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22卷    第1期    总第154期    2012年1月

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文章编号:1004-0609(2012)1-0208-08
Ni75MnxAl25−x合金早期沉淀相的微观相场模拟
禚昌岩,王永欣,陈  铮,王晓鹏

(西北工业大学 凝固技术国家重点实验室,西安 710072)

摘 要: 采用三元微观相场动力学模型研究Ni75MnxAl25−x合金早期沉淀相的形成过程。对合金微观组织演化图像、有序相体积分数曲线、序参数曲线及占位几率的分析表明:该合金首先析出L10结构,随后L10结构向L12结构转变,L12结构在L10结构的内部析出。随着Al浓度的增大,等成分有序化阶段缩短;且L10结构体积分数增大,发生结构转变的时间提前。Al和Mn原子在(001)和(002)面几乎同时有序排列,但是一定时间后(002)面原子开始贫化,发生结构转变,Al原子主要占据b 位,Mn原子主要占据a位。合金最终析出单一的L12伪二元结构。

 

关键字: Ni75MnxAl25−x合金;微观相场;序参数;L10早期沉淀相

Microscopic phase-field simulation for formation of
pre-precipitation phase in Ni75Al25−xMnx alloy
ZHUO Chang-yan, WANG Yong-xin, CHEN Zheng, WANG Xiao-peng

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:The microscopic phase-field model was used to simulate the formation of pre-precipitation phase in Ni75Al25−xMnx alloy. The results of the microscopic morphology evolution of alloys, the volume fraction curves, order parameter curves and occupation probability show that L10 phase precipitates from the Ni75Al25−xMnx alloy first and then transforms into L12 phase inside of L10 phase in the following time. With the increase of Al concentration, the nucleation incubation periods of L10 and L12 phases and structure transformation time obviously become shorter. The ordering of Al and Mn atoms takes place in (001) and (002) planes simultaneously. As followed, the atom order degree begins to decrease in (002) planes and the structure is changed. Al atoms preferentially occupy the β site and Mn atoms preferentially occupy the a site. Finally, the L10 pseudobinary structure precipitates in the alloy system.

 

Key words: Ni75MnxAl25−x alloy; microscopic phase-field; order parameter; L10 pre-precipitation phase

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

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

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