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a l s o , they revealed the absence of anti-phase bounda r i e s , implying that each g r a i n is a separate domain. G r a i n sizes were determined using the method of l i n e a r intercepts, the a v e r a g e intercept distance, d, r a t h e r than the a v e r a g e g r a i n diameter b e i n g obtained. Those in e x c e s s of 5 /zm were measured by optical microscopy; f i n e r s i z e s were determined from t r a n s mission electron microscopy of thin f o i l s by examining at l e a s t 100 g r a i n s . In counting intercepts, the bounda r i e s of annealing twins were not included, because they do not impede slip in Zr3A1.4 Macrohardness measurements were made on e l e c trochemically polished surfaces by mounting specimens of dimensions ~5 >