SU834182A1 - Alloy for modifying aluminium-silicon alloys - Google Patents

Description

The invention relates to the metallurgy of alloys, in particular to the modification of aluminum-based alloys used for the manufacture of a piston of internal combustion engines. Under production conditions, it is often impossible to achieve efficient and sustainable grinding of silicon inclusions in the microstructure of aluminum-silicon reciprocating hypereutectic alloys. The insufficient efficiency of modifying the structure of the alloys is due to the extremely short duration of the modifying effect of such an element of the modifier eutectically of silumin, which is phosphorus. Known additive for processing (aluminum-silicon alloys of the following composition fl, wt.%: Phosphorus15-29 Sulfur15-20 Hexachloroethane "Remaining When processing aluminum-silicon alloys, the effect of modification is not maintained when the alloys stand for a long time and completely disappears when they melt G27 / weight:%: Phosphorus 8.5-10 CopperOther The disadvantage of this alloy when it is used to modify hypereutectic aluminum-silicon alloys is the insufficient effect of modifying the primary silicon in the alloy structure, as well as that during the sizing of the liquid alloy and during its remelting, there is an enlargement of the particles of primary silicon, thus reducing the mechanical properties and deteriorating the performance of the parts. In addition, in the manufacture of hypereutectic aluminum-silicon alloys used, for example for the manufacture of pistons, in order to alloy these alloys with additives of copper, nickel and iron, it is necessary to introduce double ligatures into the melt. This significantly lengthens the duration of melting, which leads to a delay in equipment, an increase in energy consumption, reduced productivity. The closest to the proposed invention in composition is an alloy of the following composition (3, wt.%: Nickel 40-50 Iron 4-5 Phosphorus- Rest

The use of this alloy for the modification of the epithewtic apyunium-silicon alloys does not provide the necessary degree of grinding of the primary silicon crystals, which is associated with a low phosphorus content.

The effect of modification upon remelting is not preserved.

The purpose of the invention is the grinding of primary silicon crystals, the preserving effect of modification in ceramics and an increase in the temporary resistance to rupture and relative elongation of the alloys being processed.

The goal is achieved by the fact that the proposed ligature contains

components in the following ratio, wt.%:

40-50

4-5

4-5

Rest

Example. Investigated samples hypoeutectic aluminum-silicon piston alloy, modified proposed and known alloys.

The table shows the mechanical properties of samples from a reciprocating hypereutectic apyumine-silicon alloy and a particle size of primary silicon 5 in the structure of the alloy material.

Claims (3)

ij - tensile strength; d is the relative elongation. Claims Alloy for modifying aluminum of Euro-silicon alloys containing copper, nickel, iron, phosphorus, characterized in that, in order to crush crystals of primary silicon, preserve the effect of modification during remelting and increase temporary rupture strength and relative elongation of the alloys being processed, it contains components in the following ratio, weight,%: Nickel Iron Phosphorus Else Copper Sources of information, which are taken into account during the examination 1. Author's certificate of the USSR 19568, cl. C 22 C 21/04, 1972. 2. Questions of strength and plastic materials. 1972, p. 3. Japanese Patent No. 52-36847, 10 i. 15, 1977.