析出相稳定性对铍材尺寸稳定性的影响

Effects of Precipitates Stability on the Dimensional Stability of Beryllium

铍材由于其优异独特的性能成为高精度仪表的重要材料之一。目前针对铍材的加工、表面处理、精密装配等方面进行了一定的研究,但对铍材的基础特性,尤其是尺寸稳定性的相关研究较少。以目前高精度仪表用铍材为研究对象,通过金相显微镜、透射电子显微镜对铍材的晶粒尺寸、析出相晶体结构进行了分析,采用冷热循环法对铍材的尺寸稳定性进行评价,阐明了相转变对精密构件尺寸稳定性的影响机制。最终采用650℃时效处理后,铍材平均每次温度冲击的尺寸变化量由11.4×10^(-6)减小到6.4×10^(-6)。

Beryllium was one of the important materials for high-precision instruments due to its outstanding and unique properties.It was researched that the processing,surface treatment,and precision assembly of beryllium materials,but there were few related researches on the basic characteristics of beryllium materials,especially on the dimensional stability.Took the current beryllium materials for high-precision instrumentation as the research object,the crystal grain size and precipitated phase crystal structure of the beryllium materials were analyzed by metallographic microscope and transmission electron microscope,and the dimensional stability of the beryllium materials was evaluated by the cold-heat cycle method,the influence mechanism of phase transition on the dimensional stability of precision components was presented.After using 650℃aging treatment,the average size change per temperature shock of the beryllium material was reduced from 11.4×10^(-6)to 6.4×10^(-6).