CN105525234A

CN105525234A - Method for testing influence of solid solution aging treatment on performance of Al-Cu-Mg-Ag alloy containing Zr and Mn

Info

Publication number: CN105525234A
Application number: CN201410519537.9A
Authority: CN
Inventors: 季梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-09-30
Filing date: 2014-09-30
Publication date: 2016-04-27

Abstract

The invention provides a method for testing influence of solid solution aging treatment on performance of an Al-Cu-Mg-Ag alloy containing Zr and Mn. Raw materials adopt industrial pure aluminum, pure magnesium and pure silver and Al-Cu, Al-Mn and Al-Zr intermediate alloys; an ingot metallurgy method is adopted to prepare an Al-5.3 Cu-0.8 Mg-0.5 Ag-0.3 Mn-0.5 Zr (mass fraction/%) alloy ingot; the surface milling is performed for the ingot after homogenization treatment for 24 hours at 500 DEG C; then, the ingot is hotly rolled to 6 mm after being insulated for 2 hours at 460 DEG C, and is coldly rolled to 3 mm; a sample is cut and stretched in the rolling direction, is quenched by water after solid solution treatment, and is aged for 4 hours at 185 DEG C; and the DSC analysis of the alloy, the room-temperature mechanical performance test and the microscopic structure observation of the alloy are performed to further research the influence of different solid solution aging treatments on the performance of the Al-Cu-Mg-Ag alloy containing Zr and Mn so as to further conveniently improve the performance of the Al-Cu-Mg-Ag alloy containing Zr and Mn. The method belongs to the field of research of mechanical performance of the alloy.

Description

The method that test fixation rates affects the Al-Cu-Mg-Ag alloy property containing Zr, Mn

Technical field

The present invention relates to a kind of testing method, belong to Mg-Zn-Zr-Y alloy property research field.

Background technology

The traditional wrought aluminium alloy taking 2219,2124 and 2618 aluminium alloys as representative, due to its higher intensity and good resistance toheat, is widely used in aerospace structure material.Along with the development of aeronautical and space technology, also more and more higher to the requirement of aluminum alloy materials working temperature, the performance of aluminum current alloy is difficult to the requirement of the structure units such as satisfied high-speed aircraft of new generation, thruster.In order to improve the heat resisting temperature of aluminium alloy further, Chinese scholars has carried out large quantifier elimination, mainly concentrates on the aspects such as precipitated phase research and compound interpolation.As compared to traditional aluminium alloy 2219,2618 etc., the Al-Cu-Mg containing Ag has better mechanical behavior under high temperature.This can promote that alloy is along { a kind of new ageing strengthening phase (Ω phase) is separated out in 111} face owing to adding micro-Ag in Al-Cu-Mg alloy.This phase has excellent coarsening-resistant performance at a higher temperature, thus improves the mechanical behavior under high temperature of alloy.Therefore, Al-Cu-Mg-Ag system alloy has good high-strength temperature-resistant performance and resistant to damage performance, is a kind of heat-resisting aluminium alloy got a good chance of for future supersonic aircraft and tub, in a lot of fields extensive application such as aerospace.Al-Cu-Mg-Ag is a kind of typical ageing strengthening alloy, and the raising of solution treatment alloy performance is particularly important.Solution treatment is to obtain maximum degree of supersaturation thus being conducive to ag(e)ing process below, makes alloy obtain larger strengthening.So, in order to ensure that the strengthening phase constituent element of maximum quantity dissolves in matrix, not causing burning and grain growth again, suitable solid solubility temperature and soaking time must be selected.This work mainly studies Al-Cu-Mg-Ag alloy solid solution treatment process and its mechanical property and relation between organizing, the thermal treatment process route of reasonable, and then improves the over-all properties of this alloy.

Summary of the invention

The object of the invention is to: the test method that fixation rates affects the Al-Cu-Mg-Ag alloy property containing Zr, Mn is provided, to study the impact of different fixation rates on the Al-Cu-Mg-Ag alloy property containing Zr, Mn further, thus be convenient to the performance improving the Al-Cu-Mg-Ag alloy containing Zr, Mn further.

The solution of the present invention is as follows: the method that test fixation rates affects the Al-Cu-Mg-Ag alloy property containing Zr, Mn, and the step of described method is as follows:

Employing starting material are commercial-purity aluminium, pure magnesium and fine silver and A1-Cu, A1-Mn and A1-Zr master alloy, ingot metallurgy method is adopted to prepare Al-5.3Cu-0.8Mg-0.5Ag-0.3Mn-0.5Zr (massfraction/%) alloy cast ingot, ingot casting carry out milling face after 500 DEG C/24h Homogenization Treatments, then after being incubated 2h at 460 DEG C by slab hot-rolling to 6mm, be cold-rolled to 3mm again, tension specimen is intercepted along rolling direction, sample is after solution treatment, shrend, then 185 DEG C/4h carries out ageing treatment;

Carry out the dsc analysis of alloy, room-temperature mechanical property test and the microstructure observation of alloy;

The dsc analysis of alloy carries out on SDT-Q600 thermal analyzer, room-temperature mechanical property test is carried out on CSS-44100 electronic universal material testing machine, rate of extension is 10-3s-1, adopts the microtexture of POLY-VER-MET metaloscope and Philip Sirion200 field emission microscopy observation alloy.

