Elastocaloric effect in Ni50Fe19Ga27Co4 single crystals

Elastocaloric effect in Ni50Fe19Ga27Co4 single crystals
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Ni50Fe19Ga27Co4 单晶的弹热效应

DOI:
10.1016/j.actamat.2015.05.054
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发表时间:
2015-09
期刊:
影响因子:
9.4
通讯作者:
Xuejun Jin
Xuejun Jin
中科院分区:
材料科学1区
文献类型:
--
作者:
Fei Xiao;Mingjiang Jin;Jian Liu;Xuejun Jin

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[0 0 1] P和[1 1 1] P取向(下标P为母相)Ni 50 Fe 19 Ga 27 Co 4(at.%)的弹热效应已经在298-448 K的温度下在不同的压缩应力下研究了表现出一级马氏体转变的单晶。绝热温度变化Δ Tadi与晶体取向有显著的相关性。[0 0 1] Pone在32 8 ~ 398 K温度范围内,绝热消除应力30 0 MPa引起的温度下降达9-10 K,[1 1 1]Pone在Af附近约为3 K。应力诱发马氏体相变过程中的熵变是产生大的弹热效应的根本原因。在<1 1 2>3000次循环的疲劳试验中,累积缺陷如α/2L_(10)型位错是导致弹热效应衰减的主要原因。高比绝热温度(|ΔTadi/Δσ| 35 K/GPa),宽的比有效温度窗口(|ΔTwin/Δσ|在卸载过程中,[0 0 1] P取向的Ni 50 Fe 19 Ga 27 Co 4单晶在宽至50 K的温度范围内具有良好的热性能(COP ≤ 320 K/GPa)和高的热性能系数(COP ≤ 14),是一种潜在的弹热材料。
The elastocaloric effect of the [0 0 1]Pand [1 1 1]Porientated (subscript P represents the parent phase) Ni50Fe19Ga27Co4(at.%) single crystals exhibiting first-order martensitic transformations have been studied at temperatures of 298–448 K under different compressive stresses. The adiabatic temperature change ΔTadishows a significant dependence on the crystal orientation. The temperature decrease caused by adiabatic removal of stress 300 MPa reaches to about 9–10 K in a temperature range 328–398 K for [0 0 1]Pspecimen and 3 K at temperature nearAffor [1 1 1]Pone. The large elastocaloric effect is essentially attributed to the entropy change during the stress-induced martensitic transformation. The accumulated defect such as thea/2<1 1 2> L10type dislocation is the main reason for the attenuation of the elastocaloric effect in a fatigue test up to 3000 cycles. Large specific adiabatic temperature (|ΔTadi/Δσ| ≈ 35 K/GPa), wide specific effective temperature window (|ΔTwin/Δσ| ≈ 320 K/GPa) and high coefficient of performance (COP ≈ 14) in a temperature range as wide as 50 K during the unloading process enable the [0 0 1]Porientated Ni50Fe19Ga27Co4single crystal as a potential elastocaloric material.
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