摘要
The aging characteristics of as-quenched microstructures of ZA-27 alloy and SiCp/ZA-27 composite(ZMCp) were investigated using SEM, EDS and TEM. The structure, morphology and size of sub-grains in primary dendrite in ZMCp continuously change during aging process. Little tiny spherical Zn-rich η phase distributes in the dendrite. Amount of transitional α′phase, well coherent with equilibrium αf phase, in SiCp-neighboring dendrite edge zone is less than that in dendrite center zone. Both eutectic and peritectic β phase transform into lamellar α and η phases, obeying [ 2113]η∥[110]α, and (002)α∥ (1 101)η. In the like-eutecticum of ZMCp, less amount of β phase and decomposition products are found. The size of α phase decomposed from peritectic β phase in ZMCp is obviously larger than that in the monolithic alloy. The lamella decomposition of β phase beside SiCp is evidently more rapid than that in the alloy. SiC particulates strongly accelerate neighboring β phase decomposition in aging process.
The aging characteristics of as-quenched microstructures of ZA-27 alloy and SiCp/ZA-27 composite（ZMCp） were investigated using SEM, EDS and TEM. The structure, morphology and size of sub-grains in primary dendrite in ZMCp continuously change during aging process. Little tiny spherical Zn-rich η phase distributes in the dendrite. Amount of transitional a＇ phase, well coherent with equilibrium αf phase, in SiCp-neighboring dendrite edge zone is less than that in dendrite center zone. Both eutectic and peritectic β phase transform into lamellar a and η phases, obeying [2113] η//[ 110]α, and （002）α//（1 1 01）η In the like-eutecticum of ZMCp, less amount of β phase and decomposition products are found. The size of α phase decomposed from peritectic β phase in ZMCp is obviously larger than that in the monolithic alloy. The lamella decomposition of β phase beside SiCp is evidently more rapid than that in the alloy. SiC particulates strongly accelerate neighboring β phase decomposition in aging process.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2006年第1期98-104,共7页
Transactions of Nonferrous Metals Society of China
基金
Project(03G52047) supported by the Aviation Science Foundation, China
关键词
金属基复合材料
碳化硅
SEM
EDS
TEM
显微结构
SiCp/ZA-27 composite
aging microstructure
ZA-27 alloy
precipitation
crystallographic orientation relationship
