US 12,110,575 B2
High strength and toughness die-casting aluminum alloy without heat treatment, preparation method and article thereof
Hua Huang, Zhaoqing (CN); Yu Zhu, Zhaoqing (CN); Feng Yan, Zhaoqing (CN); Yun Lin, Zhaoqing (CN); and Li Wan, Zhaoqing (CN)
Assigned to GUANGDONG HONGTU AUTO PARTS CO., LTD, Guangzhou (CN); and GUANGDONG HONGTU TECHNOLOGY (HOLDINGS) CO., LTD, Zhaoqing (CN)
Filed by GUANGDONG HONGTU AUTO PARTS CO., LTD, Guangzhou (CN); and GUANGDONG HONGTU TECHNOLOGY (HOLDINGS) CO., LTD, Zhaoqing (CN)
Filed on Aug. 15, 2023, as Appl. No. 18/233,911.
Claims priority of application No. 202310223358.X (CN), filed on Mar. 9, 2023.
Prior Publication US 2024/0301535 A1, Sep. 12, 2024
Int. Cl. C22C 21/02 (2006.01); B22D 17/00 (2006.01); B22D 21/00 (2006.01); C22C 1/02 (2006.01)
CPC C22C 21/02 (2013.01) [B22D 17/00 (2013.01); B22D 21/007 (2013.01); C22C 1/026 (2013.01)] 20 Claims
 
1. A die-casting aluminum alloy having copper and zinc elements without a heat treatment, comprising the following components in percentage by mass: 7.0 wt. %-10.0 wt. % of silicon, no more than 0.05 wt. % of copper, no more than 0.006 wt. % of magnesium, 0.3 wt. %-0.7 wt. % of manganese, 0.1 wt. %-0.2 wt. % of iron, no more than 0.07 wt. % of zinc, 0.03 wt. %-0.2 wt. % of titanium, 0.015 wt. %-0.03 wt. % of strontium, 0.02 wt. %-0.05 wt. % of vanadium, 0.01 wt. %-0.05 wt. % of zirconium, no more than 0.05 wt. % of each of unavoidable impurity elements; wherein a sum of the unavoidable impurity elements is no more than 0.25 wt. %, and a rest is aluminum; and
a ratio of the percentage by mass of the vanadium to the percentage by mass of the zirconium is 1.2:1 to 2.4:1, wherein an as-cast tensile strength of the die-casting aluminum alloy is in a range between 270 MPa and 300 MPa, an as-cast yield strength of the die-casting aluminum alloy is in a range between 120 MPa and 150 MPa, and an as-cast elongation of the die-casting aluminum alloy is in a range between 11% and 16%.