CN106048334B

CN106048334B - High-plastic High Strength Cast Aluminum Alloy of baric and cerium and preparation method thereof

Info

Publication number: CN106048334B
Application number: CN201610707962.XA
Authority: CN
Inventors: 张进; 郑江; 朱琳
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2016-08-23
Filing date: 2016-08-23
Publication date: 2018-01-09
Anticipated expiration: 2036-08-23
Also published as: CN106048334A

Abstract

The invention discloses high-plastic High Strength Cast Aluminum Alloy of a kind of baric and cerium and preparation method thereof, the percentage by weight of each component of alloy is Si 6.0% 12%, Ba 0.01% 2%, Ce 0.1% 1%, Mn 0.1% 0.6%, Ti 0.01% 0.04%, Mg 0.2% 0.4%, Fe is less than 0.2%, surplus Al.Ba addition can change the pattern of Si phases, and Si phases become fibrous or tiny graininess by lamellar, Eutectic Silicon in Al-Si Cast Alloys is evenly distributed in α (Al) matrix, play metamorphism, improve the plasticity of alloy.It the addition of Ce elements, can be combined with Al and Ba, form the tiny precipitated phase of Dispersed precipitate in the base, effective pinning dislocation, improve the intensity of alloy.

Description

High-plastic High Strength Cast Aluminum Alloy of baric and cerium and preparation method thereof

Technical field

The invention belongs to field of metallurgy, and in particular to the high-plastic High Strength Cast Aluminum Alloy of a kind of baric and cerium and its preparation side Method.

Background technology

With increasingly paying attention to resource rational utilization, the emphasis that energy resource consumption increasingly becomes research is reduced.Automobile Lightweight research is increasingly favored by researcher, and aluminium alloy will obtain in the automotive industry as using most light-alloys Widely application.In the structural member of automobile, increasing part is replaced with cast aluminium alloy gold.

With the development of auto industry, to the performance requirement also more and more higher, but existing frequently-used casting of cast aluminium alloy gold Aluminium alloy can not meet the requirement of the requirement of automobile technology performance, particularly plasticity, for automobile structure, D.Watson " Development of a super ductile diecast Al-Mg-Si alloy " sum up plasticity will Reach 15% requirement for just meeting automobile structure.Shouxun Ji et al. are in 2015 in " Materials Science＆ " the Development of a high strength Al-Mg delivered on Engineering A " periodicals₂Si-Mg-Zn Based alloy for high pressure die casting " propose Al-2.86wt%Mg-4.95wt%Si alloys Tensile strength 340MPa, yield strength 170MPa, but elongation percentage only has 6.9%.So finding suitable mode is keeping existing Have and the field that plasticity becomes cast aluminium alloy gold primary study is improved under conditions of intensity.

The content of the invention

In view of this, an object of the present invention is the high-plastic High Strength Cast Aluminum Alloy for providing baric and neodymium, passes through elder generation The experiment in stage, influenceing the factor of alloy plasticity has a lot, wherein important is exactly the pattern of Si phases in the base.Ba's The pattern of Si phases can be changed by adding, and Si phases become fibrous or tiny graininess by lamellar, make Eutectic Silicon in Al-Si Cast Alloys uniform It is distributed in α (Al) matrix, plays metamorphism, improve the plasticity of alloy.The addition of Ce elements, it can be combined with Al and Ba, The tiny precipitated phase of Dispersed precipitate is formed in the base, their effective pinning dislocations, improves the intensity of alloy.The present invention's The second purpose is the preparation method for providing the aluminium alloy.

Specific technical scheme of the invention is as follows：

1st, the high-plastic High Strength Cast Aluminum Alloy of baric and cerium, each component are Si 6.0%-12%, Ba by weight percentage 0.01%-2%, Ce 0.1%-1%, Mn 0.1%-0.6%, Ti 0.01%-0.04%, Mg 0.2%-0.4%, Fe are less than 0.2%, surplus Al.

