研究了快速凝固Ａｌ－Ｆｅ－Ｔｉ－Ｃ合金的显微结构及退火过程中的相变。初始快凝态组织由α－Ａｌ微胞晶组成，在胞晶边界分布着较大并拉长的非晶相；在胞晶内部则为细小弥散的球状亚稳Ａｌ_６Ｒｅ相（底心正交结构），Ｔｉ和Ｃ全部过饱和固溶于α－Ａｌ中。当７７３Ｋ退火５ｈ时，非晶相转变为α_Ｔ－ＡｌＦｅＳｉ相（斜方结构），Ａｌ_６Ｆｅ相部分转变为片状Ａｌ_３Ｆｅ相（底心单斜结构），部分长大但仍保持球状和底心正方结构过饱和固溶于α－Ａｌ基体中的Ｔｉ和Ｃ则以ＴｉＣ形式弥散析出。
The microstructure and phase transformation during annealing of rapidly solidified Al-Fe-Ti-C alloy have been studied by TEM,EDS and EELS.The initial microstructure consists mostly of α-Al,Al_6Fe particles and a smaller volume fraction of an amorphous phase.During annealing,the amorphous phase transforms into α_T-AlFeSi phase,the globular particles of Al_6Fe growth up and some needle-like Al_3Fe phase precipitates near the α-Al grain boundaries.At 673 K,96 h and 773 K,5 h annealing,the Ti and C dissolved in the α-Al during rapid solidification precipitates as a compound phase of TiC_079.And the formation process of TiC phase was discussed.Correspondent:TONG Xingcun,lecturer,Centre of Malerials Research,Zhengzhou Institute of Technology,Zhengzhou 450002
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