电场对定向凝固类包晶合金凝固组织的影响

doi:10.11901/1005.3093.2020.136

材料研究学报

2022, Vol. 36

Issue (7): 545-551 DOI: 10.11901/1005.3093.2020.136

研究论文

本期目录 | 过刊浏览

电场对定向凝固类包晶合金凝固组织的影响

王国田¹(

), 王强¹, 郭建华¹, 丁宏升², 孙宏喆²

^1.黑龙江工程学院汽车与交通工程学院哈尔滨 150050
^2.哈尔滨工业大学材料科学与工程学院金属精密热加工国家重点实验室哈尔滨 150001

Effect of Electric Field on Solidification Structure of Directionally Solidified Peritectic Alloys

WANG Guotian¹(

), WANG Qiang¹, GUO Jianhua¹, DING Hongsheng², SUN Hongzhe²

^1.College of Automobile and Transportation Engineering, Heilongjiang Institute of Technology, Harbin 150050, China
^2.National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

引用本文:

王国田, 王强, 郭建华, 丁宏升, 孙宏喆. 电场对定向凝固类包晶合金凝固组织的影响[J]. 材料研究学报, 2022, 36(7): 545-551.
Guotian WANG, Qiang WANG, Jianhua GUO, Hongsheng DING, Hongzhe SUN. Effect of Electric Field on Solidification Structure of Directionally Solidified Peritectic Alloys[J]. Chinese Journal of Materials Research, 2022, 36(7): 545-551.

全文: PDF(13969 KB) HTML

摘要:

为研究直流电流对亚包晶合金凝固过程的影响,选用与亚包晶合金都存在相似凝固过程的AMPD-4.1%SCN透明亚包晶模拟物为研究对象。使用显微镜感光器件(CCD)和智能通讯测温仪表对实验过程进行实时拍照和温度记录,研究了亚包晶透明模拟物在电场作用下的结晶过程和晶体生长规律。结果表明：在电场的作用下,由电迁移效应使定向结晶的亚包晶模拟物的初生β相颗粒逐渐向正极方向迁移,使凝固界面前沿的液相成分与包晶点的成分(0.05%SCN,原子分数)接近,从而促进包晶反应的进行；电场的作用使电流偏聚产生的焦耳热效应和溶质富集引起的成分过冷,使定向凝固的枝晶尖端产生特殊分裂的生长形貌,使枝晶尖端分裂,枝晶间距减小。

关键词 ：金属材料, DC定向凝固, 类包晶合金, 凝固界面

Abstract：

It is known that the AMPD-4.1% SCN (Aminomethyl Propanediol-4.1% Succinonitrile) transparent hypoperitectic polymer alloy and the Ni₃Al hypoperitectic alloy present the similarity in directional solidification behavior, therefore, the former was selected as the reference material to simulate the effect of DC current on the directional solidification process of the later one. During the experiment, the real-time photo shooting and real-time temperature recording were carried out by the microscope photosensitive device (CCD) and an intelligent communication temperature measuring instrument. The results show that under the action of electric field, the primary β phase particles of the directionally crystallized subperitectic alloy migrate to the positive pole, which facilitates the peritectic reaction by making the composition of liquid phase near peritectic point at the frontier of solidification interface. The special growth morphology of dendrite tip splitting and the dendrite spacing decreasing of directionally solidified dendrite tip under the action of electric field may be mainly caused by Joule heating effect caused by electric field and supercooling caused by solute enrichment. Last but not least, results of the similar experiment for Ni₃Al-based alloy Ni-20Al-10Fe-0.2B proved fairly well the above observed growth morphology of the AMPD-4.1% SCN transparent hypoperitectic polymer alloy.

Key words： metallic materials DC directional solidification peritectic alloy solidification interface

收稿日期: 2021-04-24

ZTFLH:

TG244.3

基金资助:国家自然科学基金(51471062);黑龙江工程学院博士基金(2019BJ03);黑龙江省省属本科高校基本科研业务费科研项目(2021GJ10);黑龙江省领军人才梯队培育计划(2020LJ04)

作者简介: 王国田,男,1978年生,博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.136 或 https://www.cjmr.org/CN/Y2022/V36/I7/545

图1 AMPD-SCN的平衡转变相图[20]

表1 包晶合金模拟物的物性参数[20,22]

图2 物理模拟的装配图

图3 AMPD-4.1%SCN凝固初期的组织形态

图4 在1.2 mA 直流电流的作用下亚包晶模拟物定向凝固结晶生长的形貌

图5 亚包晶模拟物定向凝固生长形貌

图6 在1.2 mA电流专用下亚包晶模拟物的定向结晶形貌

图7 电流在固相中偏聚的示意图

图8 直流电流影响枝晶尖端形貌演变的原理

图9 枝晶尖端分裂的原理

图10 在电流作用下Ni-20Al-10Fe-0.2B定向凝固的最初阶段和枝晶分裂阶段

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