Effect of Cr addition on the formation of the decagonal quasicrystalline phase of a rapidly solidified Al-Ni-Co alloy

被引：17

作者：

Wolf, W. ^{[1
]}

Sitta, B. O. ^{[2
]}

Martini, L. M. ^{[2
]}

Jorge, A. M., Jr. ^{[2
]}

Bolfarini, C. ^{[2
]}

Kiminami, C. S. ^{[2
]}

Botta, W. J. ^{[2
]}

机构：

[1] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, Rod Washington Luiz,Km 235, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Fed Sao Carlos, Dept Engn Mat, Rod Washington Luiz,Km 235, BR-13565905 Sao Carlos, SP, Brazil

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 707卷

基金：

巴西圣保罗研究基金会;

关键词：

Quasicrystals; TEM; X-ray diffraction; Rapid solidification; TRANSITION-METALS; ALUMINUM; SYSTEMS;

D O I：

10.1016/j.jallcom.2016.10.050

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of Cr addition in a rapidly solidified Al-Ni-Co alloy was investigated. Melt spun samples of atomic composition Al71Ni20Co9, Al72Ni19Co7Cr2 and Al72Ni20Co5Cr3 were studied by X-ray diffraction and transmission electron microscopy. Aiming to develop quasicrystalline compositions enriched in corrosion resistant elements such as Cr and Ni this work presents, for the first time, the effect of Cr addition on the quasicrystalline phase formation of a high-Ni Al-Ni-Co rapidly solidified alloy chosen to be within the range of formation of the decagonal quasicrystalline phase observed in this ternary system. The composition of the quaternary alloys was chosen by reducing the Co content in favor of Cr on the ternary alloy and keeping the average valence electron per atom (e/a) around 1.86. The phase constitution of the ternary alloy consisted of the decagonal phase along with two intermetallic phases, Al3Ni and Al3Ni2. The addition of Cr resulted in the formation of a second quasicrystalline decagonal phase, rich in Cr. This was due to the low Cr solubility on the ternary Al-Ni-Co decagonal and intermetallic phases, which rejected Cr and resulted on the formation of the Cr-rich quasicrystal. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：41 / 45

页数：5

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