研究生: |
林穎志 YING-CHIH LIN |
---|---|
論文名稱: |
鎂基複合材料機械性質及其熱傳導性之研究 Study of mechanical properties and thermal conductivity of Magnesium matrix composites |
指導教授: |
黃崧任
Song-Jeng Huang |
口試委員: |
羅裕龍
Yu-Lung Lo 丘群 Chun Chiu 林柏州 Po-Chou Lin |
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: | 120 |
中文關鍵詞: | 鎂基複合材料 、T6熱處理 、機械性質 、熱傳導係數 、鹽霧試驗 |
外文關鍵詞: | magnesium matrix composites, T6 heat- treatment, mechanical properties, thermal conductivity, salt spray test |
相關次數: | 點閱:273 下載:4 |
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本研究選用AZ91D、AM60B、AM50A等鎂合金作為基體材料,而選用的強化相顆粒為氮化鋁 (AlN)、氧化鋁 (Al2O3) 微米顆粒,分別以1、5wt. %之添加量,藉由重力鑄造方式進行攪拌混合,之後再將製備好的鑄錠,切割成試片,來測試鎂基複合材料之機械性質、微觀結構、熱傳導性質以及其耐腐蝕性。
在拉伸試驗方面,添加強化相顆粒後,材料的降伏強度、極限抗拉強度比起原材均有增加的趨勢;硬度方面,由於材料添加高硬度陶瓷顆粒以及經過T6熱處理,析出Mg17Al12相,而有增加的趨勢;熱傳導係數方面,添加AlN熱傳導係數提升較多,故AlN有助於改善材料熱傳導性;鹽霧試驗方面,由於鎂合金含有錳元素較能抵抗鹽霧的腐蝕,故鎂基複合材料腐蝕速率與母材相較之下,差異不大,故添加AlN 、Al2O3顆粒對鎂合金的腐蝕性影響較小。
In this study, magnesium alloys such as AZ91D, AM60B and AM50A were selected as the matrix materials, and the reinforcement particles selected were aluminium nitride (AlN) and aluminium oxide (Al2O3) microparticles. In addition, the amount of 1, 5 wt.% reinforcement particles were added respectively into matrix by gravity casting. After casting the prepared ingot were used to test the mechanical properties, microstructure, thermal conductivity and corrosion resistance of the magnesium matrix composites.
In the tensile test, after added reinforcement particles the material's Yield strength and ultimate tensile strength tend to increase compared with the pure magnesium alloys. In terms of hardness, due to the addition of high-hardness ceramic particles to the material and the heat treatment by T6, the Mg17Al12 phase is precipitated, which has an increasing tendency. In terms of thermal conductivity, addition of AlN heat transfer coefficient is enhanced. So AlN particles help to improve the thermal conductivity of the material. In the salt spray test, since the magnesium alloy contains manganese, it is more resistant to salt spray corrosion. Therefore, the corrosion rate of the magnesium matrix composites was not much different from that of AZ91D, AM60B and AM50A matrix. So the corrosion of the magnesium alloy is not changed by the addition of AlN and Al2O3 particles.
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