Phase-Transition Energies, New Characterization of Solid Materials and Anisotropy

• 作者: Gerd Kaupp
• 来源期刊: 材料物理与化学进展(英文)
• 学科: 数学
• 关键词: Instrumented Indentation Loading Curve Phase Transition Onset and ENERGY Iteration-Less PLOT PHYSICAL EXPONENT Present ISO Standard ENERGY Law VIOLATIONS PHYSICAL Hardness Error Detections
• 年，卷（期）: clwlyhxjzyw_2019,（4）
• 页码范围: 57-70
• 页数: 14页
• 分类号: O1

摘要

Non-iterative analysis of indentation results allows for the detection of phase transitions under load and their transition energy. The closed algebraic equations have been deduced on the basis of the physically founded normal force ?depth3/2 relation. The precise transition onset position is obtained by linear regression of the FN = kh3/2 plot, where k is the penetration resistance, which also provides the axis cuts of both polymorphs of first order phase transitions. The phase changes can be endothermic or exothermic. They are normalized per μN or mN normal load. The analyses of indentation loading curves with self-similar diamond indenters are used as validity check of the loading curves, also from calibration standards that exhibit previously undetected phase-transitions and are thus incorrect. The phase-transition energies for fused quartz are determined from the loading curves from instrument provider handbooks. The anisotropic behavior of phase transition energies is studied for the first time. Quartz is a useful test object. The reasons for the packing-dependent differences are discussed on the basis of the local crystal structure under and around the inserting tip.