铍铜合金抗应力松弛稳定性能及组织的研究

The Stress Relaxation Property and Structure of Cu－ Be Alloys

通过测定进口的 C1720HT态铍铜合金以及国产 QBe2CY铍铜合金时效后的弯曲应力松弛性能，并对应力松弛性能曲线进行了拟合和外推。根据拟合曲线和外推到 1 000 h后的应力松弛极限可以看出， C1720HT态铍铜合金的抗应力松弛性能明显优于国产铍铜合金。从定点金相中看出， C1720HT组织明显均匀，晶粒尺寸大多数在 15～ 45μ m之间。另外，还研究了添加 Co以及不连续析出、温度等对应力松弛性能的影响。

The stress relaxation properties in bend of C1720HT alloy produced in abroad QBe2CY produced in home are measured,and then the property curves are modeled and deduced to 1000 hour. From the modeled property curves and the relaxation maximum limits, we can deduce that the relaxation property of C1720HT alloy is better is better than that of QBe2CY alloy. From the metallographic photos, they acn be shown that C1720HT alloy's microstructure is even obviously and the range of microstructuresizeis most between 15 um and 45um. What is more, the effects of adding Co, discontinuous precipitation and temperature to the stress relaxation are studied.