合金
微观结构
材料科学
热的
违反直觉
大气温度范围
化学物理
航程(航空)
热膨胀
纳米技术
凝聚态物理
化学
热力学
冶金
复合材料
物理
量子力学
作者
Kun Lin,Wenbin Zhang,Chengyi Yu,Qiang Sun,Yili Cao,Wenjie Li,Suihe Jiang,Qiang Li,Qiang Zhang,Ke An,Yan Chen,Dunji Yu,Jue Liu,Kenichi Kato,Qinghua Zhang,Lin Gu,Xiaojun Kuang,Yu Tang,Jun Miao,Xianran Xing
标识
DOI:10.1016/j.xcrp.2023.101254
摘要
Chemical heterogeneity is usually avoided in solution chemistry, but it may still occur with sometimes dramatic effects on target materials and their properties. Here, we propose chemical heterogeneity as a counterintuitive strategy to design high-performance zero thermal expansion (ZTE) alloys. We apply this approach in a Hf-Ti-Fe alloy with excess Fe in the Hf/Ti sublattice and produce Hf/Ti concentration alternations at the micro level. Such chemical heterogeneity regulates local magnetic interactions in alloy and triggers a dispersed magnetic phase transition that modulates the thermal expansions at the micro level and hence results in a remarkable ZTE behavior over a super-wide temperature window from 10 to 480 K. This mechanism is supported by comprehensive studies on morphological microstructures, crystal and magnetic structures, and theoretical calculations. The strategy of local chemical heterogeneity opens up an avenue to design ZTE and the related functional materials directly via microstructure engineering.
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