機械合金法合成三元及四元鎂-鎳基非晶質粉末製備之研究

Synthesis of ternary and quaternary Mg-Ni-based amorphous alloys by mechanical alloying technique

張淼源(Miao-yaun Chang)

指導教授 ： 胡家榮

大同大學/工程學院/材料工程學系所/碩士(2007年)

摘要

本研究以機械合金法合成鎂基合金粉末的非晶質化行為和其粉末真空熱壓成型的可行性，利用XRD、SEM及DSC觀察粉末在機械合金過程中的結晶結構、微觀組織與熱穩定性，研究結果經12小時機械合金化處理後，Mg40Ni5Cu35Ti20非晶質合金粉末具有寬廣過冷液態區，ΔTX為85K，在Mg-Ni-Cu-Ti四元合金系統中，隨著鎳含量增加，不易非晶質相生成。將Mg40Ni5Cu35Ti20非晶質合金粉末進行真空熱壓成型，在280℃時，以1.2GPa的熱壓壓力持溫10分鐘，可形成直徑10mm、厚度1mm的緻密非晶質合金塊材，其微硬度可達320 Hv；結果發現隨著熱壓溫度與持溫時間增加，緻密度降低，非晶性愈差。

關鍵字

機械合金 ； 非晶質相 ； 過冷液態區 ； 真空熱壓

並列摘要

This study was to examined of Mg-based alloy powders amorphized by mechanically alloying and the feasibility of fabricating as-milled amorphous powders were then consolidated by vacuum hot pressing. The crystallization structure, microstructure and thermal stability during mechanical alloying of as-milled powders were investigated by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. After 12 hours milled, Mg40Ni5Cu35Ti20 amorphous powders exhibited a wide supercooled liquid region of 85K before crystallization. The as-milled Mg40Ni5Cu35Ti20 powders were consolidated at 280℃ for 10 minutes under a pressure of 1.2GPa by vacuum hot pressing into disc compacts with a diameter and thickness of 10 and 1mm, respectively, and its microhardness is 320 Hv.

並列關鍵字

Mechancial alloying ； Amorphous phase ； Supercooled liguid region ； Vacuum hot pressing

參考文獻

5. H. S. Chen: Mater Sci. Eng., 25 (1976) 59.

6. H. S. Chen: J. Appl. Phys., 49 (1978) 3289.

7. A. Inoue, T. Zhang, and T. Masumoto: Jpn. J. Appl. Phys., 27 (1988) L2248.

10. A. Inoue, T. Zhang, and T. Masumoto: J. Non-Cryst. Solids, 156-158 (1993) 473.

11. A. Inoue, T. Zhang: Mater. Trans., JIM, 37 (1996) 185.