Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第8期    总第137期    2010年8月

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文章编号:1004-0609(2010)08-1591-08
TiVCrFe固溶体合金放氢过程中结构的变化
黄  倬1,F. CUEVAS2,刘晓鹏1,蒋利军1,王树茂1,M. LATROCHE2,杜  军1

(1. 北京有色金属研究总院 能源材料与技术研究所,北京 100088;
2. Chimie Métallurgique des Terres Rares - ICMPE - UMR7182 - CNRS, France
)

摘 要: 采用XRD、中子衍射、原位变温X射线衍射和热重分析对Ti29.25Cr26.59V37.25Fe6.91Ce1.10合金的放氢特性进行研究。结果表明:合金氘化物(平衡压为2 MPa)中主相金属原子占据4a位置,大部分氘占据8c位置,合金氘化物具有FCC结构。合金氢化物在放氢过程中发生两次相变,其中,在较低温度下发生的相变对应于含氢量高的β氢化物向含氢量低的α氢化物的转变,而在较高温度下的相变则对应于α氢化物向无氢BCC合金相的转变。β氢化物具有变形的FCC结构(P4/mmm),α氢化物具有BCT结构(I4/mmm)。

 

关键字: Ti-V固溶体合金;放氢过程;结构变化;原位变温XRD

Structure changes of TiVCrFe solid solution alloys
during desorption process
HUANG Zhuo1, F. CUEVAS2, LIU Xiao-peng1, JIANG Li-jun1, WANG Shu-mao1, M. LATROCHE2, DU Jun1

1. Institute of Energy Materials and Technology, General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. Chimie Métallurgique des Terres Rares-ICMPE-UMR7182-CNRS, France

Abstract:The desorption characteristics of Ti29.25Cr26.59V37.25Fe6.91Ce1.10 alloy hydride were investigated by XRD, neutron diffractometry, in-situ temperature dependent XRD and TG analysis. The results show that the metal atoms of the main phase and most deuterium atoms in deuteride (plateau pressure 2 MPa) occupy the 4a and 8c sites, respectively. The deuterides have FFC structure with space group . The two hydrides experience twice phase transformation during the desorption process. The phase change occurs at low temperature corresponding to the transformation of β hydride with high hydrogen content to α hydride with low hydrogen content, while the phase change occurs at high temperature corresponding to the transformation of α hydride to hydrogen-free BCC alloy. The β hydride in two samples have the same deformed FCC structure (SP: P4/mmm). The α hydride in Ti29.23Cr26.57V37.2Fe7.0Ce1.10 sample has BCT structure (SP: I4/mmm), while α hydride in Ti26.5V45Fe8.5Cr20Ce0.5 sample has BCC structure.

 

Key words: Ti-V based solid solution alloy; desorption process; structure change; in-situ temperature XRD

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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