Al-Cu-Mg-Ag powdered metallurgical heat-resisting aluminum alloy and preparation method thereof

Abstract

The invention discloses an Al-Cu-Mg-Ag powdered metallurgical heat-resisting aluminum alloy and a preparation method thereof. The alloy comprises the components in percentage by weight: 4 to10 percent of Cu, 0.8 to 2.0 percent of Mg, 0.4 to 2.0 percent of Ag, 0 to 1.0 percent of Mn, 0 to 1.0 percent of Zr, 0 to 1.0 percent of Ti and the balance of Al. By adopting an element powder method, and ball milling, blank pressing, vacuum hot pressed sintering, and solid solution and aging methods, the powdered metallurgical heat-resisting aluminum alloy with fine grains is obtained; and the performance of the alloy is obviously better than that of the conventional cast Al-Cu-Mg-Ag heat-resisting aluminum alloy, and requirement of middle and high temperature structural materials on the heat-resisting aluminum alloy can be met; and industrial application can be realized, and application of the aluminum alloy in the field of the middle and high temperature structural materials is expanded.

Description

technical field

[0001] The invention relates to an aluminum-copper-magnesium-silver powder metallurgy heat-resistant aluminum alloy and a preparation method thereof. The invention belongs to the technical field of high-performance medium-temperature structural metal materials and powder metallurgy. . Background technique

[0002] Aluminum-copper cast aluminum alloy is a heat-treatable and strengthened aluminum alloy, which is used as a medium-temperature structural material due to its good age hardening ability and thermal stability. Typical materials of this type include ZL201 in my country and 242.0 in the United States. The main chemical composition and weight percentage of ZL201 cast aluminum alloy are: Cu4.5-5.3%, Mn 0.6-1.0%, Ti 0.15-0.35%, the rest is Al, and its room temperature tensile strength σ b 363MPa, σ at 300°C b It is 118MPa; the main chemical composition and weight percentage of 242.0 cast aluminum alloy are: Cu 3.5-4.5%, Mg 1.2-1.8%, Ni 1.7-2.3%, the re...