The influence of hydrides on the quality of aluminum materials

In casting, the increase of hydrogen content in aluminum alloy will form loose pores, small white spots and small tails in the casting. These defects will increase the content of hydrogen, and the air tightness of the casting will be reduced

In terms of heat treatment performance, the lightness in the casting is a reason for the secondary looseness of the casting during the homogenization process, and this lightness can also cause blistering on the surface of the casting

During the pressure processing process, the delamination defects of aluminum alloys will increase in direct proportion to the increase of hydrogen content.

The peeling and blistering of the aluminum plate surface and the bright scales in the forged aluminum forgings are caused by hydrogen. This hydrogen is not the only one that comes from aluminum ingots. Recently, some hydrogen embrittlement has been found in aluminum alloys. As the hydrogen content increases, the brittle temperature range will be larger, and the transverse cross-section shrinkage will be very small, making the aluminum alloy more brittle during forging and rolling.

The influence of hydrides on the surface state. Hydrogen in aluminum alloys will promote the formation of turbid pits during electrolytic polishing and deteriorate the surface condition after turning.

Hydride also has an impact on mechanical properties. With the increase of hydrogen content, the strength, plasticity, impact toughness, and fracture toughness of aluminum ingots will be greatly reduced.