Cr-containing creep-resisting extruded zinc alloy and preparation method thereof

Abstract

The invention discloses a Cr-containing creep-resisting extruded zinc alloy, belonging to the technical field of metal material manufacture. The alloy comprises the following components by mass percent: 0.05-3.0% of Cr, 0.5-2.5% of Cu, 0.1-0.3% of Ti and the balance of Zn and impurities which accounts for no more than 0.05% of the total amount. The alloy also can comprise 0.1-1.0% of Al by mass. The preparation method is implemented as follows: smelting by adopting a coverage protective method at the temperature of 630-720 DEG C, adding the alloy elements respectively in a form of pure Zn, pure Al and intermediate alloys of Cu-Cr, Zn-Cu and Zn-Ti, casting at the temperature of 450-500 DEG C after the alloy solution is mixed evenly, homogenizing ingots for 6-10h at the temperature of 360-380 DEG C, performing extrusion forming at the temperature of 240-320 DEG C with the extrusion ratio of 15-38, and annealing for 1-3h at the temperature of 180-220 DEG C. The invention has reasonable component proportioning, and the prepared zinc alloy is a deformation zinc alloy suitable for extrusion and has excellent creep resistance and combination properties.

Description

technical field [0001] The invention discloses a zinc alloy and a preparation method thereof, in particular to a Cr-containing anti-creep extrusion zinc alloy and a preparation method thereof; belonging to the technical field of metal alloy material manufacture. Background technique [0002] Low creep resistance is one of the main bottlenecks limiting the popularization and application of wrought zinc alloys. In order to improve the creep resistance of zinc alloys, some foreign researchers have conducted some research on the deformation mechanism, alloying and process conditions of zinc alloys. Wrought zinc alloy until the 1960s, due to the progress of smelting and processing technology, the research work on improving the physical properties and comprehensive properties of zinc alloy has been accelerated, especially the mastery of high-strength creep-resistant zinc alloy melting technology and processing technology, It breaks the limitation that zinc alloy cannot be used as...

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Problems solved by technology

[0003] Domestic research on zinc-copper alloys is almost blank. Since the late 1990s, Guangzhou Institute of Metallurgy and Central South University have conducted preliminary research on zinc-copper alloys, but the research content is narrow and the research is not systematic and in-depth.

In 1999, Guangdong Metallurgical Research Institute trial-produced several grades of zinc-copper-titanium alloy products for the continuous casting and rolling production line of Guangzhou Zinc Sheet Factory. The creep resistance performance has been improved, but not significant enough.

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