AN ELECTRON DIFFRACTION ANALYSIS OF THE SECOND PHASES IN A 18Ni-Co-Mo-Ti MARAGING STEEL

The precipitates responsible for strengthening in a 18Ni-Co-Mo-Ti maragingsteel are Ni_3Ti and Ni_3Mo as identified by TEM. It should be pointed out thatusing selected-area diffraction patterns, the two precipitates were discerned sepa-rately only when certain specific orientations of the matrix crystal were chosen.The polygonal shape of the diffraction spots has been discussed in light of theshape factor effects of the Ni_3Mo particles.