CAST COMPOSITE MATERIAL OF AL ALLOY BASE AND METHOD OF ITS MANUFACTURING Russian patent published in 2015 - IPC C22C1/03 C22C1/10 B82B1/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to manufacturing of the cast composite material (CCM) based of Al alloy to manufacture cyclic and thermal loaded to 230°C aviation parts - blades of fans and LP compressor stages of advanced aviation engines and gas transfer units. The cast composite material based on Al alloy of Al-Cu-Mg-Ag system contains reinforcing discrete ceramic parts of Al oxide with grain size 10-100 nm in amount 0.2-10 % by volume and Ti diboride with grain size 0.5-1.5 micron in amount when Ti content in alloy is 0.1-0.2 wt %. Method of CCM manufacturing includes manufacturing of modified Al-Ti-B foundry alloy by means of dry mechanical and friction treatment in grinding and mixing device of the coarse powder or shaving of Al-Ti-B foundry alloy selected from row AlTi₃B₁, AlTi₅B_0.2, AlTi₅B_0.6, AlTi₅B₁, injection of the specified quantity of the discrete ceramic particles of Al oxide with grain size 10-100 nm, mixing until reception of the uniform consistency, further high energy machining of the received mixture, its briquetting using the cold isostatic pressing under pressure 200-400 MPa to achieve density exceeding 60% of the theoretical density, the received brickets supply to the melted Al alloy of Al-Cu-Mg-Ag system overheated to 750-850°C, holding at specified temperature for 20-60 minutes, pouring with solidification rate at least 70 K/s, and final heat treatment by homogenising annealing at 450-500°C for 2-24 hours, heating to 510-520°C with holding for 1-5 hours, water quenching and further artificial ageing at 190-250°C for 2-10 hours.

EFFECT: increased high temperature strength and crack strength of CCM due to uniform distribution of nm size ceramic particles of Al oxide in the casting volume.

2 cl