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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/13490

Title: 塊狀鋯基非晶質合金之氧化行為
The Oxidation Behavior of Zr-base Bulk Metallic Glasses
Authors: Hsin-Hsin Hsieh
謝心心
Contributors: NTOU:Institute of Materials Engineering
國立台灣海洋大學:材料工程研究所
Keywords: 塊狀非晶質合金;直線型定律;氧化鋯;相變態
BMGs;linear behavior;zirconium oxides;phase transformation
Date: 2002
Issue Date: 2011-06-30T07:22:10Z
Abstract: 本研究主要在討論三式鋯基非晶質合金(Zr-20Cu-12Ni-10Al-5Ti, Zr-30Cu-10Al-5Ni,Zr-15Cu-10Al-10Ni,以下分別簡稱Zr53,Zr55,Zr65)與二式晶質化合金(CZr55,CZr65)在300-5000C空氣中的氧化行為。研究結果顯示三式非晶質合金在氧化溫度為300-3500C時,動力學趨於直線型定律;而當溫度超過3500C時,所有合金皆遵守單一式或兩段式之拋物線型定律,比較動力學結果得知非晶質合金之氧化速率較晶質化合金為快,而Zr65為三式非晶質合金中最佳之抗氧化材料。由X光繞射儀分析氧化層發現各式合金在氧化後皆生成正方晶與單斜晶之ZrO2(以下簡稱t- 和 m-ZrO2),當溫度大於3500C時,亦有少量CuO之生成,而NiO亦在Zr53生成,而m-ZrO2之生成量與氧化時間及合金成份有關。此外TEM觀察Zr53在3000C下氧化73小時的結果可發現氧化層下生成許多奈米晶,顯示氧化的過程中亦伴隨著相變態的發生。觀察非晶質合金於高溫氧化後所產生之結晶相可發現Zr53只生成Zr2Cu,而Zr55與Zr65則生成Zr2Cu與ZrAl兩相。
The aim of this research is to study the oxidation behavior of three bulk amorphous glasses (BMGs), containing Zr-20Cu-12Ni-10Al-5Ti (Zr53), Zr-30Cu-10Al-5Ni (Zr55), and Zr-15Cu-10Al-10Ni (Zr65), and two crystalline counterparts, CZr55 and CZr65 in dry air at 300-500oC. The oxidation kinetics of all the alloys generally followed the single- or two-stage parabolic rate law at T> 350oC, while the three BMGs followed a linear behavior at 300-350oC. The oxidation rate constants for the amorphous alloys are slightly higher than those of crystalline counterparts, and Zr65 alloy is the most resistant alloy among the three BMGs studied. The scales formed on the alloys consist of a mixture of monoclinic- and tetragonal-ZrO2 (m- and t-ZrO2), while CuO was also observed at higher temperatures (T> 350oC). NiO was exclusively detected in the Zr53 alloy. The amount of m-ZrO2 formed on all BMGs is time-dependent and strongly dependent on the alloy composition and oxidation temperature. Based upon TEM results, a plenty of nano-grained polycrystallines formed beneath the amorphous oxide scale for Zr53 at 3000C, indicating that phase transformation was taken place, in which Zr2Cu was exclusively detected, but both Zr2Cu and ZrAl were present in Zr55 and Zr65.
URI: http://ethesys.lib.ntou.edu.tw/cdrfb3/record/#G0000000052
http://ntour.ntou.edu.tw/ir/handle/987654321/13490
Appears in Collections:[材料工程研究所] 博碩士論文

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