應用鑄鍛生產高、中強度與高延性鋁合金

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張哲維(Che-wei Chang) 查詢紙本館藏

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機械工程學系

論文名稱

應用鑄鍛生產高、中強度與高延性鋁合金

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摘要(中)

本實驗主要合金成份以Al-8Zn-2Mg-1.5Cu-xZr合金(x為0.15、0.49)、Al-1.0Mg-0.6Si-0.2Cu合金及Al-1.2Mg-1.0Si-1.0Cu-0.15Zr合金做為實驗材料，澆鑄船型模、Y-block金屬模尺寸為100×40×100 mm。船型模鑄件均質化、退火後固溶再T6處理；Y-block鑄件施以同樣均質化與退火後兩道次熱鍛60%變形量，最後固溶和T6處理。將時效後的兩種材料加工成拉伸試棒並測試拉伸性質，比較不同試棒的拉伸性質和微結構。
在鑄/鍛熱鍛變形量約60%後固溶及T6處理，可獲得高強度Al-8Zn-2Mg-1.5Cu-0.49Zr合金抗拉強度為583MPa和延伸率為8.4%；Al-1.2Mg-1.0Si-1.0Cu-0.15Zr合金，可得中高強度抗拉強度為420MPa和延伸率為10%；Al-1.0Mg-0.6Si-0.2Cu合金，可得良好延伸率為16%及適當抗拉強度為310MPa。

摘要(英)

Three groups of alloys of Al-8Zn-2Mg-1.5Cu-xZr(x=0.15、0.49)、Al-1.0Mg-0.6Si-0.2Cu and Al-1.2Mg-1.0Si-0.15Zr were prepared and melted in this study to get boat molds and Y-block permanent mold castings in size of 100×40×100mm. After homogenization and annealing, the boat mold casting were removed for solution treatment and T6 treatment; the Y-block castings would subject to two passes of hot forged with 60% deformation then removed for solution treatment and T6 treatment. After aging all samples were machined to the standard tensile test specimens to get tensile strengths of different samples. Microstructures and tensile properties of different samples were compared and discussed.
After the cast/forge hybrid process with 60% reduction by hot deformation, solution and aging treatment, the Al-8Zn-2Mg-1.5Cu-0.49Zr alloy samples obtained high strength of (UTS) 583MPa and 8.4% in elongation; the Al-1.2Mg-1.0Si-1.0Cu-0.15Zr alloy samples acquired moderate strength of (UTS) 420MPa and 10% in elongation; the Al-1.0Mg-0.6Si-0.2Cu alloy samples got excellent elongation of 16% with proper strength (UTS) of 310MPa.

關鍵字(中)

★ 鑄/鍛
★ 拉伸性質
★ 微結構

關鍵字(英)

★ Cast/forge hybrid process
★ Tensile property
★ Microstructures

論文目次

摘要 i
目錄 iii
圖目錄 v
表目錄 vii
第一章前言 1
第二章文獻回顧 2
2-1 常用鑄造鋁合金 2
2-1-1 A356(鋁-矽-鎂)合金特點 2
2-1-2 A380鋁合金之特點(含矽、鐵高之鋁合金) 3
2-2高強度鑄造鋁合金 Al-Zn-Mg-Cu-(Zr) 3
2-2-1 Al-xZn-yMg-(Cu)合金 4
2-2-2 Al-(7-9%)Zn-(2-2.5%)Mg-xCu合金 8
2-2-3 Al-(7-9%)Zn-(2-2.5%)Mg-(1.5-2%)Cu-xZr系鑄造鋁合金 8
2-2-4 Al-xMg-ySi-(Cu)系鑄造鋁合金 10
2-2-5 鑄鍛不同等級鋁合金的挑戰 11
2-3 提升鑄造鋁合金鑄件品質的注意事項和方法 13
2-3-1 冒口(riser) 13
2-3-2 均質化處理(homogenization treatment) 13
2-3-3固溶處理(solution treatment) 14
2-3-4時效處理(aging treatment) 15
2-3-5塑性變形對鋁合金性質的影響 16
2-3-6氧化膜 18
2-3-7介在物顆粒 19
2-3-8 其他注意事項 20
第三章實驗步驟與方法 21
3-1 實驗材料 21
3-2實驗設備 21
3-3試棒尺寸與模具 22
3-4 實驗步驟 24
第四章結果與討論 29
4-1小爐次實驗結果與討論 29
4-1-1 成份與熱處理實驗 29
4-1-2 熱處理參數最佳化與變形的影響 30
4-1-3 微結構 32
4-2 大爐次實驗結果與討論 34
4-2-1 除氣/除渣實驗 34
4-3 高強度Al-8Zn-2Mg-1.5Cu-(xZr)鑄/鍛鋁合金的機械性質與微結構 36
4-3-1高強度Al-8Zn-2Mg-1.5Cu鑄/鍛鋁合金 38
4-3-2高強度Al-8Zn-2Mg-1.5Cu-0.15Zr鑄/鍛鋁合金 42
4-3-3高強度Al-8Zn-2Mg-1.5Cu-0.49Zr鑄/鍛鋁合金 46
4-3-4 高強度鑄/鍛鋁合金的理想參數 52
4-4 高延性Al-1.0Mg-0.6Si-0.2Cu鑄/鍛鋁合金機械性質與微結構 53
4-5 中高強度Al-1.2Mg-1.0Si-1.0Cu-0.15Zr鑄/鍛鋁合金機械性質與微結構 58
第五章結論 64
參考文獻 65
附錄 73

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指導教授

施登士(Teng-shih Shih)

審核日期

2015-7-28

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