Abstract
Polycrystalline Chemical Vapor Deposited (CVD) ZnS was subjected to post thermal treatments such as pressure less heat treatment (CVD + HT) and Hot Isostatic Pressing (CVD + HIP). The as deposited CVD, CVD + HT and CVD + HIP samples were characterized for their X-ray crystallographic micro-structural characteristics, followed by compressive and flexural strength measurements. ZnS material irrespective of the heat treatment showed an increase in peak compressive strength and a decrease in flexural stress in comparison to CVD samples. An attempt is made in this brief study to correlate the processes and associated micro-structural and crystallographic characteristics with observed strength properties. Detailed quantitative fractographic analysis reveals that ZnS material processed under all the three conditions fails by mixed fracture comprising of low degree of ductile, microdimples and transgranular shear fracture with predominant extent of low energy quasicleavage faceted fracture however, in case of as CVD specimens, the size of the quasi-cleavage facets are much finer.
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