Erbium-containing ultrahigh-strength corrosion-resistant aluminum alloy thick-wall pipe and preparation process thereof

• Main Authors: WU XIWEI, YE YANG, RAO MAO, GENG LIBO, ZHOU HUA, MAO XUEJING, GU YUTING
• Format: Patent
• Language: Chinese; English
• Published: 29.03.2024
• Subjects: ALLOYS; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides an erbium-containing Al-Zn-Mg-Cu series aluminum alloy pipe, which is prepared from the following components in percentage by mass: 0.8 to 1.2 percent of Cu, 2.2 to 2.6 percent of Mg, 7.4 to 8.4 percent of Zn, 0.2 to 0.5 percent of Mn, 0.05 to 0.15 percent of Zr, 0.02 to 0.20 percent of Er and the balance of Al. Through multiple means of composite microalloying, deformation, heat treatment strengthening and the like, precipitation and distribution of a nanoscale high-thermal-stability dispersion strengthening phase in the alloy are controlled, the strengthening phase density in the alloy is improved, the alloy strengthening phase stably exists, the strength and corrosion resistance of the alloy are improved, and the alloy can be used as a marine aluminum alloy material. By utilizing the synergistic effect of all the elements, the corrosion resistance of the alloy is remarkably improved under the condition that the mechanical property of the alloy is not reduced, the anti-exfoliation cor