Heterogeneous nucleation models to predict grain size in solidification

等轴晶 成核 过冷 材料科学 奥斯特瓦尔德成熟 热力学 晶体生长 粒度 Crystal(编程语言) 化学物理 晶粒生长 冶金 微观结构 纳米技术 化学 物理 计算机科学 程序设计语言
作者
Sung Bae Park
出处
期刊:Progress in Materials Science [Elsevier BV]
卷期号:123: 100822-100822 被引量:25
标识
DOI:10.1016/j.pmatsci.2021.100822
摘要

Heterogeneous nucleation models in solidification have been developed to predict grain size over several decades. Up to now, the models are divided into three categories. The first is a well-known spherical cap nucleus model, where the effectiveness of nucleant, i.e. contact angle, is mainly focused on characterising the nucleants. In this model, the kinetics is determined by activation energy of embryos formation and the adsorption rate of atoms into the embryos. The second is a free growth model, in which active nucleants are determined by the size distribution of nucleants, and the heterogeneous nucleation is considered as an athermal process. The third is a constitutional supercooling model in which active nucleants are triggered by the constitutional undercooling at the front of growing crystals. All models remain uncertain to describe constitutionally the kinetics of heterogenous nucleation. In addition, the crystal growth rate affects significantly the heterogeneous nucleation events since growing crystals release solute atoms and heat. Therefore it is very important to approximate a flux of solute at the solid–liquid interface. In practical aspect, how to predict the grain size in the equiaxed zone is of interest. Equiaxed grains in front of growing columnar block the growth when the volume of equiaxed grains reaches a critical value, and eventually equiaxed zones are formed, i.e. columnar to equiaxed transition (CET). It is believed that the grain size in the equiaxed zone can be predicted using the cooling rate of remained melt at the time when CET occurs. In addition, further investigations on the efficiency variation of grain refiner are also required, although it is agreed that the efficiency decreases significantly with increasing amounts of nucleant.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
hhhblabla应助积极的初南采纳,获得20
1秒前
watermelon完成签到,获得积分10
2秒前
桐桐应助暴躁小龙采纳,获得10
8秒前
12秒前
13秒前
蓬松小面包完成签到 ,获得积分20
14秒前
bkagyin应助大白采纳,获得10
14秒前
14秒前
量子星尘发布了新的文献求助10
15秒前
收集快乐发布了新的文献求助10
16秒前
bsf123完成签到,获得积分10
16秒前
17秒前
DeepLearning发布了新的文献求助10
19秒前
19秒前
科研通AI2S应助细辛采纳,获得10
19秒前
20秒前
20秒前
俭朴依白完成签到,获得积分10
20秒前
ElbingX完成签到,获得积分10
22秒前
暴躁小龙发布了新的文献求助10
23秒前
文档发布了新的文献求助10
24秒前
24秒前
严溯发布了新的文献求助10
25秒前
25秒前
27秒前
momo发布了新的文献求助10
27秒前
不可思宇完成签到,获得积分10
28秒前
28秒前
浩浩发布了新的文献求助10
29秒前
Philip发布了新的文献求助10
30秒前
31秒前
赘婿应助SherlockHe采纳,获得10
31秒前
橘子的角动量完成签到,获得积分10
32秒前
严溯完成签到,获得积分10
33秒前
34秒前
胡航航发布了新的文献求助20
34秒前
雨的痕迹发布了新的文献求助10
35秒前
AnnieSsy完成签到,获得积分10
35秒前
程程发布了新的文献求助10
36秒前
浩浩完成签到,获得积分10
37秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3989297
求助须知:如何正确求助?哪些是违规求助? 3531418
关于积分的说明 11253893
捐赠科研通 3270097
什么是DOI,文献DOI怎么找? 1804884
邀请新用户注册赠送积分活动 882087
科研通“疑难数据库(出版商)”最低求助积分说明 809158