CN109917023A - A kind of magnesium alloy LPSO structural appraisal method based on acoustic emission - Google Patents
A kind of magnesium alloy LPSO structural appraisal method based on acoustic emission Download PDFInfo
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- CN109917023A CN109917023A CN201910207537.8A CN201910207537A CN109917023A CN 109917023 A CN109917023 A CN 109917023A CN 201910207537 A CN201910207537 A CN 201910207537A CN 109917023 A CN109917023 A CN 109917023A
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Abstract
The present invention discloses a kind of magnesium alloy LPSO structural appraisal method based on acoustic emission, including carrying out acoustic emission detection to magnesium alloy to be measured, using disconnected lead signal as pumping signal, measure the energy attenuation rate of magnesium alloy pumping signal to be measured, pass through acoustic attenuation coefficient, and compared with the benchmark under the conditions of same detection without LPSO structure magnesium alloy, assessment magnesium alloy whether there is LPSO structure.For the acoustic attenuation coefficient of magnesium alloy materials to be measured less than the acoustic attenuation coefficient 1dB/cm or more of no LPSO structure magnesium alloy materials, magnesium alloy materials to be measured have LPSO structure；Conversely, magnesium alloy materials to be measured are without LPSO structure.When the present invention assesses magnesium alloy LPSO structure detection, detected material will not be damaged, be able to maintain the complete of material structure and function.Meanwhile large batch of magnesium alloy materials are faced, the present invention assesses magnesium alloy by different acoustic attenuation coefficients, and whether there is or not LPSO structures, and the appraisal procedure is simple and high-efficient, are a kind of magnesium alloy LPSO structural appraisal methods based on acoustic emission.
Description
Technical field
The invention belongs to material field of non destructive testing, be a kind of judgement magnesium alloy LPSO structure based on acoustic emission without
Damage detection method.
Background technique
Magnesium alloy since its density is low, specific strength is high, damping performance is good, electrical and thermal conductivity performance is good, Aeronautics and Astronautics,
The industrial departments such as transport, chemical industry, electronics wait until to be widely applied, but magnesium alloy strength is low also to restrict the development of magnesium alloy.
Rare earth element is added in magnesium alloy extensively because having significant solution strengthening and precipitation strength effect.However work as rare earth
When element addition is excessive, alloy plasticity is remarkably decreased, and limits the promotion of alloy strength instead.In recent years, a kind of novel knot
The discovery of orderly (Long period stacking ordered, the LPSO) structure of structure-long period provides to solve this problem
Opportunity.Japanese scholars Kawamura etc. is prepared for the Mg of structure containing LPSO by quickly solidification/powder metallurgy97Y2Zn1Alloy, room
Warm intensity is more than 600MPa, and elongation percentage still can achieve 5%.
LPSO structure is a current research hotspot, and LPSO structure has significant impact to magnesium alloy mechanical performance.It grinds
The person of studying carefully thinks that this structure can be further improved intensity and plasticity, the room temperature of alloy and high temperature tensile properties and the creep resistant of alloy
Performance etc..LPSO structure is generally detected by Metallographic Analysis, is needed to grind sample, is observed its Cross Section Morphology, is parsed into
Point etc., so that it is determined that the three-dimensional space pattern of Magnesium Alloy.Detecting magnesium alloy by Metallographic Analysis, whether there is or not LPSO structure, processes
It is cumbersome, it is with high costs, it is unfavorable for the use of industrial circle.The present invention measures the acoustic attenuation coefficient of magnesium alloy by acoustic emission equipment
To assess magnesium alloy, whether there is or not LPSO structures, are a kind of lossless detection methods, have the characteristics that convenient and efficient and high-efficient.
Summary of the invention
A kind of magnesium alloy LPSO structural appraisal method based on acoustic emission of the present invention, overcoming traditional detection method needs
The deficiencies of destroying sampling, with high costs and heavy workload, provide a kind of magnesium alloy LPSO structure based on acoustic emission without
New Evaluation Method is damaged, to guarantee to be detected structural intergrity, detection efficiency is improved, reduces testing cost.
A kind of magnesium alloy LPSO structural appraisal method based on acoustic emission of the present invention includes the following steps.
Determine that magnesium alloy materials of the certain amount without LPSO structure as sample, measure letter using acoustic emission equipment first
Number straight line fitting is carried out as transmission range is increased character of energy damping, and to it in sample material, obtains sample material
Acoustic attenuation coefficient, that is, fitting a straight line slope, the value for no LPSO structure magnesium alloy materials acoustic attenuation coefficient.
