本文阐述了因7003合金中含有 Ti 而导致该合金管材在大气中放置后自行破裂的实质和为了防止产生破裂而采取的相应的时效制度。通过电镜观察查明了:加 Ti 合金较加 Zr 合金强度提高的原因;加 Zr 合金较加 Ti 合金明显地改善抗应力腐蚀性和合金经均匀化抗应力腐蚀性能反而降低的本质,并阐明了该合金的强化机理。 This article describes the nature of the 7003 alloy containing Ti caused by the alloy tube placed in the air after the rupture of their own and in order to prevent the occurrence of rupture and the corresponding aging system. It was found by electron microscope observation that the reason for the increase of the strength of Ti alloy plus Zr alloy was that the addition of Zr alloy and Ti alloy significantly improved the stress corrosion resistance and the reduction of homogenization stress corrosion resistance, The alloy’s strengthening mechanism.