Tuning crystallographic compatibility to enhance shape memory in ceramics

Tuning crystallographic compatibility to enhance shape memory in ceramics
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调整晶体相容性以增强陶瓷的形状记忆

DOI:
10.1103/physrevmaterials.3.093603
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发表时间:
2019
影响因子:
3.4
通讯作者:
Quandt
Quandt
中科院分区:
材料科学3区
文献类型:
--
作者:
Jetter;Wuttig;Quandt

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形状记忆合金在大变形后恢复的非凡能力促使人们努力将这些特性转换到陶瓷上,这将使其在高温和恶劣环境下具有实用的形状记忆性能。利用机械相容理论预测了该体系中有前景的陶瓷候选材料。当满足这些相容条件时,在形状记忆效应中,热滞减小了2.5倍,变形能力增加了两倍,应变恢复提高了75%。这些发现表明,预测和优化陶瓷的化学成分以获得更好的晶体相容性是实现和提高其变形能力的有力工具,最终可能导致高度可逆的氧化物陶瓷形状记忆材料。
The extraordinary ability of shape-memory alloys to recover after large imposed deformation motivates efforts to transpose these properties onto ceramics, which would enable practical shape-memory properties at high temperatures and in harsh environments. The theory of mechanical compatibility was utilized to predict promising ceramic candidates in the system,. When these compatibility conditions are met, a reduction in thermal hysteresis by a factor of 2.5, a tripling of deformability, and a 75% enhancement in strain recovery within the shape-memory effect was found. These findings reveal that predicting and optimizing the chemical composition of ceramics to attain improved crystallographic compatibility is a powerful tool for enabling and enhancing their deformability that could ultimately lead to a highly reversible oxide ceramic shape-memory material.
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