CN108315604A

CN108315604A - A kind of Al-Yb-Zr alloys of the low Sc contents of reinforcing

Info

Publication number: CN108315604A
Application number: CN201810135589.4A
Authority: CN
Inventors: 高坤元; 王兴; 丁宇升; 黄晖; 文胜平; 吴晓蓝
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2018-02-09
Filing date: 2018-02-09
Publication date: 2018-07-24

Abstract

A kind of Al Yb Zr alloys of the low Sc contents of reinforcing, belong to technical field of alloy.Alloy is that 0 0.101wt.%Sc, 0.052 0.086wt.%Yb, 0.161 0.21wt.%Zr are added in aluminum substrate.The method that the present invention passes through Sc, Zr, Yb combined microalloying, so that alloy is in the low strength range that Sc contents are 0.007 0.053wt.%, with significant ageing strengthening effect, and intensity often increases 10MPa, cost has decreased to 1.06 1.24 yuan/kilogram by 7.7 yuan/kilogram, has good cost performance.

Description

A kind of Al-Yb-Zr alloys of the low Sc contents of reinforcing

Technical field

The invention belongs to technical field of alloy material, and in particular to a kind of low Sc of reinforcing by combined microalloying contains The Al-Yb-Zr alloys of amount.

Background technology

Microalloying is to improve alloy by adding the rare earths such as micro Sc, Zr, Yb and transition elements in aluminium alloy One of effective way of comprehensive performance.Wherein the maximum solid solution degree of Yb is 0.0248at.%, and a large amount of nanoscale tool can be precipitated There is the Al of L12 structures₃Yb phases can play the reinforcing effect of disperse educt.Maximum solid solution degrees of the Zr in aluminium be 0.083at.%, and the addition of Zr can improve the elevated temperature strength and thermal stability of alloy.It can be carried after the compound addition of Yb, Zr The intensity of high-aluminium alloy, but since the solid solubility of the two is relatively low, cause the maximum intensity of alloy and reinforcing effect limited.

Maximum solid solution degrees of the Sc in aluminium is 0.38wt.% (0.23at.%), than other micro alloying elements in aluminium Solid solubility it is much greater, the precipitated phase of more volume score can be generated.But Sc contents it is relatively low when, at high temperature (400 DEG C) Can not disperse educt, or even entirely without ageing strengthening effect.And the unit price of Al-5wt%Sc is up to 2000 yuan/kilogram, expensive The addition of Sc can increase the production cost of aluminium alloy, limit its a large amount of use industrially.

To sum up, the addition of Yb elements can form big forming core number density, and Zr elements add the thermal stability that alloy can be improved, and Under these conditions, a small amount of addition of Sc elements just can be obtained precipitating reinforcing effect, thus the present invention combination Yb, Zr, Sc with Upper feature probes into the ageing strengthening feature of Al-Zr-Yb-Sc quaternary alloys, in relatively low Sc content ranges, finds with preferable Mechanical property composition range, while having both cost.

Invention content

It is an object of the invention to the methods by combined microalloying, provide a kind of Al-Yb- of the low Sc contents of reinforcing Zr alloys so that for Sc contents in relatively low range, alloy has preferable mechanical property and good cost performance, is improved particularly Economic cost performance is suitble to industrialization.

The purpose of the present invention is achieved through the following technical solutions：

A kind of Al-Yb-Zr alloys of the low Sc contents of reinforcing, ingredient are：Sc is 0-0.101wt.%, Yb 0.052- 0.086wt.%, Zr 0.161-0.21wt.%, surplus are Al and inevitable impurity.The preferred section of wherein Sc elements is 0.007-0.053wt.%.

The preparation method of the alloy is that the intermediate alloy of Al-Sc, Al-Zr, Al-Yb are added during smelting aluminum, is melted It is 780 ± 10 DEG C to refine temperature；It after reaching smelting temperature, is sufficiently stirred, progress swage, which is cast, after heat preservation stands 15 minutes is cast State alloy, is then heat-treated, and alloy material is obtained.

A kind of heat treatment process of the Al-Yb-Zr alloys of the low Sc contents of reinforcing of the present invention is, including following step Suddenly：

1. carrying out homogenizing annealing to cast alloy at 640 ± 10 DEG C, the cold-rolling deformation that deflection is 90% is then carried out, Later in 640 ± 10 DEG C of solution treatment 40-50 hours, water quenching to room temperature；

2. ageing treatment whens being carried out 2 hours etc. within the scope of 150-550 DEG C.It is further every in 150-550 DEG C of range expert Ageing treatment 2 hours whens 25 DEG C of heating wait.

The content range of the preferably low Sc of the present invention：0.007-0.053wt.%.

The advantages of technical solution of the present invention, is：

By combined microalloying method, the Al-Yb-Zr alloys of low Sc contents have been obtained, there is preferable ageing strengthening Effect, and intensity often increases 10MPa, cost by 7.7 yuan/kilogram have decreased to 1.06-1.24 members/kilogram, there is preferable property Valence ratio has prodigious industrial application value.

Description of the drawings

Fig. 1 be the Al-Yb-Zr alloys of different Sc contents it is equal whens timeliness hardness curve；

Fig. 2 is the peak hardness of Al-Yb-Zr alloys and is dissolved the difference of state hardness with the variation diagram of Sc contents.

