Effect of Zr-content on the oxidation and phase transformation of Zr-base amorphous alloys in air

被引:36
作者
Hsieh, HH [1 ]
Kai, W
Huang, RT
Pan, MX
Nieh, TG
机构
[1] Natl Taiwan Ocean Univ, Inst Mat Engn, Chilung 20224, Taiwan
[2] Natl Tsing Hua Univ, Dept Engn & Syst Sci, Hsinchu 30013, Taiwan
[3] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
关键词
oxidation; phase transformation; glasses; metallic;
D O I
10.1016/j.intermet.2004.04.024
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 oxidation and phase transformation of three Zr-base amorphous alloys, Zr-20Cu-12Ni-10A1-5Ti (Zr53), Zr-30Cu-10Al-5Ni (Zr55), and Zr-15Cu-10Al-10Ni (Zr65), were studied over the temperature range of 300-500degreesC in dry air. Oxidation kinetics of these alloys generally followed a parabolic rate law at T > 350 degreesC, but linear kinetics was obeyed at 300-350 degreesC. It was found that Zr65 was the most oxidation-resistant alloy among the three alloys studied. Scales formed on the alloys during oxidation consisted of mainly tetragonaland monoclinic-ZrO(2) (t- and m-ZrO(2)), and minor CuO and NiO (only detected in Zr53). The amount of m-ZrO(2) formed strongly depends upon the alloy composition, exposure time, and temperature. TEM results showed that a significant amount of nano-grained Zr(2)Cu polycrystals formed beneath the amorphous oxide-scale in Zr53, indicating phase transformation has taken place. By contrast, Zr55 and Zr65 amorphous substrates transformed into Zr(2)Cu and ZrAl after oxidation. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1089 / 1096
页数:8
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