Revisiting the role of peritectics in grain refinement of Al alloys

被引:195
作者
Wang, Feng [1 ]
Liu, Zhilin [1 ]
Qiu, Dong [1 ]
Taylor, John A. [1 ]
Easton, Mark A. [2 ]
Zhang, Ming-Xing [1 ]
机构
[1] Univ Queensland, Sch Mech & Min Engn, St Lucia, Qld 4072, Australia
[2] Monash Univ, Sch Mat Sci & Engn, Clayton, Vic 3800, Australia
基金
澳大利亚研究理事会;
关键词
Al alloys; Grain refinement mechanism; Peritectics; Growth restriction factor; Nucleant particles; CAST TITANIUM-ALLOYS; ALUMINUM-ALLOYS; MAGNESIUM ALLOYS; TI-B; NUCLEANT PARTICLES; SOLUTE CONTENT; SI ALLOYS; MECHANISM; INOCULATION; BORON;
D O I
10.1016/j.actamat.2012.09.075
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The grain refining effect of four peritectic-forming solutes (Ti, V, Zr and Nb) as well as three eutectic-forming solutes (Cu, Mg and Si) on pure Al was investigated. Significant grain refinement is observed by the addition of peritectic-forming solutes, whereas the addition of eutectic-forming solutes only slightly decreases the grain size. The mechanisms underlying the grain refinement of these alloys were then studied by a new analytical methodology for assessing grain refinement that incorporates the effects of both alloy chemistry and nucleant potency. It is found that the low degree of grain refinement by the addition of eutectic-forming solutes is mainly attributed to the segregating power of solutes, i.e. the constitutional undercooling contribution. However, peritectic-forming solutes do not only cause grain refinement by their segregation power but, more importantly, they introduce copious potent nuclei into the melt and promote significant grain refinement via heterogeneous nucleation. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:360 / 370
页数:11
相关论文
共 51 条
[1]  
Backerud L., 1991, Aluminum, V67, P780
[2]   Structural refinement of cast magnesium alloys [J].
Bamberger, M .
MATERIALS SCIENCE AND TECHNOLOGY, 2001, 17 (01) :15-24
[3]   DEVELOPMENT OF AL-TI-C GRAIN REFINERS CONTAINING TIC [J].
BANERJI, A ;
REIF, W .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1986, 17 (12) :2127-2137
[4]   GRAIN-REFINEMENT OF ALUMINUM BY TIC [J].
BANERJI, A ;
REIF, W .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1985, 16 (11) :2065-2068
[5]  
Bermingham MJ, 2008, J MATER RES, V23, P97, DOI [10.1557/jmr.2008.0002, 10.1557/JMR.2008.0002]
[6]   The mechanism of grain refinement of titanium by silicon [J].
Bermingham, M. J. ;
McDonald, S. D. ;
Dargusch, M. S. ;
StJohn, D. H. .
SCRIPTA MATERIALIA, 2008, 58 (12) :1050-1053
[7]   Beryllium as a grain refiner in titanium alloys [J].
Bermingham, M. J. ;
McDonald, S. D. ;
StJohn, D. H. ;
Dargusch, M. S. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 481 (1-2) :L20-L23
[8]   Segregation and grain refinement in cast titanium alloys [J].
Bermingham, M. J. ;
McDonald, S. D. ;
StJohn, D. H. ;
Dargusch, M. S. .
JOURNAL OF MATERIALS RESEARCH, 2009, 24 (04) :1529-1535
[9]   Mechanism for grain refinement of magnesium alloys by superheating [J].
Cao, Peng ;
Qian, Ma ;
StJohn, David H. .
SCRIPTA MATERIALIA, 2007, 56 (07) :633-636
[10]  
CIBULA A, 1951, J I MET, V80, P1