In-situ observation of grain refinement dynamics of hypoeutectic Al-Si alloy inoculated by Al-Ti-Nb-B alloy

被引：136
作者：
Xu, Jin [1 ,2 ,3 ,4 ,5 ]
Li, Yang [1 ,2 ,3 ,4 ,5 ]
Ma, Ke [1 ,2 ,3 ,4 ,5 ]
Fu, Yanan [6 ]
Guo, Enyu [7 ]
Chen, Zongning [7 ]
Gu, Qinfen [8 ]
Han, Yuexing [9 ,10 ]
Wang, Tongmin [7 ]
Li, Qian [1 ,2 ,3 ,4 ,5 ]
机构：
[1] Shanghai Univ, Mat Genome Inst, Shanghai 200444, Peoples R China
[2] Shanghai Univ, Shanghai Inst Mat Genome, Shanghai 200444, Peoples R China
[3] Shanghai Univ, State Key Lab Adv Special Steels, Shanghai 200444, Peoples R China
[4] Shanghai Univ, Shanghai Key Lab Adv Ferromet, Shanghai 200444, Peoples R China
[5] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China
[6] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
[7] Dalian Univ Technol, Sch Mat Sci & Engn, Key Lab Solidificat Control & Digital Preparat Te, Dalian 116024, Peoples R China
[8] Australian Synchrotron ANSTO, 800 Blackburn Rd, Clayton, Vic 3168, Australia
[9] Shanghai Univ, Sch Comp Engn & Sci, Shanghai 200444, Peoples R China
[10] Shanghai Univ, Shanghai Inst Adv Commun & Data Sci, Shanghai 200444, Peoples R China
来源：
SCRIPTA MATERIALIA | 2020年 / 187卷
基金：
中国国家自然科学基金;
关键词：
Al-Si casting alloy; X-ray radiography; Grain refinement; Al-Ti-Nb-B; heterogeneous nucleation; MASTER ALLOYS; NUCLEATION; ALUMINUM; GROWTH;
D O I：
10.1016/j.scriptamat.2020.06.020
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The grain refining behaviour of a novel Al-Ti-Nb-B alloy in Al-Si melt with low cooling rate was in-situ observed by synchrotron radiography. Nucleation and growth of alpha-Al dendrites in the near-isothermal Al-8Si-7Cu melts inoculated by Al-1.67Ti-3.33Nb-0.5B and Al-5Ti-1B and were investigated. The evolution of grain number density and dendrite growth rate of alpha-Al were quantitatively studied, with which the significant difference in nucleation potencies between TiB2 and (Ti,Nb)B-2 in Al-Si melt was understood. The superior grain refining efficacy of the Al-1.67Ti-3.33Nb-0.5B alloy owes to the sufficient amount of (Ti,Nb)B-2 particles potent for both epitaxial nucleation and free growth. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：142 / 147
页数：6
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