摘要
采用单辊甩带法在不同转速下制备Ti40Zr40Ni20合金薄带,通过X射线衍射(XRD)和透射电子显微术(TEM)分析各样品的急冷组织,并结合热分析方法,研究它们加热时的组织演化行为与相变特征。研究结果表明:随着甩带速率从40 m/s下降到10 m/s,Ti40Zr40Ni20薄带样品中依次生成了单相非晶、非晶+β-Ti(Zr)混合相和单相准晶组织;除单相铸态准晶外,前两种急冷组织在温度接近300℃时开始失稳生成纳米尺度的准晶相,当温度上升到540℃附近,组织中出现了cF96-(Zr,Ti)2Ni大单胞面心立方相(点阵参数a≈1.2 nm)。
Microstructure and phase transformation behavior of Ti40Zr40Ni20 ribbon samples prepared by a single roller melt spining at different roll speeds were investigated by means of X-ray diffraction(XRD),transmission electron microscope(TEM) and thermal analysis techniques.The results show that with decreasing nominal roll speed from 40 to 10 m/s,the component phases in the asquenched Ti40Zr40Ni20 ribbons vary from fully amorphous to a mixture of β solid-solution phase and amorphous,and finally to a singlephase icosahedral quasicrystals(IQC).Upon reheating,the melt-spun IQC phase appears stable up to 600 ℃; In the other relatively faster quenched samples,nano-quasicrystallization occurs at about 300 ℃,and a cF96 type(Zr,Ti)2Ni big cube phase(lattice parameter a≈1.2 nm) is formed at 540 ℃.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第12期1-5,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51131002)
教育部留学回国人员科研启动基金
中央高校基础研究基金(DUT12LAB08)
