微量Zr與冷加工對Al-4.7Zn-1.6Mg合金淬火敏感性之影響

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黎諺燊(Yan-Shen Li) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

微量Zr與冷加工對Al-4.7Zn-1.6Mg合金淬火敏感性之影響
(Effect of Minor Zr and Cold Working on Quenching Sensitivity of Al-4.7Zn-1.6Mg Alloys)

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摘要(中)

藉由微結構觀察、DSC(Differential Scanning Calorimetry)量測與
端面淬火測試(Jominy End Quench Test)等，探討微量Zr 與冷加工對
Al4.7Zn1.6Mg 合金淬火敏感性之影響。結果顯示，Zr 元素可有效
抑制淬火敏感性的上升；冷加工則使Al4.6Zn1.6Mg(0.1Zr)合金
淬火敏感性上升。Al4.6Zn1.6Mg0.1Zr 合金經過冷加工後，因再
結晶驅動力較大，新晶粒中的Al3Zr 相失去整合性成為一異質成核
點，故淬火敏感性較熱加工之Al4.7Zn1.6Mg0.1Zr 合金大。長時
間的固溶處理對熱加工之Al4.7Zn1.6Mg 合金無較大影響，然而可
使冷加工之Al4.7Zn1.6Mg 合金的晶粒成長，減少晶界，使其淬火
敏感性稍微下降；長時間固溶處理使Al4.7Zn1.6Mg0.1Zr 合金之
再結晶比例增加，穩定態相異質析出量上升，然熱加工之
Al4.7Zn1.6Mg0.1Zr 合金的穩定態相異質析出量對端面淬火試
驗空冷端之硬度值影響較不明顯，冷加工之Al4.7Zn1.6Mg0.1Zr
合金的穩定態相異質析出量對端面淬火試驗空冷端之硬度值影響較
大。

摘要(英)

We investigate the effect of minor Zr and cold working on
quenching sensitivity of Al4.7Zn1.6Mg alloy by microstructure
observing, DSC measurement and Jominy End Quench Test, and so on.
The result shows that Zr element can inhibit quenching sensitivity
significantly, while cold working make quenching sensitivity of
Al4.6Zn1.6Mg(0.1Zr) obviously. Recrystallization motivation of cold
worked Al4.6Zn1.6Mg0.1Zr alloy is larger than hot extruded one and
there are many low coherency Al3Zr particles as heterogeneous
nucleation sites in the new grains, so the quenching sensitivity of cold
worked alloy is more than hot worked one. Longterm solution treatment
has no certain impact on hot worked Al4.6Zn1.6Mg alloy, but make
average grain size of cold worked Al4.6Zn1.6Mg alloy growth, reduce
the grain boundary area and lower quenching sensitivity of cold worked
Al4.6Zn1.6Mg alloy slightly. Longterm solution treatment enhance
recrystallization fraction of Al4.6Zn1.6Mg0.1Zr alloy, and increase
the amount of precipitation of stable  phase. The amount of precipitation
of stable  phase influence hardness ineffectively in the air cooling end of
Jominy End Quench test tube of hot worked Al4.6Zn1.6Mg0.1Zr
alloy, but effectively for cold worked Al4.6Zn1.6Mg0.1Zr alloy.

關鍵字(中)

★ Al-4.7Zn-1.6Mg合金
★ 冷加工
★ 固溶處理
★ 淬火敏感性

關鍵字(英)

★ Al-4.7Zn-1.6Mg alloy
★ cold working
★ solution treatment
★ quenching sensitivity

論文目次

中文摘要.....................................................................................................i
英文摘要....................................................................................................ii
謝誌...................................................................................................iii
總目錄...................................................................................................iv
表目錄...................................................................................................vi
圖目錄..................................................................................................vii
一、前言與文獻回顧..............................................................................1
1.1 7000 系鋁合金簡介...............................................................1
1.2 析出硬化機制........................................................................6
1.3 淬火敏感性............................................................................8
1.4 均質成核與異質成核............................................................9
1.5 合金元素添加對於7000 系鋁合金之影響........................13
1.5.1 鋯對7000 系鋁合金再結晶之影響..........................13
1.5.2 鋯對7000 系鋁合金機械性質之影響......................15
1.5.3 鋯對7000 系鋁合金淬火敏感性之影響..................16
1.5.4 銅對7000 系鋁合金淬火敏感性之影響..................18
1.5.5 鉻對7000 系鋁合金淬火敏感性之影響..................19
1.6 熱處理對淬火敏感性之影響..............................................19

1.7 實驗目的與規劃..................................................................20
二、實驗方法........................................................................................21
2.1 合金熔配、熱處理與熱/冷加工.......................................21
2.2 微結構觀察.........................................................................24
2.2.1 光學顯微鏡(OM)......................................................24
2.2.2 導電度量測..............................................................25
2.2.3 穿透式電子顯微鏡(TEM).......................................25
2.2.4 示差掃描熱量計(DSC)...........................................25
2.3 機械性質測試.....................................................................25
2.3.1 拉伸試驗..................................................................26
三、結果與討論....................................................................................27
3.1 微結構分析.........................................................................27
3.1.1 晶粒結構與析出相觀察..........................................27
3.1.2 導電度量測..............................................................39
3.1.3 DSC 量測...............................................................42
3.2 機械性質測試.....................................................................47
3.2.1 端面淬火試驗........................................................47
四、結論................................................................................................50
五、參考文獻........................................................................................51

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