An analysis of microhardness of single-quasicrystals in the Al–Cu–Co–Si system

Microhardness tests were conducted on single grain quasicrystals of the decagonal phase in a Al–Cu–Co–Si system by varying the load from 15 to 500 g on the ten-fold plane and two-fold planes. Ultrasonic tests were also performed on ten-fold plane and its perpendicular planes. No significant difference was found in the microhardness and elastic properties measured on these two planes. The microhardness was found to be load dependent, varying …