本研究主要在比較不同熱軋設備生產的AA 5052鋁合金，經冷軋延及全退火處理
後之性質；其中以Tandem mill生產的稱為熱軋片A，而用Reverse mill生產的稱為熱軋
片C。金相觀察顯示Tandem mill生產之熱軋片A組織較為均勻；而Reverse mill生產的
熱軋片C組織較不均勻，表面晶粒較小，中心晶粒較大。這兩種熱軋片分別經冷軋延
再做退火處理，以探討熱軋組織對完全退火(O-temper)狀態鋁合金各項性能之影響。
所應用的退火熱處理設備，包括藉由鹽浴爐急遽升溫方式來模擬工業界連續退火爐
( CAL, Continuous Annealing Line)，以及傳統緩慢升溫之Batch type空氣爐(heating rate：
30°C/hr) 兩種。發現兩種材料冷軋後，經320°C空氣爐退火，其降伏強度均比經500°C
鹽浴爐退火要高；伸長率則是經500°C鹽浴爐退火的試片較高。由TEM觀察得知經
320°C空氣爐中退火的試片析出物較多，所以強度較高。熱軋片C經冷軋及320°C空氣
爐退火，其降伏強度高於經相同退火處裡的熱軋片A；然而兩種熱軋片經500°C鹽浴
爐退火的降伏強度則差異不大。利用XRD分析熱軋片的織構，發現熱軋片A的織構強
度高於熱軋片C；而兩種熱軋片經冷軋退火後，其織構強度均顯著下降。EBSD分析
發現AA 5052試片在經過兩種退火熱處理(320°C空氣爐和500°C鹽浴爐)後其晶界分布
主要都以高角度晶界為主，且在500°C鹽浴爐得試片其晶粒較接近等軸。

The objective of this work is to investigate the influence of hot rolling process on the
mechanical properties of AA 5052 aluminum alloy. Hot-rolled band fabricated by tandem
mill (hot-band A) will be compared with that fabricated by reverse mill hot-band C).
Optical microscopic observations revealed that hot-band A has a uniform microstructure
throughout the thickness, while hot-band C exhibits non-uniform microstructure, fine
grains near the surface and coarser grains in the center. Both hot-bands were subjected to
cold-rolling and annealing to O-temper. Two annealing processes were used: (a) annealing
in 500oC salt bath, which may simulate the high heating rate of continuous annealing line
(CAL), and (b) annealing in 320oC conventional air furnace with heating rate of 30oC/h,
which may simulate the slow heating rate of batch-type annealing. In general, both
materials annealed in 320oC air furnace exhibit higher yield strength than those annealed in
500oC salt bath do, however, both materials exhibit better tensile ductility after annealed in
500oC salt bath as compared with those annealed in 320oC air furnace.TEM examinations
indicated that the cold-rolled sheet after annealing in 320oC air furnace contains larger
number of precipitates comparing with its 500oC salt bath annealed counterpart. This
observation may account for the higher yield strength of cold-rolled sheet annealed in
320oC air furnace. After cold-rolling and annealing in 320oC air furnace, the material C
shows higher yield strength than the material A does. However, after annealing in 500oC
salt bath, both materials have similar yield strength. XRD pole-figure analysis indicated
that hot-band A exhibited stronger texture than hot-band C did. The texture intensity for
both materials decreased considerably after cold-rolling and annealing. Orientation image
mapping (OIM) obtained by EBSD (electron backscattered diffraction) analysis indicated
that the grain boundaries in both materials after cold-rolling and annealing were mainly
high angle boundaries, and the 500oC salt bath annealed specimens have more equiaxed
grain shape as compared with the 320oC air furnace annealed specimens.

目錄
一、前言 ............................................................................................................................... 1
二、研究目的 ....................................................................................................................... 2
三、文獻回顧 ....................................................................................................................... 3
3-1 AA 5052 鋁合金 ..................................................................................................... 3
3-2 Al-Mg合金中晶粒尺寸對拉伸性質的影響 ......................................................... 3
3-3 Al-Mg合金中影響異向性的因素 ......................................................................... 4
3-4 DC AA5052 鋁合金的晶粒結構和織構分析 ........................................................ 6
3-5 變形織構 ................................................................................................................. 6
3-6 冷軋的微觀組織 ..................................................................................................... 7
3-7 電子背向繞射（electron backscattering diffraction, EBSD）之介紹 .................. 9
3-8 織構對鋁合金可能造成的影響 .......................................................................... 12
四、實驗方法與步驟 ......................................................................................................... 13
4-1 鋁合金之化學成分 ............................................................................................... 13
4-2 實驗探討之項目 ................................................................................................... 13
4-3 硬度量測 ............................................................................................................... 14
4-4 拉伸試驗 ............................................................................................................... 14
4-5 EBSD試片製作 .................................................................................................... 14
五、實驗結果 ..................................................................................................................... 15
5-1 金相微觀組織 ....................................................................................................... 15
5-2 硬度量測 ............................................................................................................... 16
5-3 拉伸性質 ............................................................................................................... 16
5-4 X-ray量測之ODF(orientation distribution function) .......................................... 18
5-5 EBSD分析 ............................................................................................................ 19
六、討論 ............................................................................................................................. 22
6-1 金相微觀組織差異 ............................................................................................... 22
6-2 觀察試片在退火熱處理後可能產生的析出物 ................................................... 22
6-3 EBSD量測晶界分布與晶粒形狀對機械性質的影響 ........................................ 23
6-4 織構強度 ............................................................................................................... 23
七、結論 ............................................................................................................................. 25
八、參考文獻 ..................................................................................................................... 27

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