研究生: |
周子鈞 Tzu-Chun Chou |
---|---|
論文名稱: |
不同燒結溫度和不同比例WS2奈米管強化相使用粉末冶金方法製備機械性質強化的WS2/鎂合金奈米複合材料 Effects of sintering temperature and reinforced WS2 nanotubes content on mechanical properties of Mg alloy metal matrix composites fabricated by powder metallurgy |
指導教授: |
黃崧任
Song-Jeng Huang |
口試委員: |
陳元方
Yuan-Fang Chen 羅裕龍 Yu-Lung Lo 徐茂濱 Mau-Pin Hsu |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2018 |
畢業學年度: | 106 |
語文別: | 中文 |
論文頁數: | 128 |
中文關鍵詞: | 鎂基複合材料 、WS2奈米管 、冷均壓成型 、粉末冶金 、高能球磨 、等徑轉角擠製 |
外文關鍵詞: | Magnesium composite, WS2 nanotube, Cold isostatic pressing, Powder metallurgy, Ball milling, Equal channel angular pressing |
相關次數: | 點閱:379 下載:7 |
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本研究嘗試利用粉末冶金方式製造AZ61/WS2奈米管複合材料,並探討WS2奈米管添加比例與燒結溫度等參數對複合材料機械性質之影響。
本研究使用之金屬粉末係以球磨方式製作AZ61粉末,並探討球磨時間對AZ61粉末粒徑大小、粒徑分布與粉末外觀之影響。加入不同比例WS2奈米管得到混合粉末後透過冷均壓方式壓製成生坯,而後以真空燒結爐在不同溫度下進行燒結 (350℃、400℃、450℃)。添加WS2奈米管能有效降低材料內孔隙率,並大幅細化晶粒,有助於硬度提升,另一方面WS2奈米管在基材中可以形成橋接機制 (Bridging Mechanism) 可以有效的分散負載而提高機械性質。對於AZ61/WS2奈米管複合材料而言燒結溫度400℃已足夠使粉末顆粒間達到緻密化,而450℃會使晶粒過度的成長反而降低材料的機械性質,另一方面,添加WS2奈米管在450℃燒結後會產生脆性鎢金屬析出物,降低材料在延展性。經過ECAP之試片透過劇烈塑性變形可以再次細化晶粒與填補孔洞造成機械性質的提升。
Since WS2 nanotubes have been shown to improve material strength and ductility in previous studies, this study attempted to manufacture AZ61/WS2 nanotube composites by powder metallurgy. The effects of the addition percentage of WS2 nanotubes and sintering temperature on the mechanical properties of the composites were investigated.
The AZ61 powder used in this study was made by ball milling, and the effect of ball milling time on the particle size, particle size distribution and powder appearance of AZ61 powder was investigated. The mixed powder was pressed into green bodies by cold isostatic pressing (CIP), and then sintered at different temperatures (350℃, 400℃, and450℃) by vacuum sintering method.
The results showed that the addition of WS2 nanotubes could effectively reduce the porosity of the material and greatly refine the grains, which contributed to the improvement of hardness. On the other hand, WS2 nanotubes was able to effectively disperse the load and improved mechanical properties due to forming bridging mechanism. For this AZ61/WS2 nanotube composite, 400℃ sintering was enough to densify the powder, while 450℃ sintering would cause excessive growth of the grain and reduce the mechanical properties of the material. On the other hand, WS2 nanotubes tended to be decomposed into brittle tungsten metal precipitates after sintering at 450℃. Equal channel angular pressing (ECAP) was able to refine the grain and remove the pores to improve the mechanical properties.
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