Change of Acoustic Emission Characteristics during Temperature Induced Transition from Twinning to Dislocation Slip under Compression in Polycrystalline Sn
In this study, acoustic emission (AE) measurements on polycrystalline tin as a function of temperature at different driving rates under compression were carried out. It is shown that there is a definite difference between the acoustic emission characteristics belonging to twinning (low temperatures)...
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| author | Lajos Daróczi Tarek Yousif Elrasasi Talaye Arjmandabasi László Zoltán Tóth Bence Veres Dezső László Beke |
| author_facet | Lajos Daróczi Tarek Yousif Elrasasi Talaye Arjmandabasi László Zoltán Tóth Bence Veres Dezső László Beke |
| author_sort | Lajos Daróczi |
| collection | DOAJ |
| description | In this study, acoustic emission (AE) measurements on polycrystalline tin as a function of temperature at different driving rates under compression were carried out. It is shown that there is a definite difference between the acoustic emission characteristics belonging to twinning (low temperatures) as well as to dislocation slip (high temperatures). The stress averaged values of the exponents of the energy probability density functions decreased from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ε</mi></mrow></semantics></math></inline-formula> = 1.45 ± 0.05 (−60 °C) to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ε</mi></mrow></semantics></math></inline-formula> = 1.20 ± 0.15 (50 °C) at a driving rate of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ε</mi><mo>=</mo><mn>0.15</mn><mo> </mo><msup><mi mathvariant="normal">s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>, and the total acoustic energy decreased by three orders of magnitude with increasing temperature. In addition, the exponent <i>γ</i> in the scaling relation <i>S<sub>AE</sub>~D<sub>AE</sub><sup>γ</sup></i> (<i>S</i><i><sub>AE</sub></i> is the area and <i>D</i><i><sub>AE</sub></i> is the duration) also shows similar temperature dependence (changing from <i>γ</i> = 1.78 ± 0.08 to <i>γ</i> = 1.35 ± 0.05), illustrating that the avalanche statistics belong to two different microscopic deformation mechanisms. The power law scaling relations were also analyzed, taking into account that the detected signal is always the convolution of the source signal and the transfer function of the system. It was obtained that approximate values of the power exponents can be obtained from the parts of the above functions, belonging to large values of parameters. At short duration times, the attenuation effect of the AE detection system dominates the time dependence, from which the characteristic attenuation time, <i>τ<sub>a</sub></i>, was determined as <i>τ<sub>a</sub></i> ≅ 70 μs. |
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| spelling | doaj.art-cd7e75689ccd4ae5bb413b7a84bffa4b2023-11-23T11:50:03ZengMDPI AGMaterials1996-19442021-12-0115122410.3390/ma15010224Change of Acoustic Emission Characteristics during Temperature Induced Transition from Twinning to Dislocation Slip under Compression in Polycrystalline SnLajos Daróczi0Tarek Yousif Elrasasi1Talaye Arjmandabasi2László Zoltán Tóth3Bence Veres4Dezső László Beke5Department of Solid State Physics, University of Debrecen, P.O. Box 400, H-4002 Debrecen, HungaryDepartment of Solid State Physics, University of Debrecen, P.O. Box 400, H-4002 Debrecen, HungaryDepartment of Solid State Physics, University of Debrecen, P.O. Box 400, H-4002 Debrecen, HungaryDepartment of Solid State Physics, University of Debrecen, P.O. Box 400, H-4002 Debrecen, HungaryDepartment of Solid State Physics, University of Debrecen, P.O. Box 400, H-4002 Debrecen, HungaryDepartment of Solid State Physics, University of Debrecen, P.O. Box 400, H-4002 Debrecen, HungaryIn this study, acoustic emission (AE) measurements on polycrystalline tin as a function of temperature at different driving rates under compression were carried out. It is shown that there is a definite difference between the acoustic emission characteristics belonging to twinning (low temperatures) as well as to dislocation slip (high temperatures). The stress averaged values of the exponents of the energy probability density functions decreased from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ε</mi></mrow></semantics></math></inline-formula> = 1.45 ± 0.05 (−60 °C) to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ε</mi></mrow></semantics></math></inline-formula> = 1.20 ± 0.15 (50 °C) at a driving rate of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ε</mi><mo>=</mo><mn>0.15</mn><mo> </mo><msup><mi mathvariant="normal">s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>, and the total acoustic energy decreased by three orders of magnitude with increasing temperature. In addition, the exponent <i>γ</i> in the scaling relation <i>S<sub>AE</sub>~D<sub>AE</sub><sup>γ</sup></i> (<i>S</i><i><sub>AE</sub></i> is the area and <i>D</i><i><sub>AE</sub></i> is the duration) also shows similar temperature dependence (changing from <i>γ</i> = 1.78 ± 0.08 to <i>γ</i> = 1.35 ± 0.05), illustrating that the avalanche statistics belong to two different microscopic deformation mechanisms. The power law scaling relations were also analyzed, taking into account that the detected signal is always the convolution of the source signal and the transfer function of the system. It was obtained that approximate values of the power exponents can be obtained from the parts of the above functions, belonging to large values of parameters. At short duration times, the attenuation effect of the AE detection system dominates the time dependence, from which the characteristic attenuation time, <i>τ<sub>a</sub></i>, was determined as <i>τ<sub>a</sub></i> ≅ 70 μs.https://www.mdpi.com/1996-1944/15/1/224stress/strain measurementsacoustic emissionSnplasticitytwinningdislocation slip |
| spellingShingle | Lajos Daróczi Tarek Yousif Elrasasi Talaye Arjmandabasi László Zoltán Tóth Bence Veres Dezső László Beke Change of Acoustic Emission Characteristics during Temperature Induced Transition from Twinning to Dislocation Slip under Compression in Polycrystalline Sn Materials stress/strain measurements acoustic emission Sn plasticity twinning dislocation slip |
| title | Change of Acoustic Emission Characteristics during Temperature Induced Transition from Twinning to Dislocation Slip under Compression in Polycrystalline Sn |
| title_full | Change of Acoustic Emission Characteristics during Temperature Induced Transition from Twinning to Dislocation Slip under Compression in Polycrystalline Sn |
| title_fullStr | Change of Acoustic Emission Characteristics during Temperature Induced Transition from Twinning to Dislocation Slip under Compression in Polycrystalline Sn |
| title_full_unstemmed | Change of Acoustic Emission Characteristics during Temperature Induced Transition from Twinning to Dislocation Slip under Compression in Polycrystalline Sn |
| title_short | Change of Acoustic Emission Characteristics during Temperature Induced Transition from Twinning to Dislocation Slip under Compression in Polycrystalline Sn |
| title_sort | change of acoustic emission characteristics during temperature induced transition from twinning to dislocation slip under compression in polycrystalline sn |
| topic | stress/strain measurements acoustic emission Sn plasticity twinning dislocation slip |
| url | https://www.mdpi.com/1996-1944/15/1/224 |
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