摘要
为改善块体非晶合金的变形能力,应用铜模喷铸工艺制备了原位马氏体CuZr相增强Zr50.5Al9Ni13.05Cu27.45非晶合金复合材料。采用X射线衍射仪、透射电镜、热分析仪、力学试验机、扫描电镜分析了合金的组织结构、热力学性能、压缩力学性能及断裂后形貌等。研究结果表明,增大合金的直径,合金的冷却速度降低,致使颗粒状马氏体CuZr相从非晶基体中析出作为第二相,从而提高了合金的力学性能,压缩断裂强度和应变分别约为2190MPa和8%,这归因于马氏体CuZr相具有大量的共格孪晶界,在变形时能够有效阻碍剪切带局域化扩展,促使和萌生多重剪切带,从而延缓裂纹的萌生和扩展。
Zr50.5Al9Ni13.05Cu27.45 metallic glass matrix composites containing in-situ martensite CuZr phase were prepared by copper mould injection method to improve the deformation ability of bulk metallic glass.Microstructure,thermal behavior,compressive behavior and fracture morphology of the metallic glass composites with different diameters were analyzed by Xray diffraction(XRD),TEM(transmission electron microscope),DSC(differential scanning calorimetry),material testing system and SEM(scanning electron microscope).The results reveal that,with increasing in diameter of the alloy and decreasing in cooling rate,mechanical properties of the bulk metallic glass composites are improved as a result of particle martensite CuZr phase as secondary phase precipitated from the amorphous matrix,where compressive strength and strain reach up to approximately 2190MPa and 8%,respectively,which are attributed to numerous coherent twin boundaries in the CuZr phase effectively restraining localization propagation of shearing band and inducing the seeding and branching of multiple shearing band to delay the generation and propagation of cracks.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第10期883-886,共4页
Special Casting & Nonferrous Alloys
基金
辽宁省创新团队资助项目(2006T104)
辽宁省自然科学基金资助项目(20072037)
辽宁省高等学校优秀人才支持计划资助项目(2008RC36)
