(1. 常州大學(xué) 機(jī)械工程學(xué)院，常州 213164；
2. 常州大學(xué) 石油化工學(xué)院測試中心，常州 213164)
摘 要: 采用四電極電阻法研究Al85Ni5Y8Co2合金熔體電阻率，并結(jié)合X射線衍射儀(XRD)和差示掃描量熱儀(DSC)探索熔體結(jié)構(gòu)變化對Al85Ni5Y8Co2非晶晶化行為的影響。結(jié)果表明：Al85Ni5Y8Co2合金在1135~1357 K溫度區(qū)間內(nèi)發(fā)生熔體結(jié)構(gòu)變化，而熔體結(jié)構(gòu)變化導(dǎo)致Al85Ni5Y8Co2非晶晶化行為存在差異；在熔體溫度為1673 K下制備的非晶薄帶第一晶化較1323 K和1523 K的明顯提前，對激活能的計(jì)算證實(shí)其初晶化更容易析出FCC-Al，且更難析出Al2Y3、Al13Co4、Al9Co2和AlNi等脆性金屬間化合物；通過XRD的測試發(fā)現(xiàn)高的熔體溫度可能會(huì)導(dǎo)致熔體中原子團(tuán)簇的破壞，從而引起非晶晶化行為的改變。
關(guān)鍵字: 熔體結(jié)構(gòu)；晶化行為；激活能；原子團(tuán)簇
（1. College of Mechanical Engineering, Changzhou University, Changzhou 213164, China;
2. Testing Center of Petrochemical College, Changzhou University, Changzhou 213164, China）
Abstract:The electrical resistivity of Al85Ni5Y8Co2 melt was studied by four-electrode electrical resistivity method. The effect of melt structure transition on the crystallization behavior of Al85Ni5Y8Co2 amorphous alloys was investigated by both X-ray diffractometer(XRD) and differential scanning calorimetry(DSC) measurements. The result shows that the melt structure of Al85Ni5Y8Co2 alloy changes within temperature range from 1135 K to 1357 K. The crystallization behavior of Al85Ni5Y8Co2 amorphous alloys is different due to the change of melt structure: the first crystallization of amorphous ribbon prepared at 1673 K is obviously earlier than that prepared at 1323 K and 1523 K. The calculation of activation energy confirms that the primary crystallization of Al85Ni5Y8Co2 alloy is easier to precipitate FCC-Al and harder to precipitate brittle intermetallic compounds, such as Al2Y3, Al13Co4 and AlNi. The XRD measurements show that high melt temperature may lead to the destruction of atomic clusters in the melt, which may lead to the change of crystallization behavior.
Key words: melt structure; crystallization behavior; activation energy; atomic cluster
