High-strength Al-Cr-SC alloy through 3D printing

Abstract

The invention discloses a high-strength Al-Cr-SC alloy through 3D printing. The metal powder for a high-strength aluminum-chromium alloy through 3D printing comprises the following components, by masspercentage, 2.5-10% of Cr, 0.5-2.5% of Mg, 0.1-0.9% of Sc, 0.2-0.7% of Zr, 0.1-0.3% of Si, 0.2-0.45% of Mn, 0.1-0.35% of Fe, 0.1-0.25% of Ti, 0.05-0.5% of AlCl3 powder, 0.05-0.3% of CaCl2 + NaCl andthe balance Al. The preparation method of the metal powder comprises the following steps that Al, Cr, Mg, Sc, Zr, Si, Mn, Fe, Ti pure metal block raw materials are weighed to be heated and melted, atomized for powder making, sieving and heat preservation for drying are conducted, AlCl3, CaCl2 and NaCl powder are added, and milling and mixing are conducted. According to the high-strength Al-Cr-SC alloy through 3D printing, the printed aluminum alloy part has no cracks and has high density, and the mechanical properties, wear resistance, corrosion resistance and high temperature and oxidation resistance are high.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing 3D printing material design, and in particular relates to a 3D printing high-strength Al-Cr-Sc alloy. Background technique [0002] In recent years, additive manufacturing (commonly known as 3D printing, two processes of special laser selective melting and laser melting deposition in this patent) aluminum alloy has been widely valued in aerospace, rail transit and other fields. This is because: First, the traditional processing methods of aluminum alloys are mainly casting, plastic processing and welding, and it is difficult to form components with high complex shapes. With the lightweight development of aerospace and rail transit, aluminum alloy parts with complex topological structures are difficult to process by traditional methods, and need to be processed by 3D printing technology; secondly, it is difficult to prepare ultra-fine Aluminum alloy with crystal structure, and 3D pr...

AI Technical Summary

Problems solved by technology

At present, 3D printing of traditional grades of aluminum alloys faces the following problems: (1) At present, only 4 series of cast AlSi alloys of traditional grades of aluminum alloys are suitable for 3D printing, and the formability is also good. Most of the 3D printing aluminum alloys are aluminum-silicon A series of alloys, but its mechanical properties are not high (tensile <400MPa, elongation <6.5%)

(2) 3D printing of traditional grades of aluminum alloys such as 2-7 series aluminum alloy gas atomized powder is prone to thermal cracks and poor mechanical properties

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