相变能,固体材料的新特性和各向异性

G. Kaupp
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引用次数: 6

摘要

压痕结果的非迭代分析允许检测负载下的相变及其转变能量。在物理建立的法向力-深度3/2关系的基础上,推导了闭合代数方程。精确的转变起始位置是通过FN=kh3/2图的线性回归获得的,其中k是穿透阻力,这也提供了一阶相变的两种多晶型的轴切。相变可以是吸热的,也可以是放热的。它们按照μN或mN的正常负载进行归一化。使用自相似金刚石压头对压痕载荷曲线的分析被用作载荷曲线的有效性检查,也来自于之前未检测到的相变的校准标准,因此是不正确的。熔融石英的相变能由仪器供应商手册中的加载曲线确定。首次研究了相变能的各向异性行为。石英是一种有用的测试对象。根据插入尖端下方和周围的局部晶体结构,讨论了产生堆积相关差异的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phase-Transition Energies, New Characterization of Solid Materials and Anisotropy
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.
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