半固态等温处理块体非晶复合材料的组织结构与性能

发布时间：2018-03-24 23:12

  本文选题：块体非晶复合材料　切入点：塑性　出处：《南昌大学》2015年硕士论文

【摘要】：Ti基非晶合金有比较强的非晶形成能力和良好的力学性能,有着非常广阔的应用前景。本课题以Ti基非晶合金为研究对象,设计了Ti48Zr18V12Cu5Be17块体非晶合金成分,利用真空电弧熔炼-铜模吸铸法制备了Ti48Zr18V12Cu5Be17试样,在半固态温度区间对Ti48Zr18V12Cu5Be17块体非晶复合材料进行了不同温度和不同时间的半固态等温处理实验,利用DSC、XRD和EDS对试样进行表征和分析。研究了半固态等温处理过程中微观组织的演变规律和生长动力学,以及试样室温压缩性能。结论主要包括：(1)利用真空电弧熔炼-铜模吸铸法制备的Ti48Zr18V12Cu5Be17试样为非晶基本和晶体相组成的块体非晶复合材料,且晶体相为BCC结构,主要相为β-Ti和ZrV2。在温度在860。C,保温时间为10mmin时,Ti48Zr18V12Cu5Be17试样中的晶体阳粒子的形状因子最大,为0.7。(2)Ti48Zr18V12Cu5Be17试样在860。C保温10分钟内β-Ti/ZrV2晶粒的生长指数n为2.62,在保温10分钟后的n为3.8；Arrhenius公式形式的β-Ti/ZrV2晶粒生长动力学模型：(3)Ti48Zr18V12Cu5Be17试样在铸态时的塑性为3.74%；在760℃半固态等温处理3mmin后的试样的塑性则增大到4.50%。(4)随着保温时间的延长,Ti48Zr18V12Cu5Be17试样在半固态等温处理过程中的组织演变过程为：非晶基体相熔化→枝晶臂合并→大块状组织→晶界处局部熔化分离→晶粒球化→晶体继续生长→晶粒粗化。
[Abstract]:Ti-base amorphous alloy has strong amorphous forming ability and good mechanical properties, and has a very broad application prospect. In this paper, the Ti48Zr18V12Cu5Be17 bulk amorphous alloy is designed, which is based on Ti-base amorphous alloy. Ti48Zr18V12Cu5Be17 samples were prepared by vacuum arc melting and copper mold suction casting. The isothermal treatment of Ti48Zr18V12Cu5Be17 bulk amorphous composites at different temperatures and different time was carried out in the semisolid temperature range. DSC-XRD and EDS were used to characterize and analyze the samples. The evolution law and growth kinetics of microstructure during semi-solid isothermal treatment were studied. Conclusion: the Ti48Zr18V12Cu5Be17 sample prepared by vacuum arc melting and copper mould suction casting method is a bulk amorphous composite composed of amorphous basic and crystalline phase, and the crystal phase is BCC structure. The main phases are 尾 -Ti and ZrV2.When the temperature is 860.C and the holding time is 10mmin, the shape factor of the crystal positive particles in Ti48Zr18V12Cu5Be17 is the largest. The growth index of 尾 -Ti / ZrV2 grain was 2.62 at 860. C for 10 minutes, and the grain growth kinetics model of 尾 -TiZrV2 in the form of 3. 8 Arrhenius formula for 10 minutes was 尾 -TiZrV2. The plasticity of 尾 -TiTiZrV12 Cu5Be17 sample was 3.74 at 760 鈩，

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