Tailorable Thermal Expansion of Lightweight and Robust Dual-Constituent Triangular Lattice Material

热膨胀 材料科学 刚度 负热膨胀 材料性能 复合材料 格子(音乐) 六边形晶格 凝聚态物理 声学 物理 反铁磁性
作者
Kai Wei,Yong Peng,Weibin Wen,Yongmao Pei,Daining Fang
出处
期刊:Journal of Applied Mechanics [ASM International]
卷期号:84 (10) 被引量:66
标识
DOI:10.1115/1.4037589
摘要

Current studies on tailoring the coefficient of thermal expansion (CTE) of materials focused on either exploring the composition of the bulk material or the design of composites which strongly depend on a few negative CTE materials or fibers. In this work, an approach to achieve a wide range of tailorable CTEs through a dual-constituent triangular lattice material is studied. Theoretical analyses explicitly reveal that through rational arrangement of commonly available positive CTE constituents, tailorable CTEs, including negative, zero, and large positive CTEs can be easily achieved. We experimentally demonstrate this approach through CTE measurements of the specimens, which were exclusively fabricated from common alloys. The triangular lattice material fabricated from positive CTE alloys is shown to yield large positive (41.6 ppm/°C), near-zero (1.9 ppm/°C), and negative (−32.9 ppm/°C) CTEs. An analysis of the collapse strength and stiffness ensures the robust mechanical properties. Moreover, hierarchal triangular lattice material is proposed, and with certain constituents, wide range of tailorable CTEs can be easily obtained through the rationally hierarchal structure design. The triangular lattice material presented here integrates tailorable CTEs, lightweight characteristic, and robust mechanical properties, and is very promising for engineering applications where precise control of thermally induced expansion is in urgently needed.
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