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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第5期    总第158期    2012年5月

[PDF全文下载]        

    

文章编号:1004-0609(2012)05-1304-07
Pb-Bi包晶合金定向凝固相和组织选择
胡小武1,闫  洪1,陈文静2,李双明3,傅恒志3

(1. 南昌大学 机电工程学院,南昌 330031;2. 西北工业大学 理学院,西安 710072;
3. 西北工业大学 凝固技术国家重点实验室,西安 710072
)

摘 要: 针对Pb-Bi包晶合金中高速及低速定向凝固,利用最高界面生长温度判据以及充分形核和成分过冷准则,对Pb-Bi包晶合金定向凝固中初生α和包晶β两相的相互竞争规律进行预测。计算结果表明:在中高速凝固段,与Pb-26%Bi、Pb-28%Bi、Pb-30%Bi和Pb-34%Bi(质量分数)合金对应的α→β转变的临界生长速度分别为20、14、8.5和2 mm/s;在低速凝固段,合金的相选择图分为8个生长区,其中包括两相分别以单相生长区及两相混合生长区。利用该相选择图,结合温度梯度与凝固速度比值(G/V)及合金原始成分(C0)可预测相选择规律及组织形态。

 

关键字: Pb-Bi合金;包晶合金;定向凝固;相选择

Phase and microstructure selection in directional solidification of Pb-Bi peritectic alloys
HU Xiao-wu1, YAN Hong1, CHEN Wen-jing2, LI Shuang-ming3, FU Heng-zhi3

1. School of Mechanical-Electrical Engineering, Nanchang University, Nanchang 330031, China;
2. School of Science, Northwestern Polytechnical University, Xi’an 710072, China;
3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:Based on the directional solidification of Pb-Bi peritectic alloys with moderate or high and low growth velocities, the competition between the primary α and peritectic β phases was predicted by using the highest interface growth temperature criterion and the nucleation and constitutional undercooling criterion, respectively. The calculated results show that the critical growth velocities for α→β transition under moderate/high growth velocities are 20, 14, 8.5 and 2 mm/s for Pb-26%Bi, Pb-28%Bi, Pb-30%Bi and Pb-34%Bi (mass fraction) alloys, respectively. For the low growth velocities, the phase selection map is divided into 8 growth zones including the single phase growth zone and the growth zone of two phases mixed. The phase selection and microstructure morphology can be predicted by using the phase selection map combined with solidification rate ratio (G/V) and initial content of the alloy (C0).

 

Key words: Pb-Bi alloy; peritectic alloy; directional solidification; phase selection

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com