met·al·log·ra·phy 
(mĕt′l-ŏgrə-fē)
(mĕt′l-ŏgrə-fē)n.
The study of the structure of metals and alloys, especially by optical and electron microscopy and x-ray diffraction.
met′al·logra·pher n.
me·tal′lo·graphic (mə-tăl′ə-grăfĭk) adj.
me·tal′lo·graphi·cal·ly adv.