Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy
The purpose of this investigation was to study the low-cycle fatigue (LCF) behavior of a newly developed high-pressure die-cast (HPDC) Al-5.5Mg-2.5Si-0.6Mn-0.2Fe (AlMgSiMnFe) alloy. The effect of heat-treatment in comparison with its as-cast counterpart was also identified. The layered (α-Al + Mg<...
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MDPI AG
2020-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/18/4115 |
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| author | Sohail Mohammed Shubham Gupta Dejiang Li Xiaoqin Zeng Daolun Chen |
| author_facet | Sohail Mohammed Shubham Gupta Dejiang Li Xiaoqin Zeng Daolun Chen |
| author_sort | Sohail Mohammed |
| collection | DOAJ |
| description | The purpose of this investigation was to study the low-cycle fatigue (LCF) behavior of a newly developed high-pressure die-cast (HPDC) Al-5.5Mg-2.5Si-0.6Mn-0.2Fe (AlMgSiMnFe) alloy. The effect of heat-treatment in comparison with its as-cast counterpart was also identified. The layered (α-Al + Mg<sub>2</sub>Si) eutectic structure plus a small amount of Al<sub>8</sub>(Fe,Mn)<sub>2</sub>Si phase in the as-cast condition became an in-situ Mg<sub>2</sub>Si particulate-reinforced aluminum composite with spherical Mg<sub>2</sub>Si particles uniformly distributed in the α-Al matrix after heat treatment. Due to the spheroidization of intermetallic phases including both Mg<sub>2</sub>Si and Al<sub>8</sub>(Fe,Mn)<sub>2</sub>Si, the ductility and hardening capacity increased while the yield stress (YS) and ultimate tensile strength (UTS) decreased. Portevin–Le Chatelier effect (or serrated flow) was observed in both tensile stress–strain curves and initial hysteresis loops during cyclic deformation because of dynamic strain aging caused by strong dislocation–precipitate interactions. The alloy exhibited cyclic hardening in both as-cast and heat-treated conditions when the applied total strain amplitude was above 0.4%, below which cyclic stabilization was sustained. The heat-treated alloy displayed a larger plastic strain amplitude and a lower stress amplitude at a given total strain amplitude, demonstrating a superior fatigue resistance in the LCF regime. A simple equation based on the stress amplitude of the first and mid-life cycles (<inline-formula><math display="inline"><semantics><mrow><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>f</mi><mi>i</mi><mi>r</mi><mi>s</mi><mi>t</mi></mrow></msub></mrow></semantics></math></inline-formula>, <inline-formula><math display="inline"><semantics><mrow><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>m</mi><mi>i</mi><mi>d</mi></mrow></msub></mrow></semantics></math></inline-formula>) was proposed to characterize the degree of cyclic hardening/softening (<i>D</i>): <inline-formula><math display="inline"><semantics><mrow><mi>D</mi><mo>=</mo><mo>±</mo><mfrac><mrow><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>m</mi><mi>i</mi><mi>d</mi></mrow></msub><mo> </mo><mo>−</mo><mo> </mo><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>f</mi><mi>i</mi><mi>r</mi><mi>s</mi><mi>t</mi></mrow></msub></mrow><mrow><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>f</mi><mi>i</mi><mi>r</mi><mi>s</mi><mi>t</mi></mrow></msub></mrow></mfrac><mo>,</mo></mrow></semantics></math></inline-formula> where the positive sign “+” represents cyclic hardening and the negative sign “−“ reflects cyclic softening. |
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| id | doaj.art-f2b8dadc2f9e428796d5ed5b179cc753 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T16:18:09Z |
