Cu基大块金属玻璃组分设计与热力学行为  

Component Design and Thermodynamic Behavior of Cu-based Bulk Metallic Glass

作　　者：李培友[1] 童婷[1] 王永善[1] 

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000

出　　处：《热加工工艺》2017年第22期52-55,60,共5页Hot Working Technology

基　　金：陕西省教育厅专项资金资助项目(16JK1152);陕西理工大学博士启动经费资助项目(SLGKYQD2-22)

摘　　要：采用"二元共晶混合"法设计Cu基Cu_(51.31)Ni_(6.48)Ti_(27.77)Zr_(14.44)、Cu_(51.93)Ni_(6.25)Ti_(27)Zr_(14.82)、Cu_(52.55)Ni_6Ti_(26.25)Zr_(15.2)和Cu_(53.17)Ni_(5.76)Ti_(25.49)Zr_(15.58)合金组分,用水冷铜模铸造法制备出直径为3 mm的合金棒。采用X射线衍射仪表征该合金的微结构,采用DSC和DTA测试热力学数据。结果表明,富Cu基大块金属玻璃具有较高的玻璃形成能力,其临界直径可达3 mm,其过冷液态区ΔT_x最大值和参数γ最大值分别为49 K和0.400。由于4个合金的玻璃形成能力差别不大,故表征玻璃形成能力的热力学参数ΔG值也差别不大,且最低的ΔG值对应着具有较好玻璃形成能力的合金。Cu（51.31）Ni（6.48）Ti（27.77）Zr（14.44）、Cu（51.93）Ni（6.25）Ti（27）Zr（14.82）、Cu（52.55）Ni6Ti（26.25）Zr（15.2）,Cu（53.17）Ni（5.76）Ti（25.49）Zr（15.58） alloys were designed based on ＂binary eutectic mixture＂ method. The alloy rods with the diameter of 3 mm were prepared by water-cooled copper mold casting. The microstructure of the alloy was characterized by X-ray diffraction, and the thermodynamic data were tested by DSC and DTA. The results show that rich Cu-based bulk metallic glasses have high glass forming ability, the critical diameter can reach 3 mm; the maximal value of super-cooled liquid region ATx and parameter y value are 49 K and 0.400, respectively. Because the difference of glass forming ability of the four alloYs is little, the difference of △G values, which can characterize the glass formation ability of the thermodynamic parameters, is also little, and the lower value of ziG corresponds to the alloy with better glass forming ability.

关 键 词：大块金属玻璃 二元共晶 玻璃形成能力 热力学 

分 类 号：TG139.8[一般工业技术—材料科学与工程]