With benchmark without LPSO structure magnesium alloy materials under identical testing conditions, measure magnesium to be measured using acoustic emission equipment
The acoustic attenuation coefficient of alloy material is assessed magnesium and is closed by comparing with benchmark without the acoustic attenuation coefficient of LPSO structure magnesium alloy materials
Gold is whether there is or not LPSO structure, the acoustic attenuation coefficient of the acoustic attenuation coefficients of magnesium alloy materials to be measured less than no LPSO structure magnesium alloy materials
1dB/cm or more, magnesium alloy materials to be measured have LPSO structure；Conversely, magnesium alloy materials to be measured are without LPSO structure.
According to the present invention, the step [0006], acoustic emission device and its corollary equipment in [0007], including sound emission
Sensor, preamplifier, signal transmission apparatus and signal processing system；Acoustic emission signal is quasi- by the standard lead stamp that breaks in experiment
It generates.
Compared with existing magnesium alloy LPSO structure detection method, the present invention overcomes traditional detection methods need to be to all quilts
Test object carries out destroying sampling one by one, and the deficiency of damage can be caused to detected material.The present invention is to magnesium alloy LPSO structure
When check and evaluation, detected material will not be damaged, be able to maintain the complete of material structure and function；Simultaneously in face of large quantities of
The magnesium alloy materials of amount, the present invention assesses magnesium alloy by different acoustic attenuation coefficients, and whether there is or not LPSO structure, appraisal procedure letters
It is single and high-efficient.
Detailed description of the invention
A kind of magnesium alloy LPSO structural appraisal method flow diagram based on acoustic emission of Fig. 1.
Fig. 2 acoustic emission sensor pastes schematic diagram.
Whether there is or not LPSO structure magnesium alloys to interrupt lead signal transmission distance and energy attenuation rate corresponding relationship by Fig. 3.
Specific embodiment
A kind of magnesium alloy LPSO structural appraisal method based on acoustic emission of the present invention includes the following steps.
Determine that magnesium alloy materials of the certain amount without LPSO structure as sample, measure letter using acoustic emission equipment first
Number straight line fitting is carried out as transmission range is increased character of energy damping, and to it in sample material, obtains sample material
Acoustic attenuation coefficient, that is, fitting a straight line slope, the value for no LPSO structure magnesium alloy materials acoustic attenuation coefficient；With benchmark without
LPSO structure magnesium alloy materials measure the acoustic attenuation of magnesium alloy materials to be measured using acoustic emission equipment under identical testing conditions
Coefficient, assesses magnesium alloy by comparing with benchmark without the acoustic attenuation coefficient of LPSO structure magnesium alloy materials whether there is or not LPSO structure,
The acoustic attenuation coefficient of magnesium alloy materials to be measured less than no LPSO structure magnesium alloy materials acoustic attenuation coefficient 1dB/cm or more, it is to be measured
Magnesium alloy materials have LPSO structure；Conversely, magnesium alloy materials to be measured are without LPSO structure.
Below in conjunction with specific embodiment, to a kind of magnesium alloy LPSO structural appraisal method based on acoustic emission of the present invention
It is described further.
Magnesium alloy sample material in the present embodiment is Mg containing eutectic phase24(Gd,Y)5Mg-Gd-Y-Zr alloy cast ingot, to
Survey magnesium alloy materials are the LPSO structure Mg-Gd-Y-Zn-Zr alloy cast ingot containing 14H, but in the present embodiment for the ease of verifying
For magnesium alloy whether there is or not LPSO structural appraisal method, it is known that magnesium alloy materials to be measured, which have LPSO structure,.Magnesium alloy sample material and
Magnesium alloy materials to be measured technique all molding by extrusion, the Mg of Mg-Gd-Y-Zr alloy24(Gd,Y)5Eutectic phased soln, then pass through
Annealing guarantees test experiments so that there is the magnesium alloy of LPSO structure approximate consistent with the magnesium alloy crystal grain of no LPSO structure
Unitary variant, to prove a kind of validity of the magnesium alloy LPSO structural appraisal method based on acoustic emission.This implementation
Acoustic emission signal acquisition system is the PCI-2 system and corollary equipment of U.S. PAC company in example.If Fig. 2 is acoustic emission sensor
Paste schematic diagram, S1~S3Representative sensor 1~3；S1~S3The paste position of sensor be on magnesium alloy test specimen center line,
S simultaneously1~S330mm is divided between two-by-two.
(a) it determines without LPSO structure Mg-Gd-Y-Zr alloy extrusions as sample, is measured using acoustic emission equipment first
Signal and passes through formula as transmission range is increased character of energy damping in sample material out: α=20log (Em/E1) change
It is counted as energy attenuation rate, E1For the nearest S of detachment lead point1Signal collected energy value, EmFor sensor SmSignal collected
Energy value, m=1,2,3；Indicate the number of sensor.Straight line fitting is carried out to it simultaneously, obtains the acoustic attenuation system of sample material
Number be fitting a straight lines slope, the value for no LPSO structure magnesium alloy materials acoustic attenuation coefficient.As can be seen from Figure 3 benchmark without
The corresponding acoustic attenuation coefficient of LPSO structure Mg-Gd-Y-Zr alloy is k=3.6635dB/cm.
