研究生: |
陳易寬 Yi-Kuan Chen |
---|---|
論文名稱: |
鎂基複合材料Mg-Ca / MgO經等通道轉角擠製對機械性質與耐蝕性之研究 Effect of Equal Channel Angular Pressing on the mechanical properties and corrosion resistance of Mg-Ca / MgO magnesium matrix composites |
指導教授: |
黃崧任
Song-Jeng Huang |
口試委員: |
丘群
Chiu Chun 李天錫 Tien-Hsi Lee 曾有志 Yu-Chin Tzeng |
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: | 2023 |
畢業學年度: | 111 |
語文別: | 中文 |
論文頁數: | 121 |
中文關鍵詞: | 鎂基複合材料 、等通道轉角擠製 、機械性質 、耐蝕性質 |
外文關鍵詞: | magnesium matrix composites, equal-channel angular pressing, mechanical properties, corrosion resistance |
相關次數: | 點閱:330 下載:0 |
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鎂合金作為可生物降解之植入物被廣泛研究,但由於鎂合金在人體內的腐蝕速率過快,造成許多不利影響。本實驗利用等徑轉角擠製ECAP及強化相之添加,加以改善可生物降解之鎂合金。以鎂鈣合金(Mg-1Ca)作為實驗基材,用奈米級之MgO顆粒作為添加的強化相,添加量分別為0、1、2 wt. %,使用重力鑄造法製備鎂基複合材料。隨後鑄錠切割成ECAP試棒,再進行450 °C之T4固溶處理,持溫24小時,再以等徑轉角擠製加工(ECAP)之Bc路徑進行擠製,加工道次是分別為1、4道次,研究不同比例之Mg-1Ca / MgO鎂基複合材料及不同道次之微觀結構、機械性質及耐腐蝕性的影響。
實驗結果中發現,添加MgO後因散布強化有效增加極限抗拉強度及降伏強度,但會因強化項為脆性且部分團聚的關係使材料伸長率下降,而鎂基複合材料藉由後續的ECAP擠製加工使晶粒產生動態再結晶而晶粒細化,其機械性質進一步提升,且經過4道次ECAP後,含有強化項的鎂基複合材料延展性比無添加強化項的更加優異。在電化學實驗中,添加過多的MgO會使耐蝕力下降,但透過ECAP加工後能藉由晶粒細化使保護膜更能抵抗腐蝕,提升耐蝕能力。
Magnesium alloys are widely studied as biodegradable implants, but due to the rapid corrosion rate of magnesium alloys in human body, many adverse effects are caused. In this experiment, the magnesium alloys were improved by using equal channel angular pressing and the reinforcement.
Mg-1Ca was used as the experimental substrate, and nano MgO particles were used as the reinforcement with the addition amounts of 0, 1, and 2 wt. %, respectively. After solution treatment, the cast ingots were extruded by equal channel angular pressing process, and the number of passes was 1 and 4 respectively.
The experimental results show that the addition of MgO to the material effectively increases the ultimate tensile strength and yield strength due to the dispersal strengthening, but the elongation decreases due to the agglomeration of the reinforcement. The mechanical properties of the magnesium-based composite material were further improved by the ECAP process, which resulted in dynamic recrystallization and grain refinement.
In electrochemical experiments, the addition of too much MgO will reduce the corrosion resistance, but the ECAP process can make the protective film more resistant to corrosion by grain refinement and improve the corrosion resistance.
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