Phase selection and microstructure of slowly solidified Al-Cu-Fe alloys

被引：6

作者：

Kamaeva, L. V. ^{[1
,2
]}

Sterkhova, I. V. ^{[1
]}

Lad'yanov, V. I. ^{[1
]}

Ryltsev, R. E. ^{[2
,3
,4
]}

Chtchelkatchev, N. M. ^{[2
,4
,5
]}

机构：

[1] Russian Acad Sci, Ural Branch, Udmurt Fed Res Ctr, Izhevsk 426068, Russia

[2] Russian Acad Sci, Vereshchagin Inst High Pressure Phys, Moscow 108840, Russia

[3] Russian Acad Sci, Ural Branch, Inst Met, Ekaterinburg 620016, Russia

[4] Ural Fed Univ, Ekaterinburg 620002, Russia

[5] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia

来源：

JOURNAL OF CRYSTAL GROWTH | 2020年 / 531卷

基金：

俄罗斯科学基金会;

关键词：

Phase equilibria; Solidification; Computer simulation; Phase diagrams; Growth from melt; Al-Cu-Fe alloys; ICOSAHEDRAL QUASI-CRYSTAL; MG-AL; MORPHOLOGY;

D O I：

10.1016/j.jcrysgro.2019.125318

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The search for effective methods to fabricate bulk single-phase quasicrystalline Al-Cu-Fe alloys is currently an important task. Crucial to solving this problem is to understand the mechanisms of phase formation in this system. Here we study the crystallization sequence during solidification as well as the conditions of solid phase formation in slowly solidified Al-Cu-Fe alloys in a wide range of compositions. We have also constructed concentration dependencies of undercoolability by differential thermal analysis method. These experimental results are compared with data on chemical short-range order in the liquid state determined from ab initio molecular dynamic simulations. We observe that the main features of interatomic interaction in the Al-Cu-Fe alloys are similar for both liquid and solid states and they change in the vicinity of i-phase composition. In the concentration region, where the i-phase is formed from the melt, both the undercoolability and the crystallization character depend on the temperature of the melts before cooling.

引用

页数：4

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