Large elastocaloric effect in directionally solidified all-d-metal Heusler metamagnetic shape memory alloys

doi:10.1016/j.actamat.2020.02.045

CORC > 宁波材料技术与工程研究所 > 中国科学院宁波材料技术与工程研究所 > 2020专题

	Large elastocaloric effect in directionally solidified all-d-metal Heusler metamagnetic shape memory alloys
	Shen, Yi ; Wei, Zhiyang ; Sun, Wen ; Zhang, Yifei ; Liu, Enke ; Liu, Jian
刊名	ACTA MATERIALIA
	2020
卷号	188 页码:677-685
关键词	ORIENTATION CRYSTAL GIANT TRANSFORMATIONS EVOLUTION STRESS MICROSTRUCTURE HYSTERESIS MARTENSITE FILMS
DOI	10.1016/j.actamat.2020.02.045
英文摘要	Solid-state cooling based on the caloric effect of phase transformation materials has attracted considerable interest with the increased demand for energy-efficient and environmentally friendly cooling technologies. Here, we have systematically studied the microstructural evolution, martensitic transformation (MT) behaviors, and elastocaloric effect (eCE) of directionally solidified Ni(35)(.)(5)Co(14)(.)(5)Mn(35)Ti(15)( )all-d-metal Heusler metamagnetic shape memory alloys. Electron backscatter diffraction (EBSD) analysis revealed the coexistence of Heusler-type < 001 >-oriented dendritic crystal and Ti-poor interdendritic phase for as-solidified alloys. Upon homogenization annealing, the sample presents a columnar-like morphology with < 105 > textured five-layer-modulated (5 M) martensite along the growth direction. Besides, the multi-modulated martensite with 7 M and 8 M structures was identified by transmission electron microscopy (TEM). Using a unique technique of in situ digital image correlation (DIC) with the combination of infrared thermography, MT and eCE behaviors were studied. Ni35.5Co14.5Mn35Ti15 alloy yielded a large adiabatic temperature change (Delta T-ad) of 11.5 K with a low critical stress (sigma(cr)) of 38 MPa and a moderate stress hysteresis (Delta sigma(hy)) of 54 MPa when subjected to uniaxial stress, resulting in the largest value of vertical bar Delta T-ad/sigma(cr)vertical bar = 0.31 K MPa-1. This improved eCE is attributed to the enhanced compatibility in the oriented polycrystalline alloy and the high mobility of the low-energy twin boundary in the multi-modulated martensite. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
学科主题	Materials Science ; Metallurgy & Metallurgical Engineering
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/19789]
专题	2020专题
作者单位	1.Wei, ZY 2.Liu, J (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, CAS Key Lab Magnet Mat & Devices, Ningbo 315201, Peoples R China. 3.Liu, J (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Key Lab Magnet Mat & Applicat Techn, Ningbo 315201, Peoples R China.
推荐引用方式 GB/T 7714	Shen, Yi,Wei, Zhiyang,Sun, Wen,et al. Large elastocaloric effect in directionally solidified all-d-metal Heusler metamagnetic shape memory alloys[J]. ACTA MATERIALIA,2020,188:677-685.
APA	Shen, Yi,Wei, Zhiyang,Sun, Wen,Zhang, Yifei,Liu, Enke,&Liu, Jian.(2020).Large elastocaloric effect in directionally solidified all-d-metal Heusler metamagnetic shape memory alloys.ACTA MATERIALIA,188,677-685.
MLA	Shen, Yi,et al."Large elastocaloric effect in directionally solidified all-d-metal Heusler metamagnetic shape memory alloys".ACTA MATERIALIA 188(2020):677-685.