Continuous temperature gradient annealing method for improving hardness of 5xxx aluminum alloy

• Main Authors: YANG HONGFU, LI MENGNIE, WU YARU, HUANG RENSONG, YANG WENHAO, LU SHUMENG, ZHENG SHANJU
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2023
• Subjects: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a continuous temperature gradient annealing method for improving the hardness of a 5xxx aluminum alloy, and belongs to the technical field of aluminum alloy heat treatment. The method comprises the following steps: uniformly heating a 5xxx aluminum alloy to 350-400 DEG C at a heating rate of 1.6-3.3 DEG C/min, and carrying out continuous temperature gradient annealing; and the 5xxx aluminum alloy subjected to continuous temperature gradient annealing is cooled to the room temperature at the constant speed of 5-15 DEG C/min. According to the heat treatment method, the hardness of the 5xxx aluminum alloy is improved through solid solution strengthening of the 5xxx aluminum alloy and increase of dislocation density of part of crystal faces, and compared with isothermal annealing and homogenizing annealing adopted in an existing heat treatment method, the hardness of the 5xxx aluminum alloy can be improved through a simpler technological process within a short time, and the service life o