Abstract
Vickers microhardness analysis was carried out to identify the mechanical stability of the thiourea added L-histidine crystals (TLH) which were grown by slow evaporation solution growth technique at room temperature with different indentation loads. Indentation size effect (ISE) was investigated by analyzing the theoretical models. The microhardness values of the single crystal were calculated by using Meyer Law, proportional specimen resistance model, elastic/plastic deformation model and the Hays–Kendall (HK) approach. The results show that the HK approach is the most successful model to explain the deformations in the TLH single crystal. It is concluded that the RISE is a result of the specimen cracking during the indentation.
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