CN106756151A

CN106756151A - A kind of method of the rotten AlSiCu alloys of rare earth Er

Info

Publication number: CN106756151A
Application number: CN201611166374.6A
Authority: CN
Inventors: 张松利; 张炳荣; 张冬梅; 汪闵; 陈宝和
Original assignee: Zhenjiang Powerise Special Alloy Technology Development Co Ltd
Current assignee: Zhenjiang Powerise Special Alloy Technology Development Co Ltd
Priority date: 2016-12-16
Filing date: 2016-12-16
Publication date: 2017-05-31

Abstract

A kind of method of the rotten AlSiCu alloys of rare earth Er, belongs to aluminium alloy casting technology field.After melting, addition refining agent carries out refining degasification to alusil alloy, is subsequently added rare earth element, insulation is stood at a temperature of 780 DEG C, at a certain temperature castable.Rare earth element has good metamorphism, and its deterioration latency stage short, rotten effective time is long.Additionally, also there is dehydrogenation degasification to aluminium alloy, the effect of oxide inclusion is reduced, improve the tissue of alloy, lift its mechanical property.

Description

A kind of method of the rotten AlSiCu alloys of rare earth Er

Technical field

The invention belongs to aluminium alloy casting technology field, more particularly to AlSiCu alloy modifications processing method.

Background technology

The density of hypoeutectic al-si alloy is low, good casting property, high mechanical properties, can cast the high intensity casting of complicated shape Part, it is widely used in industries such as automobile, Aero-Space.For unmetamorphosed Al-Si alloys, eutectic silicon is in thick Sheet or block structure, and it is relatively more crisp, cause the crackle of stress concentration, early stage easily to be produced herein at the tip of phase and edges and corners Raw, mechanical property particularly plasticity is significantly reduced.

Rotten main for hypoeutectic Al-Si alloy has Na is rotten, Sr is rotten, Sb is rotten etc..At present, industrial production mistake All can carry out Metamorphism treatment to alusil alloy to change Morphology of Eutectic Silicon in Al-Si Foundry Alloys in journey, fiber is changed into by thick sheet or needle-like Shape, improves the mechanical property of alloy, especially elongation percentage, while the Shrinkage behavior for becoming confrontation Al-Si alloys also has strong suppression Make and use, the most frequently used alterant is Sr intermediate alloys and Na salt in industry.Na salt is due to easily failing and being difficult to control gradually Replaced by Sr, but result of study shows, addition also the increasing along with defects such as stomatas of Sr alterants, also easily produces Low-alloyed performance, drops in denaturalization phenomenon.Sb is rotten to be had the advantages that not fail, deaerates, but modification effect is general, and the corresponding time Slowly.

The content of the invention

The invention provides a kind of method of the rotten AlSiCu alloys of rare earth Er, obtain that there is good tensile strength and prolonged The alloy of rate is stretched, solves the problems, such as there is gas hole defect in the alloy obtained using alterant.

A kind of new method of rotten AlSiCu alloys, mainly includes that intermediate alloy is added, stands the steps such as insulation, cast, It is characterized in that alusil alloy is after melting, addition refining agent carries out refining degasification, Er elements is subsequently added, in 780 DEG C of temperature Lower standing is incubated, at a certain temperature castable.

Element is added with Al-Er alloy forms, weight/mass percentage composition control of the Er elements in alloy molten solution 0.05% ~ 0.4wt.%, preferably 0.1wt%, modification effect now are optimal.

After Er elements are added with Al-20Er alloys, insulation 10min is stood at a temperature of 780 DEG C, modification effect now is most It is good.After adding Al-20Er alloys, the castable at a temperature of 720 DEG C, modification effect now is optimal.

Concrete technical scheme of the present invention is as follows：

1. dispensing is carried out by the composition of AlSiCu alloys；

2. the raw material of the hypoeutectic al-si alloy that will be prepared such as includes that rafifinal, alusil alloy, high purity copper, alumal are put into After being dried in drying box, be subsequently placed into graphite crucible, in the resistance furnace by alloy melting after, be heated to 780 DEG C；

3. with the graphite bell jar for being preheated to 300 DEG C, inside the alloy molten solution that will be obtained in aluminium foil parcel refining agent press-in step 2, Refining agent is carbon trichloride, and addition is the 0.5wt% of alloy molten solution quality, removes the residue on surface after 30s with spoon of skimming；

4., to Er elements are added in step 3 alloy molten solution, it is sufficiently stirred for, weight/mass percentage composition control of the Er elements in alloy molten solution System is in 0.05% ~ 0.4wt.%, preferably 0.1wt%；

5. after step 4 alloy molten solution carries out insulation stewing process at a certain temperature, it is poured into uniform temperature pre- in advance Heat is in 300 DEG C of metal type dies；

Intermediate alloy used by the present invention is alloys in common use.

