一般壓鑄廠在大量的使用AZ91D回收鎂合金材料的過程中，發現材料廠商所供應的回收材料雖然能滿足標準規範，但對添加之回收材之不同會影響壓鑄件品質，卻對於其影響原因所知有限。
本研究主要是為了解使用AZ91D回收鎂合金材料對於壓鑄件的機械性能及耐蝕性的影響程度，進行追蹤探討。針對市場上風評較好三家廠牌的AZ91D材料與自製的100%純鎂材料、30%純鎂材料及70%回收材之混合材、70%純鎂材料及30%回收材之混合材和100%回收材料等四種型式之AZ91D材料，將鑄錠製成各式試片；同時透過模具之壓鑄加工擠製出試驗試棒，進行成份分析、金相分析、拉伸測試、耐衝擊試驗、硬度分析、耐蝕性試驗予以比較，藉以了解其特性及影響。
本研究透過大量的試驗數據分析顯示，影響材料特性的除了Al、Mn、Zn、Si、Fe、Ni、Cu等成份外，回收材料受壓鑄製程氧化、柱塞油、脫模劑等污染的影響及其熔煉中助熔劑所導致的殘留雜質物含量對於材料影響度最為明顯。為合理的使用AZ91D全回收鎂合金材料，有效的降低製造成本，本論文所獲得之研究成果可以提供從事回收材料的製造廠及壓鑄廠作為參考資料。

In general die casting factory, large volume of recycling AZ91D magnesium alloy materials were used. Although the recycled manufacturing supplier’s materials meet the standard norm, due to the difference of recycled material used the quality of the die casting parts was influenced widely and the understanding of the causes are limitedly.
The main purpose of this research is to understand the influences of recycling AZ91D magnesium alloy to the mechanical property and corrosion resistance of the die casting parts. By choosing three existing reputed brand AZ91D material, to compare with own manufacturing magnesium alloy by using 100% pure magnesium, mixture of 30% pure magnesium with 70% recycling magnesium, mixture of 70% pure magnesium with 30% recycling magnesium, and 100% recycling magnesium. Different testing specimens are made by ingot without fabrication and by die-casting process. Through the analysis of chemical compositions, metallography, tensile strength test, impact test, hardness test and corrosion resistance testing, we try to clarify the characteristic of different combination of magnesium.
From the analysis of a large number of test data, we realign that the main compositions like Al, Mn, Zn, Si, Fe, Ni, Cu, etc. which can influence the properties of the die-casting parts. Besides, the pollution of casting oxides, plunger lubrication oil and die release agents during die-casting process and the impurities of flux and residue during smelting are also influence the properties of the parts. To widen the use of all recycling AZ91D magnesium alloy can significantly reduce the manufacturing cost. The results detained in this study can be offered to the recycled material manufacturer and die casting factory for reference.

[01] 陳振華，“鎂合金”，化學工業出版社。
[02] K. Kimura, K. Nishii and M. Kawarada, “Recycling Magnesium Alloy Housings for Notebook Computers”, Fujitsu Sci. Tech. J., 38, 1, pp. 102-111
[03] B.A. Shaw, “Corrosion of Magnesium and Magnesium-Base Alloys”, ASM Handbook, Vol.13B, Corrosion: Materials, pp. 205-226
[04] G. Shalev, N. Moscovitch, B. Bronfin, Z. Rybibovich and E. Aghion, “Fluxless Recycling of Creep Resistant Die Casting Magnesium Alloys MRI 153M & MRI 230D”, Dead Sea Magnesium Ltd, 12th Magnesium Automotive and End User Seminar.
[05] Y.J. Huang, B.H. Hu, I. Pinwill, W. Zhou and D.M.R. Taplin, “Effect of process settings on the porosity levels of AM60B magnesium die castings”, Materials and Manufacturing Processes, Vol.15, No.1, 2000, pp. 97-105
[06] M. Avalle et al, “Static and fatigue strength of a die cast aluminium alloy under different feeding conditions”, Journal of Materials:Design and Applications, Vol.216, No.1, 2002, pp. 25-30.
[07] A.K. Dahle, S. Sannes, D.H. St. John and H. Westengen, “Formation of defect bands in high pressure die cast magnesium alloys”, Journals of Light Metals, 1, 2001, pp. 99-103
[08] 黃朝煌，“鋁合金壓鑄輪圈及引擎汽缸之模流分析”，國立中央大學機械所碩士論文，民國94年6月
[09] 吳承建，陳國良，強文江 “金屬材料學”，北京：冶金工業出版社，2000
[10] 熊家炯，“材料設計”，天津：天津大學出版社，2000
[11] 李月珠，“快速凝固技術和材料”，北京：國防工業出版社，1993
[12] 《有色金屬及其熱處理》編寫組有色金屬及其熱處理，北京：國防工業出版社，1981
[13] Robert L. Edger Global, “Overview on demand and applications for magnesium alloys”﹐ Magnesium alloys and their applications, 2000, pp. 3-8
[14] 王凱弘，“應用AZ31鎂合金成形性資料於沖鍛3C殼件之開發”，金屬工業研究發展中心金屬成形組，民國九十一年。
[15] B. L. Mordike, T. Ebert, “Magnesium Properties applications potential, Materials Science and Engineering”, 2001, A302, pp. 37-45
[16] B. Closset, “Mechanical properties of extruded magnesium alloys”, Magnesium alloys and their applications, 2000, pp. 274-279
[17] W. Wagener, D. Hartmann, F. Lehnert, “Mechanical propeties of magnesium alloys processed by semi-solid casting”, Magnesium alloys and their applications, 2000, pp. 291-295
[18] E. El-magd, M. Abouridouane, “Compression test on magnesium alloy MgAl8Zn at high strain rates and temperatures”, Magnesium alloys and their applications, 2000, pp. 324-329
[19] 光明，“鎂合金的功能特性”，金屬功能材料，1999, 5: pp. 237-238。
[20] M. Bretmann, B. Reinhold, H. Schnattinger, “ The use of magnesium in cars-Aspects of Corrosion”, Magnesium alloys and their applications, 2000, pp. 271-273
[21] 魏汝超，“鎂合金之熱機處理與退火處理的顯微組織研究”，台灣大學碩士論文，民國九十二年。
[22] 劉文勝，“AZ61鎂合金的疲勞性質與破壞分析”，中央大學碩士論文，民國八十九年。
[23] http://www.Noranda.com/

[24] 林煜昆，壓鑄技術實務，徐氏基金會出版，民國72年，pp. 75-79。
[25] http://stuff.mit.edu /afs/athena/course/2/2.810/OldFiles/ts_temp/
Casting.ppt#256,1,Casting
[26] A. Dworog, M. Kothen, D. Hartmann, “Semi solid injection molding of magnesium alloys”, Magnesium alloys and their applications﹐2000﹐pp. 577-583
[27] http://www.jsw.co.jp

[28] http://www.magmasoft.com/

[29] 賴耿陽 編著， “金屬壓鑄技術”，再版，復漢出版社，民國85年2月，pp. 153-156。
[30] 莊水旺、王志名， “CAE模流軟體在壓鑄模具設計之應用”，工業材料174期，民國90年6月，pp. 113-117