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Student Number 88323042
Author Guang-Cheng Kuo(郭光程)
Author's Email Address No Public.
Statistics This thesis had been viewed 2511 times. Download 11 times.
Department Mechanical Engineering
Year 2000
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title The mechanical properties of tensile and compression for 7005 aluminium alloy and AZ61A magnesium alloy
Date of Defense 2001-07-18
Page Count 141
Keyword
  • 7005
  • AZ61A
  • dynamic recovery
  • stacking fault energy
  • Abstract This study investigated mainly about the effect of environmental temperature and strain rate on tensile, compression test and different morphology of fracture surface for two different materials: HCP structure — magnesium alloy, AZ61A and FCC structure — Aluminum alloy, 7005. Both materials were took tensile test at higher strain rate and lower strain rate and show the same trend that UTS, yield stress were decreased with increasing environmental temperature form room temperature to 300℃; elongation show oppositely trend of both materials. In this study, 7005 showed dynamic recovery while tensile tested under lower strain rate and higher environmental temperature due to its high stacking fault energy and under the same test parameters for AZ61A, magnesium alloy showed dynamic recrystallization and soften while tested at high environmental temperature due to intrinsic stacking fault during plastic deformation. For compression test of AZ61A, compression strength and yield stress decreased with increasing environmental temperature under lower compression strain rate; it showed oppositely trend under higher compression rate. For compression test of 7005, compression strength and yield stress decreased with increasing environmental temperature while over 100℃ under lower compression strain rate; compression strength and yield stress decreased with increasing environmental temperature under higher compression strain rate.
    For observation of morphology of fracture surface, both AZ61A and 7005 showed ductile rupture and the size of dimples on the fracture surface were enlarged with increasing environmental temperature. For compression test, both materials showed cleavage rupture regardless the strain rate and environmental temperature.
    Table of Content 總目錄…………………………………………………………………………i
    表目錄…………………………………………………………………………iv
    圖目錄…………………………………………………………………………v
    第一章 前言……………………………………………………………………1
    第二章 文獻回顧……………………………………………………………2
    2-1材料簡介……………………………………………………………………2
    2-1.1鎂合金材料介紹…………………………………………………………2
    2-1.2合金元素對鎂合金的影響………………………………………………3
    2-1.3鋁合金材料介紹…………………………………………………………6
    2-1.4合金元素對鋁合金的影響………………………………………………6
    2-2拉伸、壓縮試驗…………………………………………………………10
    2-2.1破裂(fracture)……………………………………………………10
    2-2.2萬能試驗機………...…………………………………………………10
    2-2.3拉伸、壓縮試驗介紹…………………………………………………10
    2-2.4真實應力-真實應變曲線……………………………………………11
    2-3破斷面的觀察……………………………………………………………12
    第三章 理論探討……………………………………………………………14
    3-1晶格結構分析……………………………………………………………14
    3-1.1鋁的面心立方晶格結構簡介…………………………………………14
    3-1.2鎂的六方緊密堆積晶格結構簡介……………………………………14
    3-1.3面心立方與六方緊密堆積結構的比較………………………………15
    3-2雙晶結構的介紹…………………………………………………………17
    3-3動態回復(Dynamic Recovery)………………………………………18
    3-4動態在結晶(Dynamic Recrystallization)………………………19
    3-5相關文獻介紹……………………………………………………………20
    第四章 實驗方法與步驟……………………………………………………23
    4-1實驗材料…………………………………………………………………23
    4-2試棒準備與規格…………………………………………………………23
    4-2.1鎂合金(AZ61A)………………………………………………………23
    4-2.2鋁合金(7005)………………………………………………………24
    4-3實驗設備…………………………………………………………………24
    4-3.1萬能拉伸試驗機………………………………………………………24
    4-3.2掃描式電子顯微鏡……………………………………………………24
    4-3.3實體顯微鏡……………………………………………………………24
    4-4實驗步驟…………………………………………………………………25
    4-5金相製作與觀察…………………………………………………………25
    4-5.1試片製作………………………………………………………………25
    4-5.2腐蝕液配方……………………………………………………………26
    4-6實驗參數設定……………………………………………………………26
    4-6.1實驗材料………………………………………………………………26
    4-6.2拉伸實驗………………………………………………………………27
    4-6.3壓縮實驗………………………………………………………………27
    第五章 結果與討論…………………………………………………………28
    5-1拉伸實驗之機械性質分析………………………………………………29
    5-1.1鎂合金(AZ61A)拉伸機械性質分析……………………………….29
    5-1.2鋁合金(7005)拉伸機械性質分析…………………………………33
    5-2壓縮實驗之機械性質分析………………………………………………35
    5-2.1鎂合金(AZ61A)壓縮機械性質分析………………………………35
    5-2.2鋁合金(7005)壓縮機械性質分析…………………………………37
    5-3鎂合金(AZ61A)與鋁合金(7005)
    之拉伸、壓縮破裂形式分析…………………………………………38
    5-3.1鎂合金(AZ61A)與鋁合金(7005)
    之拉伸破裂形式分析…………………………………………………38
    5-3.2鎂合金(AZ61A)與鋁合金(7005)
    之壓縮破裂形式分析……………………………………………………41
    5-3.3鎂合金(AZ61A)與鋁合金(7005)
    之拉伸、壓縮差異…………………………………………………………42
    第六章 結論…………………………………………………………………43
    參考文獻……………………………………………………………………45
    附錄…………………………………………………………………………142
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    Advisor
  • Teng-Shih Shih(施登士)
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    Date of Submission 2001-07-18

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