Cu基大块金属玻璃组分设计与热力学行为
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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)Ni_6Ti_(26.25)Zr_(15.2),Cu_(53.17)Ni_(5.76)Ti_(25.49)Zr_(15.58)and 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 regionΔT_xand parameterγvalue are 49 K and 0.400,respectively.Because the difference of glass forming ability of the four alloys is little,the difference ofΔG values,which can characterize the glass formation ability of the thermodynamic parameters,is also little,and the lower value ofΔG corresponds to the alloy with better glass forming ability.
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),Cu_(53.17)Ni_(5.76)Ti_(25.49)Zr_(15.58)and 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 regionΔT_xand parameterγvalue are 49 K and 0.400,respectively.Because the difference of glass forming ability of the four alloys is little,the difference ofΔG values,which can characterize the glass formation ability of the thermodynamic parameters,is also little,and the lower value ofΔG corresponds to the alloy with better glass forming ability.
引文
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[3]马腾,马胜国,刘用,等.内生枝晶增韧非晶基复合材料的摩擦磨[J].金属热处理,2014,41(2):75-79.
[4]Li L X,L iu R P,Zhao J L,et al.Effects of Nb addition on glass-forming ability,thermal stability and mechanical properties of Ti-based bulk metallic glasses[J].Rare Metal Materials and Engineering,2014,43(8):1835-1838.
[5]Inoue A.Bulk amorphous alloys-preparation and fundamental characteristics[M].Switzerland:Trans Tech Publications Ltd.,1998.
[6]Li P Y,Meng F Y,Wang Y S,et al.Glass forming ability and thermodynamic properties in novel La-Al-Cu-Co bulk metallic glasses[J].Journal of Rare Earths,2015,33(9):972-976.
[7]李培友.Cu添加对La-Al-Ni合金玻璃形成能力的影响[J].铸造技术,2016,37(3):417-420.
[8]李培友,孟凡莹,王永善.La-Al-Cu-Ni合金玻璃形成能力与力学性能[J].材料热处理学报,2016,37(4):27-31.
[9]Shen J,Zou J,Ye L,et al.Glass-forming ability and thermal stability of a new bulk metallic glass in the quaternary Zr-Cu-Ni-Al [J].Journal of Non-Crystalline Solids,2005,351:2519-2523.
[10]Li P Y,Wang G,Ding D,et al.Glass forming ability and thermodynamics in the new Ti-Cu-Ni-Zr bulk metallic glasses[J].Journal of Non-Cryst Solids,2012,358:3200-3204.
[11]Lu Z P,Shen J,Xing D W,et al.Binary eutectic clusters and glass formation in ideal glass-forming liquids[J].Applied Physics Letters,2006,89:071910.
[12]Inoue A.High strength bulk amorphous alloys with low critical cooling rates[J].Materials Transactions JIM,1995,36:866-867.
[13]Turnbull D.Under what conditions can a glass be formed[J].Contempt Physial,1969,10:473-478.
[14]Lu Z P,Liu C T.A new glass-forming ability of materials:a thermodynamic glasses[J].Acta Materialia,2002,50:3501-351.
[15]Li P Y,Wang G,Ding D,et al.Determination of accurate theoretical values for thermodynamic properties in bulk metallic glasses[J].Advances in Manufacturing,2013(1):293-304.