中文摘要：

利用电磁感应磁悬浮熔炼-铜模吸铸法制备Ti40Ni40Cu20非晶复合材料棒状试样,通过X射线衍射（XRD）、金相显微镜和微机控制电子式万能力学试验机研究了不同温度（150,250,350℃）0.5 h退火处理对合金的组织和压缩力学性能的影响。结果表明：铸态和退火处理后试样均有B2-TiNi和B19-TiNi晶体相析出,并且随着退火温度的升高,析出晶体相体积分数和晶粒尺寸都有所增加,同时低温退火能够使马氏体回转为奥氏体;所有合金试样的压缩试验结果均出现了明显的加工硬化现象;随着退火温度升高,合金的抗压强度和压缩塑性经历了先提高后略微下降的变化趋势,但均高于铸态试样,其值分别由铸态的2247 MPa和11.4%提高到150℃退火后的2541 MPa和19.5%。说明选取合适的退火温度能够有效控制合金内部的晶体相体积分数和晶粒尺寸,从而明显提高钛基非晶复合材料的综合力学性能。

英文摘要：

Ti40Ni40Cu20 bulk metallic glass composite rods were prepared by electromagnetic induction levitation melting-copper mold suction casting. Effects of different annealing temperatures（ 150,250,350 ℃, 0.5 h） on microstructure and mechanical properties of Ti-based bulk metallic glass composite were investigated by means of X-ray diffraction （XRD）, metallurgical microscope and the com- puter controlled electronic mechanical testing system. The results showed that, B2-TiNi and B19-TiNi precipitated in ascast and annealing samples, and the volume fraction and grain size of precipitated phase increased after annealing; meanwhile, low-temperature annealing can make the martensite transform to austenite ; compressive test of all alloy samples showed the significant work-hardening; compressive strength and plastic strain first increased and then slightly declined with the increase of annealing temperature, but were better than those of the cast specimens. Compressive strength and plastic strain increased from 2247 MPa and 11.4% of as-cast alloy to 2541 MPa and 19.5% of 150 ℃, 0.5 h annealing alloy. It showed that the suitable annealing temperature could obviously improve the mechanical properties of Ti-based bulk metallic glass composite. It showed that the suitable annealing temperature could effectively control the volume fraction and grain size of precipitated phase, thus obviously improved the comprehensive mechanical properties of Tibased bulk metallic glass composite.