(b) acoustic attenuation coefficient that magnesium alloy materials to be measured are measured using acoustic emission equipment, by with benchmark without LPSO structure
To assess magnesium alloy to be measured, whether there is or not LPSO structure, the acoustic attenuations of magnesium alloy materials to be measured for the acoustic attenuation coefficient comparison of magnesium alloy materials
For coefficient less than the acoustic attenuation coefficient 1dB/cm or more of no LPSO structure magnesium alloy materials, magnesium alloy materials to be measured have LPSO structure；
Conversely, magnesium alloy materials to be measured are without LPSO structure.The corresponding acoustic attenuation coefficient of magnesium alloy materials to be measured is k as can be seen from Figure 31
=1.8942dB/cm.The acoustic attenuation coefficient of magnesium alloy materials to be measured is less than acoustic attenuation of the benchmark without LPSO structure magnesium alloy materials
Coefficient 1dB/cm or more, it is known that magnesium alloy materials to be measured have LPSO structure, and the appraisal procedure is simple and high-efficient.
Through this embodiment as it can be seen that a kind of magnesium alloy LPSO structural appraisal method based on acoustic emission of the present invention can
It evaluates no LPSO structure and has LPSO structure magnesium alloy.It, will not be to quilt when the present invention assesses magnesium alloy LPSO structure detection
Detection material damages, and is able to maintain the complete of material structure and function；Large batch of magnesium alloy materials, this hair are faced simultaneously
Bright to assess magnesium alloy by different acoustic attenuation coefficients whether there is or not LPSO structures, the appraisal procedure is simple and high-efficient, is a kind of base
In the new magnesium alloy LPSO structural appraisal method of acoustic emission.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is made
With the limitation of range.
Claims (4)
1. a kind of magnesium alloy LPSO structural appraisal method based on acoustic emission, it is characterised in that the following steps are included:
(a) determine that magnesium alloy materials of the certain amount without LPSO structure as sample, measure letter using acoustic emission equipment first
Number straight line fitting is carried out as transmission range is increased character of energy damping, and to it in sample material, obtains sample material
Acoustic attenuation coefficient, that is, fitting a straight line slope, the value for no LPSO structure magnesium alloy materials acoustic attenuation coefficient；
(b) and benchmark without LPSO structure magnesium alloy materials under identical testing conditions, measure magnesium to be measured using acoustic emission equipment
The acoustic attenuation coefficient of alloy material is assessed magnesium and is closed by comparing with benchmark without the acoustic attenuation coefficient of LPSO structure magnesium alloy materials
Gold is whether there is or not LPSO structure, the acoustic attenuation coefficient of the acoustic attenuation coefficients of magnesium alloy materials to be measured less than no LPSO structure magnesium alloy materials
1dB/cm or more, magnesium alloy materials to be measured have LPSO structure；Conversely, magnesium alloy materials to be measured are without LPSO structure.
2. a kind of magnesium alloy LPSO structural appraisal method based on acoustic emission as described in claim 1, which is characterized in that energy
Measure the calculation formula of attenuation rate are as follows: α=20log (Em/E1), in formula: E1For the signal collected energy value of sensor 1, EmTo pass
Sensor m signal collected energy value；Detachment lead point is sensor 1 recently, and m indicates the number of receiving sensor, the number
Since 2, quantity is determined by the size of test specimen.
3. a kind of magnesium alloy LPSO structural appraisal method based on acoustic emission as described in claim 1, which is characterized in that institute
State step (a), the acoustic emission sensor in (b) is pasted on the upside of magnesium alloy test specimen, S1~Sm1~m of representative sensor；S1~Sm
The paste position of sensor is the S on magnesium alloy test specimen center line1~Sm30mm~40mm is divided between two-by-two, meanwhile, S1、SmIt passes
Sensor is at a distance from its straight line limit at least more than 30mm.
4. a kind of magnesium alloy LPSO structural appraisal method based on acoustic emission as described in claim 1, which is characterized in that institute
Step (a), the acoustic emission equipment in (b) are stated, mainly includes acoustic emission sensor, couplant, Acoustic emission signal processing software is preceding
Set amplifier；One sensor acquires pumping signal, and other sensors are connect by couplant and test specimen as receiving sensor
Touching, sensor are connected by preamplifier with computer.
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Cited By (1)
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| CN108801877A (en) * | 2018-06-19 | 2018-11-13 | 长沙理工大学 | A kind of composite material porosity evaluation method based on double-spectrum analysis |
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