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研究生:曾銀春
研究生(外文):Yin-Chun Tseng
論文名稱:錳鋁二元系機械合金及其磁性之研究
論文名稱(外文):Amorphization and Magnetic Properties of Mechanical Alloyed Manganese-Aluminum Binary Alloy System
指導教授:洪銘盤;張炎輝
指導教授(外文):Ming-Pan Hung;Yen-Hwei Chang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:材料科學(工程)研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:1994
畢業學年度:82
語文別:中文
論文頁數:102
中文關鍵詞:機械合金非晶質混合熱鐵磁性飽和磁化量保磁力
外文關鍵詞:Mechanical AlloyAmorphousEnthalpy of Mixing Ferromagnetism
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本研究係利用高能量離心式磨機,將純錳與純鋁混合粉末,在氬氣氣氛保
護下,製得機械合金Mn-Al二元合金粉末。機械合金Mn sub x Al sub
1-x 粉末的非晶質化過程中,在非晶質化尚未完成之前會先出現Mn sub
5 Al sub 8相,且可在0.4 .ltoreq. X .ltoreq. 0.9 的成分範圍內製得
非晶質 Mn sub x Al sub 1-x 粉末,並計算各成分之非晶質粉末的混合
熱,以瞭解混合熱對各成分非晶質化反應速率的影響。先將純元素的
錳(70.5 wt%)及鋁(29.5 wt%)粉末充分混合後(以配成Mn sub 0.55 Al
sub 0.45 成分粉末),再將此粉末以機械合金化(Mechanical alloying)
方法來研磨10-150小時。其中以研磨50小時後效果最佳,在此研磨條件下
添加碳元素粉末,其添加量為0.2-2.0 wt%。將研磨過後粉末壓製成形後,
於不同熱處理溫度(450-650 degree C)及熱處理時間(0.5-5小時)下進行
處理,以獲得鐵磁性.tau.相。其添加0.6 wt%碳元素並研磨50小時的機械
合金Mn sub 0.55 Al sub 0.45 粉末,在600 deg- ree 熱處理2.5小時時
可得到最大飽和磁化量值,78 emu per gram,而保磁力則隨碳含量增加
而增加至約1400-2000 Oe。

Elemential managanese and aluminum powders were mechan- ical
alloyed by high ball milling of centrifugal tpye argon
atomosphere. Amorphous Mn sub x Al sub 1-x powders were pre-
pared in the concentration range of 0.4 .ltoreq. X .ltoreq. 0.9
and the Mn sub 5 Al sub 8 phase appeared behore amorphiz-
ation. the enthalpies of mixing was calculated for these amor-
phous powders and the effect of enthalpies on the reaction rate
of amorphization was also discussed. Manganses concentration
was 70-72 wt% in the Mn-Al binary alloy system. the .tau. phase
was the only ferromagnetic phase. Elemental manganese (70.5
wt%) and aluminum (29.5 wt%) powder would be enough mixed (for
composing powder of Mn sub 0.55 Al sub 0.45), then these mixed
powders were milled used by mechan- ical alloying method for
10-150 hour and the milling time of 50 hour was found best.
Accoding to this optimal condition, we add- ed elemential
carbon (0.2-2.0 wt%) powders to the Mn sub 0.55 Al sub 0.45
powders. After 50 hour milling, the mechanically alloy- ed
powders was compact into a disk of 6 mm diameter and 1 mm
thickness under a pressure of 780 MPa. The disks were sealed in
quartz tubes under vaccum (10E-2 Torr) and annealed at 450-650
degree C for 0.5-5 hour, then quenched in water order to obtain
the .tau. phase. When the different carbon content of 50 hour
milled Mn sub 0.55 Al sub 0.45 powder annealed at 450-650
degree C for 0.5-5 h, A maximum value of the saturation
magnetization 78 emu per gram was obtained, for adding 0.6 wt%
of carbon and anneaded at 600 degree C for 2.5 hour. The
coercivity increased with increasing carbon concentration
(0.2-2.0 wt%) and its value was 1400-2000 Oe.

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