直流热机械测试（DC-TMT）：原理、不确定度层级及其在先进材料表征中的作用
Direct current thermo-mechanical testing: Principles, uncertainty hierarchy, and its role in advanced materials characterisation
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中文总结 AI 辅助
本综述针对DC-TMT缺乏标准化及被误作体等温测试的问题，整合相关研究分类不确定度源，评估其在多类材料中的应用，提出需透明报告等以支撑机制解读。
中文摘要 AI 辅助
基于电阻焦耳加热的直流热机械测试（DC-TMT）可实现快速升温和冷却、陡峭的热梯度以及同步机械加载，是探究常规炉基方法无法实现的条件下的变形、相变、氧化辅助损伤和蠕变的有力工具。尽管DC-TMT的应用日益广泛，但它缺乏正式标准化，常被误解为等同于体等温测试，忽略了热场和力场的固有差异。本综述通过整合四十年关于试样几何、温度测量、应变表征和环境控制的研究，将不确定度源分为主导、次要和条件三类，填补了这一空白。建模与实验证据表明，温度梯度、加热速率和标距段代表性决定了推断材料行为的可靠性。对其在铝、钢、镍基高温合金、钛合金、硬质合金、锆合金、形状记忆合金及增材制造体系中的应用进行了严格评估，强调了DC-TMT可提供可重复机制见解的领域，以及与体数据直接等效不成立的条件。研究意义包括需透明报告、多传感器温度验证，以及与电热建模集成，以实现严谨的、聚焦机制的解读。
英文摘要
Direct current thermo-mechanical testing (DC-TMT), based on resistive Joule heating, enables rapid heating and cooling, steep thermal gradients and simultaneous mechanical loading, making it a powerful tool for probing deformation, phase transformations, oxidation-assisted damage and creep under conditions inaccessible to conventional furnace-based methods. Despite its growing use, DC-TMT lacks formal standardisation and is often misinterpreted as equivalent to bulk isothermal testing, overlooking intrinsic differences in thermal and mechanical fields. This review addresses that gap by consolidating four decades of research on specimen geometry, temperature measurement, strain characterisation and environmental control, and by classifying uncertainty sources as dominant, secondary and conditional. Evidence from modelling and experiment shows that temperature gradients, heating rate and gauge representativeness govern the reliability of inferred material behaviour. Applications across aluminium, steels, nickel-based superalloys, titanium alloys, hardmetals, zirconium alloys, shape memory alloys and additively manufactured systems are critically assessed. The review highlights domains where DC-TMT provides reproducible mechanistic insight and conditions where direct equivalence with bulk data is not warranted. Implications include the need for transparent reporting, multi-sensor temperature validation and integration with electro-thermal modelling to enable rigorous, mechanism-focused interpretation.
发表机构
- National Physical Laboratory（英国国家物理实验室）
- Purdue University（普渡大学）
- Iowa State University（爱荷华州立大学）
- Federal University of Technology（联邦科技大学）
- University of Birmingham（伯明翰大学）
机构由 AI 辅助整理，请以论文原文为准。
