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Metal matrix composites; strengthening; work hardening rate; dislocation density

The strengthening of particulate reinforced metal-matrix composites is associated with a high dislocation density in the matrix due to the difference in coefficient of thermal expansion between the reinforcement and the matrix. While this is valid, the role of work hardening characteristics of the matrix alloys in strengthening of these composites is addressed in the present paper. It is found that commercial purity aluminium which has the lowest work hardening rate exhibits the highest strength increment. This effect is due to increased prismatic punching of dislocations. This relationship of decreasing work hardening rate associated with increasing prismatic punching of dislocations in the order 7075, 2014, 7010, 2024, 6061 and commercial purity aluminium leading to increased strength increments is noted.

K T Kashyap¹ C Ramachandra¹ C Dutta¹ B Chatterji¹

1. Central Materials and Process Laboratory, Hindustan Aeronautics Limited, Bangalore - 560 017, India

Published

February 2000

Manuscript received

16 September 1999

Manuscript revised

6 January 2000