After adding Er elements in AlSiCu alloys, appropriate addition changes the pattern and size of eutectic silicon, silicon phase Tiny graininess is changed into from thick lamellar, apparent modification effect is produced.In process of setting, when liquation reaches altogether During brilliant reflecting point, there is eutectic forming core.Used as leading phase, its solid liquid interface forward position has many interface steps to silicon, and silicon is former Son is piled up on these steps and is grown up, and after addition element, element is adsorbed on silicon atom growth step, due to Er atomic radiuses Si atoms are far longer than, the atom packing order and the direction of growth in silicon phase solid matter face are changed, so as to produce modification effect.Becoming The cooldown rate of liquation plays certain influence in matter, therefore selects copper mould casting during cast.

Rare earth element has good metamorphism, and its deterioration latency stage short, rotten effective time is long.Additionally, being closed to aluminium Gold also has dehydrogenation degasification, reduces the effect of oxide inclusion, improves the tissue of alloy, lifts its mechanical property.

Brief description of the drawings

Fig. 1 is the as-cast structure scanning electron microscope (SEM) photograph of unmetamorphosed AlSi7Cu2 alloys.

Fig. 2 is the as-cast structure scanning electron microscope (SEM) photograph of the AlSi7Cu2 alloys after fully going bad.

Specific embodiment

Technical solution of the present invention is not limited to act specific embodiment set forth below, also including between each specific embodiment Any combination.

Specific embodiment 1：

1. during dispensing is carried out to AlSi7Cu2 gold, after preparing alusil alloy, high purity copper, alumal and pure magnesium, Si Mass ratio is 7wt.% to element in the alloy, and mass ratio is 2wt.% to Cu elements in the alloy, and mass ratio is Mg elements in the alloy Mass ratio is 0.2wt.% to 0.4wt.%, Mn element in the alloy；

2. 780 DEG C are heated to by after fine aluminium and all alloy meltings in the resistance furnace；

3. refined with carbon trichloride, skimmed；

4. at 780 DEG C, the Al-20Er alloys that prior aluminium foil is wrapped up are added in solution, and 10 minutes are incubated after stirring, Er units Weight/mass percentage composition of the element in alloy molten solution is controlled in 0.05% ~ 0.4wt.%, preferably 0.1wt%；

5. at 720 DEG C, the Mg that will be wrapped up with aluminium foil in advance is added in solution, and 3 minutes are incubated after stirring, is then poured into advance It is preheated among 300 DEG C of copper mold.

Case study on implementation 2：

It is that mass ratio is 9wt.% to Si elements in the alloy with 1 difference is implemented, mass ratio is Cu elements in the alloy 1wt.%, Mg element in the alloy mass ratio be 0.3wt.%, Mn elements in the alloy mass ratio be 0.4wt.%, add Er after Isothermal holding 10min between 780 DEG C, is poured into after addition Mg isothermal holdings and is preheated in 300 DEG C of copper mold.With this understanding may be used Reach modification effect same as Example 1.

Claims

1. a kind of method of the rotten AlSiCu alloys of rare earth Er, mainly includes that intermediate alloy is added, stands insulation, cast step, It is characterized in that AlSiCu alloys are after melting, addition refining agent carries out refining degasification, Er elements is subsequently added, in 780 DEG C of temperature Degree is lower to stand insulation, the castable at 720 DEG C.

2. described in claim 1 characterized in that, Er elements with Al-20Er alloy forms add, Er elements are in alloy molten solution Weight/mass percentage composition control in 0.05% ~ 0.4wt.%.

3. according to the method for claim 2, it is characterised in that weight/mass percentage composition control of the Er elements in alloy molten solution exists 0.1wt.%。

4. according to the method for claim 1, it is characterised in that after Er elements are added with Al-20Er alloys, at a temperature of 780 DEG C Stand insulation 10min.

5. according to the method for claim 1, it is characterised in that the castable at a temperature of 720 DEG C.

6. according to the method for claim 1, it is characterised in that addition refining agent carries out refining degasification and is：With being preheated to 300 DEG C Graphite bell jar, inside the refining agent press-in alloy molten solution that aluminium foil is wrapped up, refining agent is carbon trichloride, and addition is alloy molten solution The 0.5wt% of quality, removes the residue on surface with spoon of skimming after 30s.

7. the rotten AlSiCu alloys for being prepared according to the method described in claim any one of 1-6.