(哈爾濱師范大學(xué) 物理系，哈爾濱 150025)
摘 要: 為了研究大塊非晶合金中成分分離區(qū)的存在狀態(tài)及其在晶化過(guò)程中的作用，應(yīng)用小角X射線散射技術(shù)(SAXS)和差示掃描量熱儀(DSC)研究Cu55Zr30Ti15非晶合金從310 K到783 K之間微結(jié)構(gòu)的演化情況。實(shí)驗(yàn)發(fā)現(xiàn)在淬火狀態(tài)下Cu55Zr30Ti15非晶合金中存在直徑為55 nm左右的成分分離區(qū)。非晶的結(jié)構(gòu)弛豫包括659 K之前的低溫結(jié)構(gòu)弛豫和659 K到玻璃轉(zhuǎn)變溫度的高溫結(jié)構(gòu)弛豫。在玻璃轉(zhuǎn)變溫度到783 K之間，觀察到非晶基體中產(chǎn)生過(guò)渡相并轉(zhuǎn)化為最終晶相的過(guò)程。表明成分分離區(qū)在晶化過(guò)程中有著重要作用，其馳豫所產(chǎn)生的有序原子團(tuán)簇是隨后晶化過(guò)程中晶核產(chǎn)生的基礎(chǔ)。
關(guān)鍵字: Cu55Zr30Ti15非晶合金；小角X射線散射；成分分離區(qū)；結(jié)構(gòu)弛豫
amorphous alloy and its effect
ZHANG Di, NING Qian-yan, CHENG Wei-dong
（Department of Physics, Harbin Normal University, Harbin 150025, China）
Abstract: In order to study the composition segregation regions in bulk metallic glass, small angle X-ray scattering (SAXS) technique and differential scanning calorimetry (DSC) were used to investigate the evolution of microstructure in Cu55Zr30Ti15 amorphous alloy heated from 310 K to 783 K. It is confirmed that the composition segregation regions in the diameter of about 55 nm exist in the as-quenched state. The structural relaxation can be divided into the low temperature structure relaxation in the temperature range from 310 K to 659 K and the high temperature structure relaxation in the temperature range from 659 K to the temperature of glass transition. A transition phase was observed from the supercooled liquid region to 783 K. The results show that the domains with ordered clusters are the base of crystallization.
Key words: Cu55Zr30Ti15 amorphous alloy; small angle X-ray scattering; composition segregation region; structure relaxation
