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Student Number 943209004
Author Ming-hong Jhou(周明弘)
Author's Email Address No Public.
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Department Graduate Institute of Materials Science and Engineering
Year 2006
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Study of intermetallic growth in Mg-Ni diffusion couples
Date of Defense 2007-06-27
Page Count 53
Keyword
  • diffusion couples
  • hydrogen storage materials
  • Mg2Ni
  • Abstract Two sets of experiments were carried out in this work. The first was the reaction between solid Mg and solid Ni, and the second was the investigation of dominant diffusion species in the formation of Mg2Ni. The data of kinetics for Mg-Ni interfacial reaction would be established.
    In this work, the Mg and Ni sheets were combined and then taken to perform solid/solid reaction at 400℃, 430℃, 450℃ and 480℃ for 10~75 hours, respectively. The morphology of the heat-treated specimens was observed by scanning electron microscope(SEM). The chemical composition was measured by electron probe microanalysis(EPMA). The diffusion couple specimen was taken apart to analysis which kind of intermetallic compound was formed at the interface of Mg/Ni by X-ray diffractometer(XRD). The result showed that just single Mg2Ni phase was formed at the interface of Mg/Ni and the thickness of Mg2Ni is linear to the square root of reaction time. Thus, it is believed that the reaction of the formation of Mg2Ni at the Mg/Ni interface is diffusion controlled.
    In addition, it was also investigated that which element in Mg/Ni diffusion couple diffused faster at reaction temperature between 400 and 480℃. The result presented that Mg possesses higher diffusivity than Ni in accordance with SEM pictures. However, this result is different from that of other researchers made by simulation of Rutherford backscattering spectrometer(RBS) research of Mg/Ni coating membrane at relatively low temperature(225℃). We consider that the dominant diffusion species in the formation of Mg2Ni could change at different reaction temperature. But this assumption need more experimental result to support.
    Table of Content 中文摘要…………………………………………………………………Ⅰ
    英文摘要…………………………………………………………………Ⅱ
    目錄………………………………………………………………………Ⅴ
    圖目錄……………………………………………………………………Ⅶ
    表目錄……………………………………………………………………Ⅸ
    第一章緒論
        1.1研究背景…………………………………………………….1
         1.1.1氫能源與儲氫材料……………………………………1
    1.1.2儲氫合金……………………………………………………......4
    1.1.3鎂基儲氫合金………………………………………………......6
        1.2研究目的…………………………………………………….9
    第二章文獻回顧與實驗規劃
    2.1鎂鎳二元平衡相圖………………………………………………...10
    2.2鎂鎳界面反應……………………………………………………...11
    2.3擴散反應…………………………………………………………...15
    2.3.1擴散機制…………………………………………………….....16
    2.3.2交互擴散及界面反應……………………………………….....18
    2.3.3 Kirkendall效應……………………………………………....21
    2.4實驗規劃…………………………………………………………...23
    第三章實驗方法及步驟
    3.1固態鎂與固態鎳在400-480℃的界面反應………………………..24
    3.2溫度400-480℃時介金屬中主要擴散元素………………………..29
    第四章實驗結果
        4.1固態鎂與固態鎳之界面反應………………………………31
        4.1.1 掃描式電子顯微鏡觀察……………………………….31
    4.1.2 EPMA組成分析結果………………………………………......38
    4.1.3 XRD實驗結果…………………………………………….......40
    4.1.4鎂鎳的反應動力學………………………………………….....41
    4.2主要擴散元素……………………………………………………...45
    第五章結果討論
    5.1未觀察到MgNi2的原因…………………………………………....47
    5.2主要擴散元素……………………………………………………...48
    第六章總結…………………………………………………………50
    參考文獻…………………………………………………………………52
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    Advisor
  • Shao-Liang Cheng(鄭紹良)
  • C. Robert Kao(高振宏)
  • Files
  • 943209004.pdf
  • approve immediately
    Date of Submission 2007-07-09

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