高温合金中的拓扑密堆相:新相及畴结构

金属学报, 1986, 22(1): 1-43.

高温合金中的拓扑密堆相:新相及畴结构

中国科学院金属研究所

基金项目: 中国科学院科学基金

TOPOLOGICALLY CLOSE-PACKED PHASES IN SUPERALLOYS: New Phases and Domain Structures

YE Hengqiang , LI Douxing , GUO Kexin (Institute of Metal Research

<正> 一、引言高温合金中拓扑密堆相是众所周知的σ,Laves,μ,δ,P相等的总称。这些相由于使不锈耐热钢及高温合金变脆而引起人们的重视。高温合金的合金化程度高且较为复杂,成分控制或热处理不当都会导致拓扑密堆相析出,从而恶化材料的热强性及韧性。因此,在拓扑密堆相的形成条件(包括成分及加工热处理条件)、析出的动力学等方面都已经进行了大量的研究。拓扑密堆相的晶体结构研究则是这些工作的基础。早在1927年,Bain和Griffith就发现某些Fe-Cr合金变脆原因是由于有成份为FeCr的

1 Introduction2 Description of topologically close-packed structures2.1 Coordination polyhedra2.2 Atom layers2.3 Structure units2.4 Classification of phases3 Experimental high-resolution electron microscopy3.1 Preparation of specimens3.2 Imaging conditions of HREM images3.3 Micro and convergent beam electron diffraction4 New topologically close-packed metallic phases4.1 σ-related new phases: H, F, K, J phases4.2 Laves-related new phases: C, C_1 phases4.3 Summary5 Microdomain structures5.1 Domain structures in o-related phases: translation domain boundaries- {100}σ, {110}σ, {1(?)0}_H. (001)_H, boundary joints; rotation domains——28°-σ, 28°-H5.2 Domain structures in Laves-related phases: translation domain boundaries-(001)_μ, (001)_L, ((?)1)_L, (111)_μ, ((?)2)_μ, boundary joints; rotation domains; domains in C phase6 Antiprisms with long-range orientational order7 Conclusions

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