JPS61227146A - Aluminum alloy for high pressure casting having superior strength - Google Patents

Abstract

PURPOSE:To eliminate defects caused by segregation, blowholes, inclusions, etc., in high pressure casting and to give superior strength by providing an Al alloy containing specific amounts of Si, Cu, Mn and Mg as principal components. CONSTITUTION:The alloy has a composition consisting of 0.2-1.0% Si, 1-5% Cu, 0.3-1.2% Mn, 0.3-2.0% Mg, and the balance Al with impurities, to which 0.005-0.2% Ti and 0.0005-0.05% B are incorporated, if necessary. The Al alloy is subjected to high pressure casting under a pressure of about 300-3,000kg/cm<2>. This cast Al alloy excels in strength, toughness, isotropy of mechanical properties, etc., so that it can be used for automobile parts and electronic machine-relating parts.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an aluminum alloy for high-pressure casting, and more particularly to an aluminum alloy for high-pressure casting having strength and toughness.

Conventional technology Conventionally, automobile parts such as automobile wheels, VTR cylinders, spindle pulp, actuators,
Supports and other parts of external storage devices are often made of aluminum alloy castings and aluminum, which have many defects and are unreliable in terms of strength.If they are used as electronic components, for example, images on a VTR may be distorted, or the storage device may be damaged. There are problems such as interfering with the operation of the

Tomo Forged Material has miscellaneous beans called Conut Ryo.

Problems to be Solved by the Invention The present invention solves the above-mentioned conventional problems, and has no defects due to segregation, cavities, inclusions, etc., and has strength, toughness, and wear resistance.

Means for Solving the Problem] The invention is based on Si0.2 to 1.0% v Cu 1 to 5%
.

Aluminum alloy for high-pressure casting containing 0.3-1.2% Mn, 0.3-2.0% Mg, and the balance consisting of AI and impurities Si0.2-1-0%tCu 1-0%
5%.

Mn0.3-1.2%, Mg0.3-2.0%, Ti
0.00.5~0.2%, 80.002~0.05%
The gist of this invention is an aluminum alloy for high-pressure casting with excellent strength, consisting of residual aluminum and impurities.

The preferred composition is Si0.85-1.0%, Cu8
, 5-4.5%e Mn 0.4-1.0%, Fil1
g0.45-1.0. Ti0.01-0.15%, B0
．． 001 to 0.005, the balance being aluminum and impurities, the aluminum alloy has excellent strength and is for high pressure casting as claimed in claim 2.

The reason for the composition limit for electrical equipment for added elements will be explained below.

Si: A component that coexists with Mg and helps improve strength.
If it is less than 0.296, the effect will be small, and if it exceeds 1.0%, it will elongate and reduce toughness. It is preferable to add it in a range of 0.3 to 0.80%.

Mg: Coexists with Si and helps improve strength, but if it is less than 0.3%, the effect is small, and if it exceeds 1.2%, it will elongate and reduce the toughness completely. It is preferable to add it in a range of 0.3 to 1.2%.

Cu: Coexists with Mg and helps improve strength. If it is less than 1%, the effect will be small, and if it exceeds 5%, elongation and toughness will decrease, which is not preferable.

Mn: Ifit has the effect of improving corrosion resistance, stress corrosion resistance, and toughness, but if it exceeds 1.2%, elongation and toughness decrease, and if it is 0.8% or less, the effect of improving frame strength is small.

T i e B: T i coexists with borrowed B to refine the casting structure. This helps prevent macroscopic analysis, which is a drawback of high-pressure solidification casting. 0.005q6 and 0.0 respectively
If it is less than 0.02%, the effect is small, and if it exceeds 0.2% and 0.05%, large inclusions 'I' i B
! This causes the occurrence of eight-dot spots, etc., and reduces toughness and elongation. Especially TieB's:
0.01 to 0.15 when coexisting. B0.001~0
．． More preferably, it is added in a range of 0.005%. Addition of Ti alone has the drawback of increasing Tifi and forming intermetallic compounds when the amount reaches 0.5%. Regarding the manufacturing process, this alloy eliminates casting defects when cast under high pressure and achieves the desired performance. The pressurizing conditions are aOO~
3000&lF/14 is preferred.

If this pressure crab 9 is low, shrinkage cavities and cracks are likely to occur.

Furthermore, even if the pressure is increased beyond this limit, it is possible to perform aging treatment and other tempering treatments depending on the purpose of removing cavities and cracks.

Example: The aluminum alloy shown in the table below was high-pressure cast into a mold at a pressure of 1000 x 9/d to obtain a cod bar with a length of 100φ x 200. JIS No. 4 tensile test pieces were cut from this bar and subjected to a tensile test after heat treatment. The invented alloy cast under high pressure showed no defects such as cavities or cracks. On the other hand, if the alloy for rod 1 is cast in a mold under atmospheric pressure, the result of T4 treatment is σ0.224.1F/-σB86゜8kg/-65
% and 几.

When I inspected the cross section, I found that there were cavities and cracks.

This is thought to be the cause of the deterioration in ductility.

As described above, the high-pressure casting alloy of this invention has no defects such as segregation or cavities and has excellent strength and toughness, and is suitable for automobile parts,
Suitable for electronic related parts.

Claims (2)

[Claims] (1) Si0.2-1.0%, Cu1-5%, Mn0.
An aluminum alloy for high-pressure casting with excellent strength, containing 3% to 1.2% Mg, 0.3% to 2.0% Mg, and the balance consisting of aluminum and impurities. (2) Si0.2-1.0%, Cu1-5%, Mn0.
3-1.2%, Mg0.3-2.0%, Ti0.005
An aluminum alloy for high-pressure casting with excellent strength, containing ~0.2%, B0.0002~0.05%, and the balance consisting of aluminum and impurities.