鎂基非晶質合金擁有良好的玻璃形成能力，且具有低冷卻速率形成非晶態的特性，而本研究經由雙氣體霧化法製備出鎂銅釓金屬玻璃的非晶質粉末，已可達到89%的產率，由感應耦合電漿質譜儀(ICP)鑑定成分均勻，確定其組成為Mg67.4Cu23.3Gd9.4，且X光繞射分析(XRD)檢測為完全非晶，而示差掃描量熱法(DSC)分析熱性質，得知材料的玻璃轉換溫度、結晶溫度以及孕核時間，並計算Trg及γ等參數，評估此金屬玻璃的玻璃形成能力(GFA)。
將氣體霧化製程得到的Mg67.4Cu23.3Gd9.4非晶質金屬玻璃粉末，進行熱壓及擠型製程，製備金屬玻璃複合材(BMGC)，探討其受不同擠型參數下，應力與應變誘發結晶對機械性質的影響，而由穿透式電子顯微鏡(TEM)及X光繞射分析(XRD)檢測得知，應力與應變誘發結晶之奈米晶為介穩態的Mg2Cu相。

SUMMARY
Mg-Cu-Gd metallic glass powders were synthesized by Rapid-Solidifying Atomization (RSA). The RSAed powder was fully amorphous shown by X-Ray Diffractometry (XRD), and the glass transition temperature (Tg), crystallization temperature (Tx) and incubation time were determined by Differential Scanning Calorimeter (DSC). The value of Trg and γwere criterion with the glass forming ability (GFA) of Mg-based metallic glass. The Mg-Cu-Gd in situ bulk metallic glass composite (BMGC) consolidated by backward extrusion. The microstructure of the stress-induced nano-crystalline/amorphous composites was studied by Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM), and the crystalline phases of the Mg-rich nanocrystals were shown metastable Mg2Cu phase by XRD.
Key word: Rapid-Solidifying Atomization, Mg-based BMGC, Nanocrystal, Stress-induced Crystallization

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