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首页> 外文期刊>Scientific reports. >Ti 2 NiCoSnSb - a new half-Heusler type high-entropy alloy showing simultaneous increase in Seebeck coefficient and electrical conductivity for thermoelectric applications
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Ti 2 NiCoSnSb - a new half-Heusler type high-entropy alloy showing simultaneous increase in Seebeck coefficient and electrical conductivity for thermoelectric applications

机译：Ti 2 NicosnsB - 一种新的半空置式高熵合金，显示热电应用的塞贝克系数和电导率的同时增加

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摘要

A new single phase high entropy alloy, Ti2NiCoSnSb with half-Heusler (HH) structure is synthesized for the first time by vacuum arc melting (VAM) followed by ball-milling (BM). The BM step is necessary to obtain the single phase. Local electrode atom probe (LEAP) analysis showed that the elements are homogeneously and randomly distributed in the HH phase without any clustering tendency. When the BM was carried out for 1?hour on the VAM alloy, microcrystalline alloy is obtained with traces of Sn as secondary phase. When BM was carried out for 5?h, single HH phase formation is realized in nanocrystalline form. However, when the BM samples were subjected to Spark plasma sintering (SPS), secondary phases were formed by the decomposition of primary phase. Nanostructuring leads to simultaneous increase in S and σ with increasing temperature. The micro (1?h BM-SPS) and nanocrystalline (5?h BM-SPS) alloys exhibited a power factor (S2σ) of 0.57 and 1.02?mWm?1K?2, respectively, at 860?K. The microcrystalline sample had a total thermal conductivity similar to bulk TiNiSn sample. The nanocrystalline alloy exhibited a ZT of 0.047 at 860?K. The microcrystalline alloy showed a ZT to 0.144 at 860?K, in comparison to the nanocrystalline alloy.
机译：新的单相高熵合金，Ti2nicosnsB与半空间器（HH）结构合成，首次通过真空电弧熔化（VAM）合成，然后进行球磨（BM）。 BM步骤是获得单相的必要条件。局部电极原子探针（LEAP）分析表明，元素均匀地和随机分布在HH相中，没有任何聚类趋势。当BM在VAM合金上进行1？小时时，用Sn的痕量作为二级相获得微晶合金。当BM进行5μl时，以纳米晶形式实现单个HH相形成。然而，当对BM样品进行火花等离子体烧结（SPS）时，通过分解初级相的分解形成二次相。纳米结构导致S和σ同时增加，温度升高。微（1·H BM-SPS）和纳米晶（5ΩHBM-SPS）合金显示出0.57和1.02Ω·mWMα的功率因数（S2σ），分别为860Ω·k。微晶样品具有类似于Bulk Tinisn样品的总热导率。纳米晶合金在860Ω·k下表现出0.047的ZT。与纳米晶合金相比，微晶合金显示为860 k的Zt至0.144。

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