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首页> 外文期刊>Materials Science and Engineering >Vickers microindentation deformation of different cleavage faces of potassium bichromate single crystals: Anisotropy in microhardness and crack formation
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Vickers microindentation deformation of different cleavage faces of potassium bichromate single crystals: Anisotropy in microhardness and crack formation

机译：钾二聚菌钾单晶不同裂解面的微观凸起变形：微硬度和裂缝形成的各向异性

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摘要

Experimental results of an investigation of anisotropy in microhardness measurements and crack formation on the {001}, {010} and {100} cleavage faces of potassium bichromate (KBC) single crystals by Vickers indentation deformation are presented and discussed. It was found that: (1) the experimental hardness H_V data measured at indentation loads P up to 0.6 N reveal two or three regions of indentation diagonal d characterized by load-independent, normal or reverse indentation size effect (ISE), (2) in the range of measurement of the different d regions the ISE behavior is associated with the competition between factors related to the material deformation and the crack formation during indentation, (3) the value of intrinsic hardness H_(in) of KBC crystal, independent of applied load, indenter orientation and plane used for hardness measurement in the region of normal ISE, is 0.764 GPa, (4) the values of fracture toughness K_c depend on the crystallographic orientation of the investigated cleavage face as well as on the orientation of the indenter on it, and (5) the anisotropy in the arrangement of indentation cracks on the cleavage faces is a consequence of anisotropic distribution of indentation stress due to the triclinic structure of KBC crystals.
机译：通过维氏压痕变形提出并讨论了通过维氏缩进变形的{001}，{010}和{100}单晶的{001}，{010}和{100}单晶的裂缝形成对微硬度测量和裂缝形成的实验结果。结果表明：（1）在压痕载荷P上测量的实验硬度H_V数据高达0.6 n显示由负载无关，正常或逆向压痕尺寸效应（ISE），（2）的缩进对角线D的两组或三个区域。（2）在不同D区的测量范围内，ISE行为与与材料变形的因素之间的竞争相关联，缩进期间的裂缝形成，（3）KBC晶体的固有硬度H_（IN）的值，独立于用于正常ISE区域的施加负荷，压紧取向和用于硬度测量的平面为0.764GPa，（4）断裂韧性K_c的值取决于所研究的裂解面的晶体取向以及压痕的取向在其上，（5）裂解面上压痕裂缝的排列的各向异性是由于KBC的三星性结构导致压痕应激的各向异性分布的结果水晶。

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