Fig. 2. TEM micrographs of 316L+1.5Y as-milled powder microstructure after milling.
(a) Bright field (BF)and (b) Dark field (DF) images with inset selected are a diffraction (SAD) pattern are shown. Resultsofstatistical analysis on several TEM dark field images yield an average grain size of _19nm.
(c) Indexed SAD pattern showing the presence of both austenite and martensite phases a troom temperature