Fig. 3 is that the Al-Yb-Zr-Sc alloys of different Sc contents are compared with the cost performance of Al-0.023Sc-0.178Zr alloys Figure.

Specific implementation mode

The present invention will be further described with reference to the accompanying drawings and embodiments, but the present invention is not limited to following embodiments. The intermediate alloy of Al-2wt%Sc, Al-3wt%Zr, Al-25wt%Yb, smelting temperature 780 are added during smelting aluminum ±10℃.It after reaching smelting temperature, is sufficiently stirred, heat preservation carries out swage after standing 15 minutes and casts to obtain cast alloy, obtains It is as shown in the table to measure ingredient by XRF for the alloy material of five kinds of heterogeneities.Cast alloy is carried out at 640 ± 10 DEG C equal Annealing is homogenized, the cold-rolling deformation that deflection is 90% is then carried out, later in 640 ± 10 DEG C of solution treatment 40-50 hours, water quenching To room temperature, finally carried out within the scope of 150-550 DEG C every 25 DEG C of heating in 2 hours it is equal whens ageing treatment.

1. technic metal ingredient of table

Embodiment 1:Bimodal effect is presented during timeliness in 275-500 DEG C equal in aluminium alloy in A1, sees Fig. 1；And Peak hardness is 524MPa, and the hardness number compared to solid solution condition is higher by 230MPa or so, sees Fig. 2；And from solid solution hardness to peak It is worth hardness, intensity often increases 10MPa, and required cost is only 1.06 yuan/kilogram, and 7.7 yuan/kilogram and A4 compared to A3 alloys close 2.27 yuan/kilogram of gold, hence it is evident that there is higher cost performance, see Fig. 3.

Embodiment 2：Aluminium alloy in A2 shows apparent bimodal peak timeliness state at 300-475 DEG C, sees Fig. 1；And Hardness when peak hardness is compared to solid solution state improves 342MPa, sees Fig. 2；And from solid solution hardness to peak hardness, intensity is every 10MPa is increased, required cost is also only 1.24 yuan/kilogram and A3 compared with A4, still has higher cost performance.

Comparative example 1：Aluminium alloy in A3 is whens equal during timeliness, and hardness maintains essentially in 250MPa or so, not It shows to strengthen effect, sees Fig. 1, and intensity often increases 10MPa, required cost is up to 7.7 yuan/kilogram, and cost is much high In A1 and A2 alloys.

Comparative example 2：Aluminium alloy in A4 is whens equal during timeliness, and peak timeliness state is not notable, and peak hardness is compared 94MPa is only improved in solid solution state hardness, sees Fig. 1 and 2, and intensity often increases 10MPa, required cost is 2.27 yuan/kilogram, cost It is higher by one times compared to A1 alloys.

Comparative example 3：Tow-peaks aging feature is presented during timeliness whens aluminium alloy in A5 is equal at 275-500 DEG C, sees Fig. 1, And the peak hardness of alloy improves 346MPa compared to solid solution state hardness, but compared to A2 alloys, the intensity of raising is only more 4MPa is shown in Fig. 2, and from solid solution state hardness to peak hardness, intensity often increases 10MPa, and required cost is 1.77 yuan/kilogram, sees Fig. 3, compared to 1.24 yuan/kilogram of A2 alloys, cost also slightly improves.

In conclusion the Sc content preferred scopes of the Al-Yb-Zr alloys of the low Sc of reinforcing provided by the invention：0.007- 0.053wt.% has preferable ageing strengthening effect at this time, and intensity often increases 10MPa, and cost is declined by 7.7 yuan/kilogram Arrived 1.06-1.24 member/kilogram, have good cost performance.

Claims

1. the Al-Yb-Zr alloys of the low Sc of reinforcing a kind of, which is characterized in that ingredient is：Sc is 0-0.101wt.%, and Yb is 0.052-0.086wt.%, Zr 0.161-0.21wt.%, surplus are Al and inevitable impurity.

2. the Al-Yb-Zr alloys of the low Sc of reinforcing described in accordance with the claim 1 a kind of, which is characterized in that wherein Sc elements It is preferred that section is 0.007-0.053wt.%.

3. the method for preparing the Al-Yb-Zr alloys of the low Sc of reinforcing as claimed in claim 1 or 2 a kind of, which is characterized in that molten The intermediate alloy of Al-Sc, Al-Zr, Al-Yb are added during aluminium metallurgy, smelting temperature is 780 ± 10 DEG C；Reach smelting temperature Afterwards, it is sufficiently stirred, heat preservation carries out swage after standing 15 minutes and casts to obtain cast alloy, is then heat-treated, obtains alloy Material.

4. according to the method for claim 3, which is characterized in that heat treatment process is to include the following steps：

(1) homogenizing annealing is carried out to cast alloy at 640 ± 10 DEG C, then carries out the cold-rolling deformation that deflection is 90%, it Afterwards in 640 ± 10 DEG C of solution treatment 40-50 hours, water quenching to room temperature；

(2) ageing treatment whens being carried out 2 hours etc. within the scope of 150-550 DEG C.

5. according to the method for claim 3, which is characterized in that step (2) be 150-550 DEG C of range expert often heat up 25 DEG C into Ageing treatment 2 hours whens row etc..