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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/10354

Title: 機械合金法合成非晶質鋁鋯及鋁鉿合金之研究
The Formation of Amorphous Al-Zr and Al-Hf Alloys by Mechanical Alloying
Authors: 李丕耀
Contributors: NTOU:Department of Mechanical and Mechatronic Engineering
國立臺灣海洋大學:機械與機電工程學系
Keywords: 機械合金化;鋁基合金;非晶質合金;球磨機
Mechanical alloying;Aluminum base alloy;Amorphous alloy;Ball mill
Date: 1993
Issue Date: 2011-06-28T07:38:30Z
Publisher: 行政院國家科學委員會
Abstract: 利用高能量球磨機對鋯鋁和鋁鉿合金系進行機械合金處理發現:(1)鋯鋁純元素混合粉末經震動式球磨機進行機械合金處理後,若使用99.9%鋯粉為起始粉末則可合成Zr/sub 70/Al/sub 30/和Zr/sub 80/Al/sub 20/非晶質合金粉末,若起始粉末改為98%鋯粉則可合成Zr/sub 40/Al/sub 60/ Zr/sub 50/Al/sub 50/非晶質合金粉末;當球磨機改為行星式球磨機時,在Zr/sub 25/Al/sub 75/-Zr/sub 50/Al/sub 50/之組成範圍內並無合金現象產生,在Zr/sub 60/Al/sub 40/和Zr/sub 80/Al/sub 20/組成上則形成鋯基過飽和固溶體。(2)球磨氣氛中,氧含量的適度增加可提高Zr/sub 60/Al/sub 40/混合粉末於短時間的非晶質化速率,但是在純氬氣、大氣和長時間球磨下仍無法形成Zr/sub 60/Al/sub 40/非晶質合金粉末。(3)Hf-Al純元素混合粉末經震動式球磨機球磨後,可形成Hf/sub 50/Al/sub 50/和Hf/sub 80/Al/sub 20/非晶質合金粉末,在Hf/sub 25/Al/sub 75/則只形成Hf基過飽和固溶體。
Amorphization of Aluminium-based alloys is studied by mechanical alloying of pure elemental powder in the aluminium-zirconium and aluminium-hafnium binary alloy system. Mechanical alloying is carried out by shaker ball mill and planetary ball mill. The following results were obtained: (1) Amorphous Zr-Al alloy powder can be prepared at the compositions Zr/sub 80/Al/sub 20/ and Zr/sub 70/Al/sub 30/ by ball milling the mixture of pure Al and Zr powder with a shaker ball mill. The amorphization range can be expanded from Zr/sub 60/Al/sub 40/ to Zr/sub 40/Al/sub 60/ with same procedure when starting material is mixtures of pure Al and Zr powders. (2) The formation of amorphous Zr-Al alloy powder is not successful when the planetary ball mill was employed as milling tool. No alloying behavior was observed in the composition range Zr/sub 25/Al/sub 75/-Zr/sub 50/Al/sub 50/. Only Zr-based supersaturated solid solution were formed at compositions Zr/sub 60/Al/sub 40/ and Zr/sub 80/Al/sub 20/. (3) Different ball-milling atmosphere lead to different amorphization transformation path on the mechanical alloying of Zr/sub 60/Al/sub 40/ powders. It is impossible to prepare amorphous powder under pure argon and air atmospheres. The existence of suitable amount oxygen can increase the amorphization rate of Zr/sub 60/Al/sub 40/ powders at short milling stage. No Zr/sub 60/Al/sub 40/ amorphous powder was formed with long-term milling operation. (4) Mechanical alloying of mixtures of Hf and Al powders with shaker ball mill lead to the formation of Hf/sub 50/Al/sub 50/ and Hf/sub 80/Al/sub 20/ amorphous powders. A Hf-based supersaturated solid solution phase was obtained at the aluminium-rich composition Hf/sub 25/Al/sub 75/.
Relation: NSC82-0405-E019-011
URI: http://ntour.ntou.edu.tw/ir/handle/987654321/10354
Appears in Collections:[機械與機電工程學系] 研究計畫

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