About TEM sample first uses silicon carbide paper and abrasive paper for metallograph mechanical reduction to 100 μm, stamping-out becomes the disk of 3mm, then on MTP-1A type double-boost electrolysis thinner, two spray is carried out thinning, two spray voltage is 12 ~ 15V, working current 80 ~ 100mA, by cooled with liquid nitrogen in two spray process, temperature controls below-20 DEG C, two hydrojet adopts nitric acid, methyl alcohol mixed liquor, alcohol washes twice is used again after all samples carrying out tem observation all must first rinse with water after perforation, TEM structure observation carries out in TEC-NAIG220 Electronic Speculum, and acceleration voltage is 200kV.

Compared with prior art, major advantage is research Al-Cu-Mg-Ag alloy solid solution treatment process and its mechanical property and the relation between organizing, the thermal treatment process route of reasonable, and then improves the over-all properties of this alloy in the present invention.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly, below the present invention is described in further detail.

Embodiment

The test method that fixation rates affects the Al-Cu-Mg-Ag alloy property containing Zr, Mn is provided:

Employing starting material are commercial-purity aluminium, pure magnesium and fine silver and A1-Cu, A1-Mn and A1-Zr master alloy.Ingot metallurgy method is adopted to prepare Al-5.3Cu-0.8Mg-0.5Ag-0.3Mn-0.5Zr (massfraction/%) alloy cast ingot.Ingot casting carry out milling face after 500 DEG C/24h Homogenization Treatments, after being then incubated 2h at 460 DEG C by slab hot-rolling to 6mm, then be cold-rolled to 3mm.Tension specimen is intercepted along rolling direction.Sample after the process of different solid solution system, shrend, then carry out ageing treatment in 185 DEG C/4h.The dsc analysis of alloy carries out on SDT-Q600 thermal analyzer.Room-temperature mechanical property test is carried out on CSS-44100 electronic universal material testing machine, and rate of extension is 10-3s-1.Adopt the microtexture of POLY-VER-MET metaloscope and Philip Sirion200 field emission microscopy observation alloy.About TEM sample first uses silicon carbide paper and abrasive paper for metallograph mechanical reduction to 100 μm, stamping-out becomes the disk of  3mm, on MTP-1A type double-boost electrolysis thinner, then carries out two spray thinning.Two spray voltage is 12 ~ 15V, working current 80 ~ 100mA.By cooled with liquid nitrogen in two spray process, temperature controls below-20 DEG C.Two hydrojet adopts nitric acid, methyl alcohol mixed liquor (1: 3).Alcohol washes twice is used again after all samples carrying out tem observation all must first rinse with water after perforation.TEM structure observation carries out in TEC-NAIG220 Electronic Speculum, and acceleration voltage is 200kV.

Table 1 is the tensile property impact of different solid solubility temperature (510 ~ 525 DEG C) and solution time alloy.Can find out, along with the raising of solid solubility temperature, the yield strength σ 0.2 of alloy and tensile strength sigma b all in first increasing rear slowly downward trend, reaches maximum value in 515 degree.The elongation δ of alloy is also in first increasing rear downward trend, reaching peak value equally at 515 DEG C.Solid solubility temperature should lower than burnt temperature 10 ~ 15 DEG C, and under the prerequisite meeting mechanical property, the solid solubility temperature that hot-rolled sheet is suitable for should control to be advisable at about 515 DEG C.

Choose 515 DEG C of solid solubility temperatures as alloy and carry out different solution time experiment, experimental result is in table 2.Found out by table 2, solid solution in 1 ~ 2.5h, not significantly, be all the prolongation along with solution time, slowly increase, 1.5h reaches intensity peak for alloy yield strength and tensile strength change; Continue to extend solution time, intensity slowly reduces.Alloy elongation change is comparatively obvious, slowly raises before this, and reaches maximum value during 1.5h, and extended solution time further, and elongation declines.As a whole, when solution time is 1.5h, alloy has best strong plasticity cooperation.

Conclusion: along with the raising of solid solubility temperature, the yield strength σ 0.2 of alloy and tensile strength sigma b all in first increasing rear slowly downward trend, reaches maximum value when 515 DEG C/1.5h.The solution treatment system that alloy is suitable for is 515 DEG C/1.5h, and its tensile strength is 503MPa, and elongation is 12.3%.

Claims

1. test the method that fixation rates affects the Al-Cu-Mg-Ag alloy property containing Zr, Mn, it is characterized in that the step of described method is as follows:

Carry out the dsc analysis of alloy, room-temperature mechanical property test and the microstructure observation of alloy.

2. test the method that fixation rates affects the Al-Cu-Mg-Ag alloy property containing Zr, Mn according to claim 1, it is characterized in that: the dsc analysis of alloy carries out on SDT-Q600 thermal analyzer, room-temperature mechanical property test is carried out on CSS-44100 electronic universal material testing machine, rate of extension is 10-3s-1, adopts the microtexture of POLY-VER-MET metaloscope and Philip Sirion200 field emission microscopy observation alloy.

3. test fixation rates according to claim 1 to containing Zr, the method of the Al-Cu-Mg-Ag alloy property impact of Mn, it is characterized in that: about TEM sample first uses silicon carbide paper and abrasive paper for metallograph mechanical reduction to 100 μm, stamping-out becomes the disk of 3mm, then on MTP-1A type double-boost electrolysis thinner, two spray is carried out thinning, two spray voltage is 12 ~ 15V, working current 80 ~ 100mA, by cooled with liquid nitrogen in two spray process, temperature controls below-20 DEG C, two hydrojet adopts nitric acid, methyl alcohol mixed liquor, alcohol washes twice is used again after all samples carrying out tem observation all must first rinse with water after perforation, TEM structure observation carries out in TEC-NAIG220 Electronic Speculum, acceleration voltage is 200kV.