrid composites with the lowest wear rate at the volume fraction of
12%. The wear mechanisms of metal matrix and composites are ploughing
groove and slight adhesion when test temperature is below the critical
transition temperature. Whereas the wear mechanisms of matrix and
composites will be shifted to severe adhesion with the increase of test
temperature and beyond transition temperature.
Key words: Metal matrix hybrid composites Elevated temperature friction
and wear Wear mechanism
CLC No:
TB331
TH117
吉林省科技厅资助项目(963543). Received 20020717, received in
revised form 20030602
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