Diffusion Mechanisms in Amorphous Ni-Zr Alloys

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Title:	Diffusion Mechanisms in Amorphous Ni-Zr Alloys 非晶形合金材質中的擴散機制
Authors:	吳慧敏
Contributors:	物理系
Keywords:	非晶形合金材質擴散機制
Date:	1997-05
Issue Date:	2016-04-12 12:58:51 (UTC+8)
Abstract:	在使用鈷，銅，鉿為追蹤元素之擴散研究中顯示，非晶形鎳鋯合金材質中原子半徑小者之擴散行為與大原子完全不同。小原子之擴散機制應以原子間之間隙為主而大原子則必須仰賴集體多原子重組的方式擴散。小原子之擴散係數與非晶合金之結晶溫度呈現極強之關連性，反之大原子則無此效應，此一現象顯示非晶形鎳鋯合金之結晶，乃是由成份中之小原子的擴散所控制，並非一般認為的以大原子擴散為主。此結果將有助於了解非晶合金材料之特性及其穩定性。 Strong correlation of the diffusion coefficient of small atoms and the crystallization temperature suggests that the crystallization of amorphous -Ni-Zr alloy (a-Ni-Zr) is controlled by the diffusion of the small constituent of the alloy rather by the contituent with large size. Different diffusion behavior of small atoms, Co and Cu and a large atom, Hf, in a-Ni-Zr indicates that the diffusion mechanisms of small and large atoms in amorphous Ni-Zr matrix are different. It is suggested that small atoms diffuse by interstitial -like (localized difect) mechanism, and large atoms diffuse by collective rearrangement of many atoms.
Relation:	華岡理科學報 14 民86.05 頁223-244
Appears in Collections:	[Department of Physics ] journal articles

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