Design of (Hf,Ta)Fe2/Fe composite with zero thermal expansion covering room temperature
Design of (Hf,Ta)Fe2/Fe composite with zero thermal expansion covering room temperature
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DOI：
10.1016/j.scriptamat.2020.05.048
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发表时间：
2020-09-01
影响因子：
6
通讯作者：
Xu, Feng
中科院分区：
文献类型：
--
作者：
Cen, Dongyu;Wang, Bin;Xu, Feng
MgZn_2型（Hf，Ta）Fe_2是一个典型的负热膨胀体系，在冷却过程中，随着铁磁有序化的建立而膨胀。这种异常行为表明，（Hf，Ta）Fe-2是一种潜在的成分，以产生零热膨胀的复合材料。在这项工作中，我们发现铸态（Hf，Ta）Fe-2具有富铁晶界，退火后消失。这启发了我们在不退火的情况下，通过添加非化学计量比的Fe来制备（Hf，Ta）Fe-2/Fe复合材料。在仔细调整Hf/Ta比和Fe浓度后，在具有Hf0.80Ta0.20Fe2.5的成分的样品中实现了室温零热膨胀。(C)2020 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
MgZn2-type (Hf,Ta)Fe-2 is a typical negative-thermal-expansion system, which expands during the establishment of ferromagnetic ordering in cooling. This abnormal behavior suggests that (Hf,Ta)Fe-2 is a potential ingredient to produce a composite with zero thermal expansion. In this work, we find that the as-cast (Hf,Ta)Fe-2 have Fe-rich grain boundaries, which disappear after annealing. It inspires us to produce a (Hf,Ta)Fe-2/Fe composite by adding extra Fe in nonstoichiometric composition without annealing. After carefully tuning Hf/Ta ratio and Fe concentration, room-temperature zero-thermal-expansion is achieved in the sample with a composition of Hf0.80Ta0.20Fe2.5. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.