- 期刊
銅-鋁-銀三元合金系統於500℃下的相平衡
Phase Equilibria of Cu-Al-Ag Ternary System at 500℃
摘要
塊材金屬玻璃（bulk metallic glass, BMG）因擁有高強度、耐磨耗、特殊的磁性質、耐腐蝕性與良好的機械性質，引以廣泛的注意。銅基系統金屬玻璃，因較大過冷液態區，價格低廉與製備簡易，為目前熱門金屬玻璃材料系統之一。而鋁與銀則是常被作添加於銅基金屬玻璃系統中，用以調整銅基金屬玻璃的性質。相平衡圖是將平衡相存在之區域以系統參數所表現出來的圖，是基礎研究中非常重要的一環。本研究探討銅- 鋁-銀三元和金系統於500℃下之相平衡，用以與非晶結果相比較。首先利用電弧熔融法（arc-melting） 製作32組不同組成之銅- 鋁- 銀三元合金，將合金放置在高溫爐中500℃下時效熱處理1440小時，以期合金中各相達到平衡狀態。經時效後的合金先以X-ray繞射儀（XRD）鑑定合金平衡相之結構，再以掃描式電子顯微鏡（SEM）觀察表面微結構，並配合能量分散能譜儀（EDS）分析平衡相之組成。運用實驗所得之XRD與SEM/EDS所得分結果，並與銅- 銀、銅- 鋁、鋁- 銀等二元相圖加以比對，用以確立銅- 鋁- 銀三元系統於500℃下的相平衡。由實驗結果得知，銅- 鋁- 銀三元系統在500℃下的等溫截面相圖存在8個單相區、13個兩相區、6個三相區；而該系統並無三元介金屬相的存在。
並列摘要
Bulk metallic glass (BMG) materials have high strength, good wear resistance, special permeability, good corrosion resistance and excellent mechanical properties. Cu-based alloys have promising ability to form amorphous metallic glasses due to their large super-cooling range, low cost, and simplicity requirement for manufacturing equipments. This is a fundamental research for determining metallic glass regions of Cu based alloys. Ag and Al elements were added into Cu-based alloys to improve Cubase GMG's physical properties. We investigated the phase equilibrium of Cu-Al-Ag ternary system at 500°C. Results of this study were compared with amorphous regions of the Cu-Al-Ag ternary system. The alloys were pulverized and analyzed with an X-ray diffractometer (XRD) to determine their phase structure. A scanning electron microscope (SEM) was used for microstructure examination, while SEM with energy dispersive spectrometer (EDS) was applied for compositional analysis. Microstructures, compositional data, and diffraction patterns were examined to identify the phases present in each equilibrated alloy. Results indicated that there are 8 single-phase, 13 two-phase, and 6 three-phase regions in the Cu-Al-Ag isothermal section at 500°C. No ternary Cu-Ni-Zn iIMC was found in the Cu-Al-Ag ternary system.