采用铜模吸铸法制备了Cu40Zr44Al8Ag8非晶复合材料(BMGCs),在玻璃转变温度(Tg)退火不同时间(5,10,15,20,25,40,60,85min)后,采用单轴压缩实验测试了试样退火前后的力学性能,并利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和同步差示扫描量热仪(DSC)等手段对退火前后试样的显微结构和断口形貌进行分析.结果发现:所制备铸态试样主要为非晶结构,非晶基体中弥散分布着少量的纳米级及微米级的Al3Zr金属间化合物.随着退火的进行,非晶复合材料中微米级晶体相的尺寸和形貌并不发生变化,这些晶体相是裂纹形成的源泉;但是纳米级晶体相不断增加,最终析出产物相为Al3Zr,Cu10Zr7和Ag3Al相.非晶复合材料中自由体积与析出晶体相共同控制着该BMGCs的力学性能.退火初期,试样的强度和塑性缓慢增长,至退火15 min时达到极值,最高强度达到1.77 GPa,最大塑性应变量达到1.67％;但是继续退火,试样内自由体积大量减少,强度和塑性均迅速下降;其断裂方式也由单一剪切面断裂转变为多剪切面断裂,最后发生脆性劈裂.
参考文献
| [1] | XIE Zhiwei,ZHANG Yongzhang,YANG Yuanzheng,CHEN Xianzhao,TAO Pingjun.Effects of rare-earth elements on the glass-forming ability and mechanical properties of Cu46Zr47-xAl7Mx (M = Ce, Pr, Tb, and Gd) bulk metallic glasses[J].稀有金属（英文版）,2010(05):444-450. |
| [2] | 于朋,寇生中,赵燕春,姚建忠,高凯雄,李林.结构弛豫对Cu36Zr48Ag8Al8块状非晶合金组织结构和力学性能的影响[J].中国铸造装备与技术,2012(02):49-53. |
| [3] | 袁小鹏,寇生中,赵燕春,李春燕,于朋,蒲永亮,徐娇.Cu46Zr44Al5Nb5块体非晶合金的晶化行为研究[J].稀有金属,2013(05):738-743. |
| [4] | Antonione C.;Rizzi P.;Baricco M.;Battezzati L.;Spriano S. .Phase separation in multicomponent amorphous alloys[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,1998(0):127-132. |
| [5] | 刘勇,张丽,徐春水,杨湘杰.深冷处理对Cu40Zr44Ag8Al8非晶复合材料组织和力学性能的影响[J].中国科学（物理学 力学 天文学）,2012(06):577-582. |
| [6] | Laws KJ;Gun B;Ferry M .Mechanical stability of Ca65Mg15Zn20 bulk metallic glass during deformation in the supercooled liquid region[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):198-204. |
| [7] | Yaoqi Li;Min Song;Yuehui He .Effect of quenching mode on the mechanical properties of a Zr_(64)Al_(10)Ni_(15)Cu_(11) metallic glass[J].Materials & design,2010(7):p.3555. |
| [8] | Abrosimova GE;Kobelev NP;Kolyvanov EL;Khonik VA .The influence of heat treatment on the ultrasonic velocity and elastic moduli of a Zr-Cu-Ni-Al-Ti bulk metallic glass[J].Physics of the solid state,2004(10):1859-1862. |
| [9] | 杨英俊,邢大伟,王刚,孙剑飞,魏思东,沈军.铜基大块非晶合金的压缩断裂行为[J].稀有金属材料与工程,2007(06):1029-1032. |
| [10] | R. T. Ott;F. Sansoz;J.F. Molinari .Micromechanics of deformation of metallic-glass-matrix composites from in situ synchrotron strain measurements and finite element modeling[J].Acta materialia,2005(7):1883-1893. |
| [11] | Z. Zhu;H. Zhang;Z. Hu .Ta-particulate reinforced Zr-based bulk metallic glass matrix composite with tensile plasticity[J].Scripta materialia,2010(5):278-281. |
| [12] | Z.F. Zhang;J. Eckert;L. Schultz .Difference in compressive and tensile fracture mechanisms of Zr_(59)Cu_(20)Al_(10)Ni_8Ti_3 bulk metallic glass[J].Acta materialia,2003(4):1167-1179. |
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