查詢結果分析
來源資料
頁籤選單縮合
| 題 名 | 鎂合金固相回收之研究=Recycling the Magnesium Alloy AZ91D in Solid State |
|---|---|
| 作 者 | 翁仁斌; 方友清; | 書刊名 | 新新科技年刊 |
| 卷 期 | 3 2007.01[民96.01] |
| 頁 次 | 頁249-257 |
| 分類號 | 472.7 |
| 關鍵詞 | 複合材料; 擠製; 回收; 析出; 微結構; AZ91鎂合金; Composite materials; Extruction; Reclamation; Aging; Microstructure; AZ91 magnesium alloy; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 鎂合金具輕量化效果,使用量日益增加。相對地,廢料或料頭也大幅增多。目前以送回原料廠重熔之回收方式為主。本研究則以固相方式,將廢料加壓固化後高溫擠製,直接製作成品或半成品。 本研究採用鎂合金AZ91D之切屑料,以100噸壓機固化預成形後,再加熱至350°C擠製成ψ20mm棒材。擠製後棒材施以熱處理探討其析出硬化特性。研究結果顯示未經氧化之切屑料擠製棒材的抗拉強度為289.5MPa,降伏強度為79.7MPa,伸長量6.9%,晶粒大小約為7.5μm(max: 15μm,min: 3μm)。而擠製後以415°C×4hrs均質化處理後,抗拉強度達310MPa,且伸長量可達19.7%,在析出硬化研究中,可知經170°C及250°C不同時間條件之時效處理後,抗拉強度分別提高至330MPa及317.5MPa。由顯微組織分析,發現時效處理將促使共晶組織形成,且共晶組織有隨時效時間增加而增多的趨勢。 |
| 英文摘要 | Mg alloy with the specific weight of 1.74 g/cm is the lightest structural metal and possesses a number of advantages such as specific strength、specific stiffness and material recycling. Therefore Mg alloy has been used prevalently at 3C' automobile and bicycle industries. The applications of Mg alloy having been highly developed recently, a large amount of waste materials have been produced due to the low yield rate of manufacturing processes, it is revealing the problem of recycling. The liquid-phase recycling process has been commonly used in the industry. This paper proposed a solid-state method for Mg alloy recycling. In this new method, the chips of waste material was first pressed into an ingot, the ingot was then plastically deformed at a high temperature to make the final or semi-finished products. The experimental results showed that the ultimate tensile strength, yield strength, and elongation of the as extruded bar with an average grain size of 7.5 μm were 289.5 MPa, 79.7 MPa, and 6.9%, respectively. After age hardening treatment the maximum ultimate tensile strengths increase to 330MPa and 31.5 MPa for aging at 170(C and 215(C, respectively. From microstructural analysis, it was found that the aging treatment would advance the formation of cutectic-like lamellar structure, and the lamella structure increased with aging time. |
本系統中英文摘要資訊取自各篇刊載內容。