Preferably, each component percentage Si 6.2%, Ba 0.01%, Ce 0.15%, Mn 0.13%, Ti 0.014%, Mg 0.26%, Fe 0.18%, surplus Al.

Preferably, each component percentage is Si 8.4%, Ba 0.10%, Ce 0.34%, Mn 0.39%, Ti 0.023%, Mg 0.31%, Fe 0.15%, surplus Al.

Preferably, each component percentage is Si 10.5%, Ba 1.10%, Ce 0.57%, Mn 0.46%, Ti 0.031%, Mg 0.34%, Fe 0.16%, surplus Al.

Preferably, each component percentage is Si 11.8%, Ba 1.9%, Ce 0.95%, Mn 0.54%, Ti 0.040%, Mg 0.39%, Fe 0.19%, surplus Al.

2nd, the preparation method of the high-plastic High Strength Cast Aluminum Alloy of baric and cerium：Commercial-purity aluminium is heated to 720~730 DEG C, Al-Si intermediate alloys and Al-Mn intermediate alloys are added, then proceedes to add Al-Ce intermediate alloys after being heated to 750 DEG C, with And Al-Ti intermediate alloys, then it is incubated and stirs, treats that alloy cools to 720 DEG C, add pure barium.Mixed after being completely dissolved and smart Refining 30 minutes, is finally passed through argon gas degasification 15 minutes, and equitemperature is stable to be poured into a mould at 720 DEG C.

The beneficial effects of the present invention are：

Ba addition can change the pattern of Si phases, and Si phases become fibrous or tiny graininess by lamellar, made Eutectic Silicon in Al-Si Cast Alloys is evenly distributed in α (Al) matrix, is played metamorphism, is improved the plasticity of alloy.The addition of Ce elements, Ke Yiyu Al and Ba is combined, and is formed the tiny precipitated phase of Dispersed precipitate in the base, their effective pinning dislocations, is put forward the intensity of alloy It is high.

Because the processability of alloy is good, yield strength can reach 150-180MPa in the case of as cast condition, and tension is strong Degree can reach 270MPa-350MPa, and plasticity can reach 4-8%.Through Overheating Treatment (T6), mechanical property yield strength can be with Reach 180-300MPa, tensile strength can reach 260MPa-350MPa, and plasticity can reach 7-16%.

Brief description of the drawings

In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below：

Fig. 1 is the metallograph of alloy described in embodiment 1；

Fig. 2 is the metallograph of alloy described in embodiment 2；

Fig. 3 is the metallograph of alloy described in embodiment 3；

Fig. 4 is the metallograph of alloy described in embodiment 4.

Embodiment

The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing.Unreceipted specific bar in embodiment The experimental method of part, generally according to normal condition or according to the condition proposed by manufacturer.

Alloy preparation method is as follows：Commercial-purity aluminium is heated to 720~730 DEG C, adds Al-Si intermediate alloys and Al- Mn intermediate alloys, then proceed to add Al-Ce intermediate alloys after being heated to 750 DEG C, and Al-Ti intermediate alloys, then it is incubated And stir, treat that alloy cools to 720 DEG C, add pure barium.Mix and refine 30 minutes after being completely dissolved, be finally passed through argon gas degasification 15 minutes, equitemperature is stable to be poured into a mould at 720 DEG C.

Each embodiment alloying component is as shown in the table, and component content is represented with percentage by weight, surplus Al.

Alloy	Si	Ba	Ce	Mn	Ti	Mg	Fe
								Embodiment 1	6.2%	0.01%	0.15%	0.13%	0.014%	0.26%	0.18%
Embodiment 2	8.4%	0.10%	0.34%	0.39%	0.023%	0.31%	0.15%
								Embodiment 3	10.5%	1.10%	0.46%	0.46%	0.031%	0.34%	0.16%
Embodiment 4	11.8%	1.90%	0.95%	0.54%	0.040%	0.39%	0.19%
								Al-2.86wt%Mg-4.95wt%Si	4.95%	—	—	6.82%	—	2.86%	6.92%

Al-2.86wt%Mg-4.95wt%Si alloys, room temperature tensile intensity are 340MPa, yield strength 170MPa, are prolonged Rate is stretched for 6.9%.

