The equiaxed-banded microstructural transition during low pressure plasma spraying

被引:24
作者
Baik, KH [1 ]
Grant, PS
Cantor, B
机构
[1] Chungnam Natl Univ, Dept Met Engn, Taejon 305764, South Korea
[2] Univ Oxford, Oxford Ctr Adv Mat & Composites, Oxford OX1 3PH, England
[3] Univ York, York YO10 5DD, N Yorkshire, England
基金
英国工程与自然科学研究理事会;
关键词
spray deposition; rapid solidification; plasma spraying; equiaxed structure; splat structure;
D O I
10.1016/j.actamat.2003.09.006
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The microstructure of low pressure plasma spray deposited Al-12%Si has been investigated as a function of temperature during spray deposition. concentrating on deposit homogeneity, porosity, microstructure and microhardness. The deposit microstructure was determined by the temperature during spray deposition. Low temperatures promoted inhomogeneous banded microstructures, incorporating partially solidified and unmelted particles, with high levels of intersplat porosity, extended Si solubility in the alpha-Al matrix, amorphous and nano-sized Si precipitates and relatively high microhardness. High temperatures promoted homogeneous equiaxed micro structures. with low porosity levels, low Si solubility in the alpha-Al matrix, micro-sized Si precipitates, and relatively low microhardness. The measured critical transition temperature was in the range 190-345 degreesC, in reasonable agreement with Cantor et al.'s intermixine model of microstructure formation during spray deposition, which predicted a critical transition temperature of 328 degreesC. The corresponding critical intersplat time was estimated to be 1.4 x 10(-4) s, indicating intermediate cooling conditions for splatting droplets arriving at the deposit surface. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:199 / 208
页数:10
相关论文
共 32 条
[1]   STRUCTURE AND STABILITY OF RAPIDLY SOLIDIFIED AL-SI BASED ALLOYS [J].
ANTONIONE, C ;
BATTEZZATI, L ;
MARINO, F .
JOURNAL OF MATERIALS SCIENCE LETTERS, 1986, 5 (05) :586-588
[2]   Microstructural evaluation of monolithic and continuous fibre reinforced Al-12wt.%Si produced by low pressure plasma spraying [J].
Baik, KH ;
Grant, PS .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 265 (1-2) :77-86
[3]  
BAIK KH, 1997, P 5 EUR C ADV MAT PR, V1, P341
[4]   HEAT-TRANSFER ASPECTS OF SPLAT-QUENCH SOLIDIFICATION - MODELING AND EXPERIMENT [J].
BENNETT, T ;
POULIKAKOS, D .
JOURNAL OF MATERIALS SCIENCE, 1994, 29 (08) :2025-2039
[5]  
BEWLAY BP, 1986, INT J RAPID SOLIDIF, V2, P107
[6]   THE RELATIONSHIP BETWEEN THERMAL HISTORY AND MICROSTRUCTURE IN SPRAY-DEPOSITED TIN-LEAD ALLOYS [J].
BEWLAY, BP ;
CANTOR, B .
JOURNAL OF MATERIALS RESEARCH, 1991, 6 (07) :1433-1454
[7]   MODELING OF SPRAY DEPOSITION - MEASUREMENTS OF PARTICLE-SIZE, GAS VELOCITY, PARTICLE-VELOCITY, AND SPRAY TEMPERATURE IN GAS-ATOMIZED SPRAYS [J].
BEWLAY, BP ;
CANTOR, B .
METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY, 1990, 21 (05) :899-912
[8]   Microstructural characterization of a rapidly-solidified Al-12 wt% Si alloy [J].
Birol, Y .
JOURNAL OF MATERIALS SCIENCE, 1996, 31 (08) :2139-2143
[9]  
BRANES EA, 1992, SMITHELLS METALS REF
[10]   Development of microstructure in spray formed alloys [J].
Cantor, B ;
Baik, KH ;
Grant, PS .
PROGRESS IN MATERIALS SCIENCE, 1997, 42 (1-4) :373-392