Abstract:The ordering of bainite is studied and compared with that of martensite in a Cu-20Zn-6Al(wt—％) alloy by X-ray analysis. Experilnental results show that in contrast with the diffraction pattern for 9R or 18R martensite, in which the (115) diffraction peak is distinguishable from the (2 0 5), and the (1 2 10) from the (2 0 10), the (1 1 5) and (2 0 5) or the (1 2 10) and (2 0 10) diffraction peaks in the bainites formed from high temperature B2 or low temperature L2 parent phase overlap, and these phenomena do not change after prolonged aging or slow-cooling. The bainite structure is quite different from that of the martensite, i. e., the inheritance of the ordering of the parent phase would not occur, during bainite formation.

Key words: Cu-Zn-Al alloy marensite bainite ordering