The metallograph of embodiment 1 is as shown in figure 1, room temperature tensile intensity is 274MPa, yield strength 153MPa, and elongation percentage is 3.8%, after heat treatment (T6), tensile strength of mechanical property can reach 263MPa, and yield strength can reach 187MPa, plasticity 7.1% can be reached.

The metallograph of embodiment 2 is as shown in Fig. 2 room temperature tensile intensity is 294MPa, yield strength 185MPa, and elongation percentage is 4.3%, after heat treatment (T6), tensile strength of mechanical property can reach 294MPa, and yield strength can reach 215MPa, plasticity 12.8% can be reached.

As shown in figure, room temperature tensile intensity is 343MPa to the metallograph of embodiment 3, yield strength 175MPa, elongation percentage For 7.7%, after heat treatment (T6), tensile strength of mechanical property can reach 345MPa, and yield strength can reach 305MPa, modeling Property can reach 15.3%.

The phasor of embodiment 4 is as shown in figure 4, room temperature tensile intensity is 265MPa, yield strength 152MPa, and elongation percentage is 4.2%, after heat treatment (T6), tensile strength of mechanical property can reach 260MPa, and yield strength can reach 165MPa, plasticity 8.5% can be reached.

Alloy prepared by the present invention, plasticity and intensity is more unmetamorphosed is obviously improved, this is due to alloying element Ba addition can change the pattern of Si phases, and Si phases become fibrous or tiny graininess by lamellar, make Eutectic Silicon in Al-Si Cast Alloys equal Even is distributed in α (Al) matrix, plays metamorphism, improves the plasticity of alloy.The addition of Ce elements, it can be tied with Al and Ba Close, form the tiny precipitated phase of Dispersed precipitate in the base, their effective pinning dislocations, improve the intensity of alloy.

Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be Various changes are made to it in form and in details, without departing from claims of the present invention limited range.

Claims

1. the high-plastic High Strength Cast Aluminum Alloy of baric and cerium, it is characterised in that each component percentage by weight Si 6.0%-12%, Ba 0.01%-2%, Ce 0.1%-1%, Mn 0.1%-0.6%, Ti 0.01%-0.04%, Mg 0.2%-0.4%, Fe are less than 0.2%, surplus For Al.

2. the high-plastic High Strength Cast Aluminum Alloy of baric according to claim 1 and cerium, it is characterised in that each component weight hundred It is Si 6.2% to divide ratio, Ba 0.01%, Ce 0.15%, Mn 0.13%, Ti 0.014%, Mg 0.26%, Fe 0.18%, and surplus is Al。

3. the high-plastic High Strength Cast Aluminum Alloy of baric according to claim 1 and cerium, it is characterised in that each component weight hundred It is Si 8.4% to divide ratio, Ba 0.1%, Ce 0.34%, Mn 0.39%, Ti 0.023%, Mg 0.31%, Fe 0.15%, surplus Al.

4. the high-plastic High Strength Cast Aluminum Alloy of baric according to claim 1 and cerium, it is characterised in that each component weight hundred It is Si 10.5% to divide ratio, Ba 1.1%, Ce 0.57%, Mn 0.46%, Ti 0.031%, Mg 0.34%, Fe 0.16%, and surplus is Al。

5. the high-plastic High Strength Cast Aluminum Alloy of baric according to claim 1 and cerium, it is characterised in that each component weight hundred It is Si 11.8% to divide ratio, Ba 1.9%, Ce 0.95%, Mn 0.54%, Ti 0.040%, Mg 0.39%, Fe 0.19%, and surplus is Al。