High-strength aluminum alloy for fastener and processing technology of high-strength aluminum alloy

• Main Authors: LI JUNZHENG, WU TENGFENG, LIU YAQING
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2020
• 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; WORKING OR PROCESSING OF METAL WIRE

The invention discloses a high-strength aluminum alloy for a fastener and a processing technology of the high-strength aluminum alloy. According to the technical scheme, the high-strength aluminum alloy is characterized by comprising the following elements in percentages by mass: 4.5-9.5wt.% of Zn, 1.5-6wt.% of Mg, 1.2-3.5wt.% of Mn, 1.0-3wt.% of Cu, 0.01-1.0wt.% of Sc, 0.05-1.0% of Ti, 0.02-0.1%of B, 0.01-0.5% of Li, 0.05-1wt.% of Yb, 0.01-1wt.% of Tb, 0.05-1.0wt.% of Zr and the balance of Al. According to the homogenizing annealing treatment technology before wire cold heading, the materialdoes not crack after being subjected to cold upsetting by 75%, and the tensile strength of a cold heading product after solution aging treatment can reach 600 MPa or above. 本发明公开了一种紧固件用高强度铝合金及其加工工艺，其技术方案要点是包括以下质量百分比的元素：合金由Al、Zn、Mg、Mn、Cu、Sc、Ti、B、Li、Yb、Tb、Zr等组成，合金组分的质量为4.5～9.5wt.%的Zn，1.5～6wt.%的Mg，1.2～3.5wt.%的Mn，1.0～3wt.%的Cu，0.01～1.0wt.%的Sc，0.05～1.0%的Ti，0.02～0.1％的B，0.01～0.5％的Li，0.05～1wt.%的Yb，0.01～1wt.%的Tb，0.05～1.0wt.%的Zr，余量为