摘要
利用射流成型法制备出Zr52.5Cu17.9Ni14.6Al10Ti5大块非晶．该合金系统具有很强的玻璃形成能力和宽的过冷区，其玻璃转化温度Tg=650．63K，晶化温度Tx=721．90K,过冷区△Tx＝Tx－Tg＝71．27K．Vicker硬度为558kg／mm‘2压缩断裂强度1730GPa，弹性模量82GPa．观察其断口有大量纹络状河流花样，并有融化的液滴存在．该合金系统大的玻璃形成能力应归功于合金组元的多样性、组元间大的原子半径比率、组元间大的混合负热及在冷却过程中过冷区粘度的急剧上升等因素．
Zr52.5 Cu17.9Ni14.6Al10Ti5 bulk amorphous alloy was prepared by a water-cooled copper mold. The alloy system has an excellent glass formation ability (GFA ) and a wide supercooled liquid region. The glass transition temperature (Tg), the crystallizaion temperature (Tx), the fracture stress, the plastic,Vickers hardness and elastic modulus for the bulk amorphous alloys with a diameter of 3 mm are 377.63 ℃,448.9℃,1 730 MPa, 0.5%, 558 and 82 GPa, respectively The bulk amorphous alloys have good mechanical properties. The excellen glass formation ability of Zr52.5 Cu17.9Ni14.6Al10Ti5 alloys is presumably due to a combination of significatly differen atomic size ratios above about 12%, multicomponent alloy system consisting of more than three elements and optimum negative heats of mixing among the constituent elements.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2000年第3期219-222,共4页
Journal of University of Science and Technology Beijing
基金
国家863计划资助!863-715-005-0130
北京市自然科学基金!2992010
关键词
大块非晶
玻璃形成能力
过冷区
锆基合金
bulk amorphous alloys
glass formation ability
liquid supercooling region
mechanical properties