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| spelling | doaj.art-f2b8dadc2f9e428796d5ed5b179cc7532023-11-20T13:57:09ZengMDPI AGMaterials1996-19442020-09-011318411510.3390/ma13184115Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum AlloySohail Mohammed0Shubham Gupta1Dejiang Li2Xiaoqin Zeng3Daolun Chen4Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, CanadaDepartment of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, CanadaState Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, ChinaState Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, ChinaDepartment of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, CanadaThe purpose of this investigation was to study the low-cycle fatigue (LCF) behavior of a newly developed high-pressure die-cast (HPDC) Al-5.5Mg-2.5Si-0.6Mn-0.2Fe (AlMgSiMnFe) alloy. The effect of heat-treatment in comparison with its as-cast counterpart was also identified. The layered (α-Al + Mg<sub>2</sub>Si) eutectic structure plus a small amount of Al<sub>8</sub>(Fe,Mn)<sub>2</sub>Si phase in the as-cast condition became an in-situ Mg<sub>2</sub>Si particulate-reinforced aluminum composite with spherical Mg<sub>2</sub>Si particles uniformly distributed in the α-Al matrix after heat treatment. Due to the spheroidization of intermetallic phases including both Mg<sub>2</sub>Si and Al<sub>8</sub>(Fe,Mn)<sub>2</sub>Si, the ductility and hardening capacity increased while the yield stress (YS) and ultimate tensile strength (UTS) decreased. Portevin–Le Chatelier effect (or serrated flow) was observed in both tensile stress–strain curves and initial hysteresis loops during cyclic deformation because of dynamic strain aging caused by strong dislocation–precipitate interactions. The alloy exhibited cyclic hardening in both as-cast and heat-treated conditions when the applied total strain amplitude was above 0.4%, below which cyclic stabilization was sustained. The heat-treated alloy displayed a larger plastic strain amplitude and a lower stress amplitude at a given total strain amplitude, demonstrating a superior fatigue resistance in the LCF regime. A simple equation based on the stress amplitude of the first and mid-life cycles (<inline-formula><math display="inline"><semantics><mrow><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>f</mi><mi>i</mi><mi>r</mi><mi>s</mi><mi>t</mi></mrow></msub></mrow></semantics></math></inline-formula>, <inline-formula><math display="inline"><semantics><mrow><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>m</mi><mi>i</mi><mi>d</mi></mrow></msub></mrow></semantics></math></inline-formula>) was proposed to characterize the degree of cyclic hardening/softening (<i>D</i>): <inline-formula><math display="inline"><semantics><mrow><mi>D</mi><mo>=</mo><mo>±</mo><mfrac><mrow><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>m</mi><mi>i</mi><mi>d</mi></mrow></msub><mo> </mo><mo>−</mo><mo> </mo><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>f</mi><mi>i</mi><mi>r</mi><mi>s</mi><mi>t</mi></mrow></msub></mrow><mrow><msub><mrow><mrow><mo>(</mo><mrow><mi mathvariant="sans-serif">Δ</mi><mi>σ</mi><mo>/</mo><mn>2</mn></mrow><mo>)</mo></mrow></mrow><mrow><mi>f</mi><mi>i</mi><mi>r</mi><mi>s</mi><mi>t</mi></mrow></msub></mrow></mfrac><mo>,</mo></mrow></semantics></math></inline-formula> where the positive sign “+” represents cyclic hardening and the negative sign “−“ reflects cyclic softening.https://www.mdpi.com/1996-1944/13/18/4115AlMgSiMnFe alloyheat treatmentlow-cycle fatiguecyclic hardeningserrated flow |
| spellingShingle | Sohail Mohammed Shubham Gupta Dejiang Li Xiaoqin Zeng Daolun Chen Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy Materials AlMgSiMnFe alloy heat treatment low-cycle fatigue cyclic hardening serrated flow |
| title | Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy |
| title_full | Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy |
| title_fullStr | Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy |
| title_full_unstemmed | Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy |
| title_short | Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy |
| title_sort | cyclic deformation behavior of a heat treated die cast al mg si based aluminum alloy |
| topic | AlMgSiMnFe alloy heat treatment low-cycle fatigue cyclic hardening serrated flow |
| url | https://www.mdpi.com/1996-1944/13/18/4115 |
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