李先雨,郝刚领,王伟国.Ti/Al复合粉末压坯低温烧结过程的内耗特征[J].有色金属工程,2019,9(9):.
Ti/Al复合粉末压坯低温烧结过程的内耗特征
The internal friction behaviors of Ti/Al composite powder compact during low-temperature sintering process
投稿时间:2019-03-05  修订日期:2019-03-25
DOI:
中文关键词:  内耗  Ti/Al复合粉末压坯  内应力  界面  扩散反应
英文关键词:internal friction  Ti/Al composite powder compact  internal stress  interface  diffusion reaction
基金项目:陕西省教育厅专项科学研究计划(17JK0870)作者简介李先雨,男,在读博士,讲师,研究方向为金属基复合材料;Email:lixianyu_631@126.com *,郝刚领1,王伟国1
        
作者单位
李先雨 延安大学 物理与电子学院
郝刚领 延安大学 物理与电子学院
王伟国 延安大学 物理与电子学院
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中文摘要:
      为探究低温阶段Ti/Al之间的烧结机理,论文基于内耗测量技术系统研究了Ti/Al复合粉末压坯低温内耗行为。研究结果表明,Ti/Al粉末压坯的内耗性能具有明显的温度效应,升温测量过程中270oC附近出现的不可逆内耗峰峰值随频率的增加而下降,随Al含量的增加而增加,该内耗峰是由应力释放引起的,是一个应力型内耗峰。降温过程230oC附近出现的内耗峰峰位随频率的增大向高温方向移动,具有一定的弛豫特征,该内耗峰源于Ti/Al复合粉末压坯升温过程由再结晶形成的Al晶界的滑移。
英文摘要:
      Aiming to understand the sintering mechanism between Ti and Al, the low temperature internal friction behaviors of Ti/Al composite powder compact were investigated systemically based on internal friction measurements in the present paper. The experimental results show that the internal friction behaviors of the Ti/Al composite powder compact could be affected significantly by temperature. The value of the irreversible internal friction peak at about 270oC decreases with increasing frequencies and increases with increasing Al contents. Thus, it is suggested that this internal friction peak is attributed to residual stress relaxation during heating process. Meanwhile, the temperature position of the internal friction peak at about 230oC during cooling process shifts to high temperature, which has a slight relaxation characteristic. It can be concluded that the internal friction peak originates from sliding of grain boundary formed due to recrystallization during sintering process.
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