等静压铍材尺寸稳定性研究

Study on Dimensional Stability of Isostatically Pressed Beryllium Material

通过测试等静压铍材的微屈服强度、热膨胀系数及冷热循环尺寸变化,研究其在抵抗负载及温度变化过程中的尺寸稳定性。结果表明:等静压铍材的微屈服强度较高,平均值127.4 MPa,比美国公布的同等铍材高出53.5%。等静压铍材有较低的热膨胀系数,25~100℃温度区间纵向平均线膨胀系数为12.02×10^(-6)/℃,横向平均线膨胀系数为11.89×10^(-6)/℃。等静压铍材进行多次冷热循环后轴向残余应变总量较小,15次循环后约为-18×10^(-6),尺寸热稳定性较好。

By testing the micro-yield strength,thermal expansion coefficient,and dimensional changes of the isostatically pressed beryllium material,its dimensional stability against load and temperature changes was studied.The results show that the micro-yield strength of isostatically pressed beryllium material is relatively high,with an average value of 127.4 MPa,which is 53.5%higher than the equivalent beryllium materials published in the United States.Isostatically pressed beryllium material has a relatively low thermal expansion coefficient,and its longitudinal and horizontal average linear expansion coefficients in the temperature range of 25~100℃are 12.02×10^(-6)/℃and 11.89×10^(-6)/℃,respectively.The total axial resi-dual strain of isostatically pressed beryllium material is small after repeated cooling and heating cycles,about-18×10^(-6)after 15 cycles,and its dimensional thermal stability is excellent.