Abstract
The extra maxima appearing in the electron diffraction patterns from β -Cu-Zn-Al and β-Cu-Zn, following earlier considerations are to be attributed to surface martensite. The disappearance and reappearance of these extra maxima in alloys of different compositions indicate that surface martensite is stable at much higher temperatures than the corresponding bulk martensite and in addition, it can exist until ~470K in alloys in which no bulk martensitic transformations is known to occur. The microstructure of the surface martensite is studied in detail drawing attention to its similarities and differences with the bulk martensite. The “streaming” phenomenon is also considered and its origin is examined in the context of some earlier interpretations.
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