顯微硬度的影響
(廣東工業(yè)大學(xué) 材料與能源學(xué)院， 廣州 510006)
摘 要: 用銅模吸鑄法制備直徑2~3 mm的Cu60-xZr30Ti10M2 (M=Mg、 Al、 Sn)系列非晶合金。 用X射線衍射、 差式掃描量熱儀和硬度實驗等研究它們的非晶形成能力、 熱穩(wěn)定性與顯微硬度。 該系列非晶合金均表現(xiàn)出兩級晶化行為。 Cu60Zr30Ti10的玻璃轉(zhuǎn)變溫度為426.5 ℃， 晶化起始溫度為467.7 ℃， 過冷液相區(qū)為41.2 ℃。 添加Mg、 Mo、 Al對過冷液相區(qū)影響比較小， 而添加Sn則使過冷液相區(qū)明顯增大， 達到51.6 ℃， 合金的非晶形成能力有較明顯提高， 熱穩(wěn)定性增強。 Cu60Zr30Ti10非晶合金的顯微硬度為HV594.3， 添加2%(摩爾分?jǐn)?shù))的Mg、 Mo和Al對顯微硬度影響不大， 而添加2%Sn(摩爾分?jǐn)?shù))卻使顯微硬度達到HV755.7， 提高27%。
關(guān)鍵字: Cu60-xZr30Ti10M2合金; 塊體非晶合金; 非晶形成能力; 顯微硬度
（Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China）
Abstract: A series of bulk amorphous alloys Cu60-xZr30Ti10M2 (M=Mg, Mo, Al, Sn) with a diameter within 2 to 3 mm can be produced by copper mould sucking cast. The glass forming ability, thermal stability and microhardness were investigated using X-ray diffractometer, differential scanning calorimeter and microhardness tester. All Cu60-xZr30Ti10M2 amorphous alloys show a two-stage crystallization behavior. For amorphous alloy Cu60Zr30Ti10, the glass transition temperature is 426.5 ℃, the onset of crystallization temperature Tx is 467.7 ℃, the super-cooled region ΔTx is 41.2 ℃. The introduction of Mg, Mo and Al has relatively small influence on ΔTx, whereas the introduction of Sn can enhance ΔTx from 41.2 ℃ to 51.6 ℃， indicating that the glass forming ability is improved and the thermal stability is also increased. The microhardness of Cu60Zr30Ti10 is HV594.3, and the introduction of 2% (mole fraction) alloying elements, namely Mg, Mo and Al, plays no apparent influence on the microhardness, however, the introduction of 2%Sn (mole fraction) can markedly increase the microhardness by 27% to HV755.7.
Key words: Cu60-xZr30Ti10M2(M=Mg, Mo, Sn, Al) alloy; bulk amorphous alloy; glass forming ability; microhardness
