研究生: |
蔡承勳 Tsai, Cheng - Hsuin |
---|---|
論文名稱: |
不同製程對AZ61/Al2O3P鎂基複合材料機械性質及疲勞之影響 Effect of different manufacturing process on the mechanical properties and fatigue behavior of AZ61/Al2O3p magneisum matrix composites |
指導教授: |
黃崧任
Song-Jeng Huang |
口試委員: |
向四海
Su-Hai Hsiang 周振嘉 Chen-Chia Chou |
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: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 106 |
中文關鍵詞: | 晶粒細化 、等徑轉角擠製(ECAE) 、金屬機複合材料 、鎂合金 、疲勞 |
外文關鍵詞: | grain refinement, ECAE, metal-matrix composites, magnesium alloy, fatigue |
相關次數: | 點閱:381 下載:5 |
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鎂合金在金屬成形技術上受到限制的最主要原因是其原子係以六方最密堆積的方式排列。因此鎂合金在室溫下延性非常低、不易成形。而為了增加鎂合金的機械性質,目前有許多的研究使用大量塑性變形法來進行鎂合金機械性質的改善。等徑轉角擠製(Equal channel angular extrusion,ECAE)為眾多大量塑性變形法中最為簡單方便的一種方法,而且ECAE 所需的外力較小,並且可以藉由改變模具參數控制試片的顯微組織。
本研究選用奈米級氧化鋁顆粒(Al2O3p)材料做為強化相,並以攪拌鑄造法的製程將強化相以攪拌的方式融入AZ61熔湯中,最後模具成型。再利用等徑轉角擠製(ECAE)的製程對添加不同氧化鋁顆粒含量的鎂基複合材料進行擠製。由結果顯示,AZ61/5wt%Al2O3p鎂基複合材料的鑄造態,其硬度、降伏強度、極限強度及伸長率均比母材獲得提升。對AZ61/5wt%Al2O3p鎂基複合材料進行ECAE,因動態再結晶及差排之影響,經過四次ECAE擠製後平均晶粒尺寸由27.2μm可均勻細化至5.1μm。
AZ61鎂基複合材料的強度以及延性皆會隨著ECAE 次數的增加而明顯提升,本實驗四次ECAE 後,可獲得最佳的為性質AZ61鎂合金添加5wt%Al2O3p:硬度值由鑄錠的69HV 增加至97.6HV;拉伸性質的部分,最大抗拉強度由242.3MPa 增加至335.4MPa;降伏強度由95.5MPa 增加至168.3MPa;延展率由15%增加至25%。
疲勞性質方面,複材隨著顆粒重量百分比的增加,壽命也有明顯的提升,本實驗AZ61加入5wt%Al2O3p經過ECAE擠製後,當最大負載72MPa,應力比為0.1,擁有最高的壽命高達618236 cycles。
由強化機制之貢獻度計算後,可得知熱膨脹係數差異影響最大,而Hall-Petch之晶粒強化次之,Orowan之散步強化第三。
This paper studies the mechanical properties enhancement of AZ61/Al2O3p magnesium metal-matrix nanocomposites by different manufacturing process. Equal Channel Angular Extrusion (ECAE) is a useful technique to produce bulk nano-structured materials by severe plastic deformation. The present magnesium metal matrix composites (Mg MMCs) with 1, 2 and 5 wt% of nano-sized Al2O3 particulates for ECAE were fabricated using stir-casting method. Observing the microstructures of MMCs, the more uniform microstructure consisting of grains with a average grain size of ~5μm is observed in the AZ61/5wt% Al2O3p MMC after 4 passes of ECAE. The hardness of MMCs increased evidently with the increase of the weight percentage of Al2O3p additions and ECAE passes. The optimal hardness of AZ61/5wt% Al2O3p MMC after 4 passes has increased to 97.6 HV. The tensile property of MMCs increased evidently with the increase of the weight percentage of Al2O3p additions and ECAE passes. The ultimate strength of AZ61/5wt% Al2O3p MMC after 4 passes has increased to 335.4 MPa. The life of AZ61/5wt% Al2O3p MMC after 4 passes has increased to 618236 cycles.
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