SPS制备的NiTi合金的力学-微观结构关联
Mechanical-microstructural correlation on SPS-fabricated NiTi alloy
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中文总结 AI 辅助
本研究针对SPS制备的NiTi合金，建立了力学性能与微观结构的关联，明确了孔隙对超弹性响应及循环失效的影响，为其工程应用提供了性能-结构关联依据。
中文摘要 AI 辅助
对采用放电等离子烧结（Spark Plasma Sinter，SPS）制备的致密样品开展了力学性能测试与动态力学分析。研究发现，孔隙率较低的样品呈现超弹性响应行为，其他样品则在首次循环中发生失效，这可能与孔隙有关。金属粉末压制是粉末冶金领域制备块体材料的标准工艺之一，样品随烧结温度的致密化对最终致密化机制起关键作用，但烧结温度对致密化、微观结构、相变及力学性能的演变规律尚未得到充分揭示。本研究建立了致密样品力学性能与微观结构间的关联，讨论了致密样品的最大致密度及对应的微观结构、孔隙率、织构、相变、晶粒尺寸、硬度与力学性能，为NiTi合金在先进工程应用中的致密化建立了力学性能-结构关联。
英文摘要
Mechanical properties and dynamical mechanical analysis were performed on compact Spark Plasma Sinter samples. It has been observed that the sample with less porosity reflects the behavior of superelasticity response. Other samples show failure during first cycles that may be due to porosity. Compaction of metallic powder is one of the standard procedures in the field of powder metallurgy for the fabrication of bulk material. Consolidation of the sample as a function of sintering temperature plays a crucial role in the final compaction mechanism. However, the evolution of compaction, microstructure, phase transformation and mechanical properties as a function of sintering temperature is hardly disclosed. In this work, a correlation has been established between mechanical and microstructural properties of compact samples. The maximum compactness and the corresponding microstructure, porosity, texture, phase transformation, grain size, hardness, mechanical properties of compact samples were discussed. The research establishes mechanical properties-structure correlations for compaction of NiTi alloy in advanced engineering applications.
