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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/30860

Title: 鎂鋁混合粉末之機械合金化行為研究
Mechanical Alloying of Mg-Al System
Authors: 林宗賢
Contributors: NTOU:Institute of Materials Engineering
國立臺灣海洋大學:材料工程研究所
Keywords: 鎂鋁粉末;機械合金
Date: 2011
Issue Date: 2012-04-13T07:40:19Z
Abstract: 本研究是探討組成MgxAl100-x粉末 (x=40、50、58.6、60、70)之鎂鋁純元素混合粉末的機械合金化行為,對所合成的粉末進行XRD、DSC、SEM等分析檢測結果。 Mg40Al60、Mg50Al50粉末於球磨處理六小時後的生成相為Al(Mg)過飽和固溶體相及非晶質相,無法形成相圖所示的β-Mg2Al3與γ-Mg17Al12平衡相;Mg58.6Al41.4與Mg60Al40粉末在球磨二至三小時後隱約有γ-Mg17Al12的繞射峰產生,球磨至六小時則可以形成γ-Mg17Al12平衡相;Mg70Al30之六小時球磨粉末的生成相符合相圖所預測之γ-Mg17Al12及Mg相。 MgxAl100-x粉末經過球磨處理後,難以形成β-Mg2Al3相,主要是因為β- Mg2Al3相的結構複雜且單位晶胞尺寸巨大所導致的。但經由熱處理過後Mg40Al60合金粉末可以形成γ-Mg17Al12及β-Mg2Al3相,且在350 ℃持溫30分鐘可以完全形成β-Mg2Al3相。Mg50Al50球磨粉末經由200℃熱處理過後幾乎以γ-Mg17Al12相為主,但在300 ℃熱處理後便有β-Mg2Al3介金屬化合物相。而組成Mg58.6Al41.4、Mg60Al40和Mg70Al30經由熱處理過後其γ-Mg17Al12相的結晶性更好。 透過Williamson-Hall formula公式可了解在球磨過程中磨球之間的撞擊所給予粉末的能量,使得Mg、Al在球磨時應變量逐漸上升,此導致Mg58.6Al41.4、Mg60Al40在球磨三小時開始生成γ-Mg17Al12。
This study is to explore the mechanical alloying behavior that the composition of MgxAl100-x powders (x = 40,50,58.6,60,70) is mixed powders of Mg-Al pure elements, and then the synthesized powder will analysis and detection after the XRD, DSC, SEM, etc. Mg40Al60 and Mg50Al50 powders after six hours milling process are in the generation phase of Al (Mg) supersaturated solid solution phase and amorphous phase, not formed β-Mg2Al3 and γ-Mg17Al12 equilibrium phase as shown in the phase diagram; Mg58.6Al41 .4 and Mg60Al40 powders in the milling after two to three hours are looming γ-Mg17Al12 diffraction peak, and keep milling to six hours can be formed γ-Mg17Al12 equilibrium phase; the generation phase of six hours milled Mg70Al30 powder t is full compliance with the phase diagram and it’s in the majority of γ-Mg17Al12 and Mg phase. MgxAl100-x powders after milling is difficult to form β-Mg2Al3 equilibrium phase, its cause of the β-Mg2Al3 phase is with the complex structure and the huge unit cell dimensions. But Mg40Al60 alloy powder after heat treatment can form γ-Mg17Al12 and β-Mg2Al3 phase, and fully formed β-Mg2Al3 phase when the temperature holds at 350 ℃ 30-minute. Mg50Al50 milled powder a is almost γ-Mg17Al12 phase after 200 ℃ heat treatment, but, the β-Mg2Al3 intermetallic compound phase is occurred after heat treatment at 300 ℃. Which consists of Mg58.6Al41.4, Mg60Al40 and Mg70Al30 have better γ-Mg17Al12 crystalline phase after the heat treatment The impact between the balls of energy given with powder can be understood by Williamson-Hall formula formula in the milling process, and making the strain of Mg, Al increase gradually in the milling, this result is lead Mg58.6Al41.4, Mg60Al40 to start generating γ-Mg17Al12 from three hours in the milling.
URI: http://ethesys.lib.ntou.edu.tw/cdrfb3/record/#G0M98550011
http://ntour.ntou.edu.tw/handle/987654321/30860
Appears in Collections:[材料工程研究所] 博碩士論文

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