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The creep behavior of 7050-T7451 aluminum alloy under different temperatures and stresses was studied by the uniaxial tensile creep test. Based on continuum damage mechanics, a constitutive model describing the creep behavior of aluminum alloy at high temperature was established. The model took into account the precipitation coarsening, dislocation multiplication/annihilation and microvoid formation during the creep process, and introduced the corresponding damage factor evolution formula to reflect these three damage processes. In addition, the model took into account the additional damage caused by stress increase to reveal the effect of stress on the creep damage. Based on the comparative analysis of the test results and the predicted results, it was verified that the established physical constitutive model can accurately describe the creep behavior of 7050 aluminum alloy under different temperatures and stresses.
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通过单轴拉伸蠕变试验,研究了7050-T7451铝合金在不同温度和应力下的蠕变行为。基于连续介质损伤力学,建立了描述铝合金高温蠕变行为的本构模型。该模型考虑了蠕变过程中的沉淀相粗化、位错增殖/湮灭和微孔洞形成等微观组织演化过程,并通过相应的损伤因子演化公式来反映这3个损伤过程,还考虑了应力增加所带来的额外损伤,以揭示应力对蠕变损伤的影响。基于试验结果和预测结果的对比分析,验证了所建立的物理本构模型可以较准确地描述7050铝合金在不同温度和应力条件下的蠕变行为。
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李杰,男,1998年生,山东日照人,在读硕士研究生;主要研究方向为金属材料蠕变变形的数字孪生仿真方法;E-mail:1971866212@qq.com。
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李杰,男,1998年生,山东日照人,在读硕士研究生;主要研究方向为金属材料蠕变变形的数字孪生仿真方法;E-mail:1971866212@qq.com。
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7050 test specimen, figureFileSmall=raNXtAFnuwm7A07R0/fTsw==, figureFileBig=pWvyNYVsaEWVvJaprTk9cA==, tableContent=null), ArticleFig(id=1241400386544792365, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图1, caption=
7050试验试样, figureFileSmall=raNXtAFnuwm7A07R0/fTsw==, figureFileBig=pWvyNYVsaEWVvJaprTk9cA==, tableContent=null), ArticleFig(id=1241400386666427190, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.2, caption=
Uniaxial tensile creep curves of 7050 aluminum alloy at 150 ℃ and 200 ℃, figureFileSmall=xUl1D7hydTTYAprLaX/Pkg==, figureFileBig=absEby4yb3hZYo5sdFl0hA==, tableContent=null), ArticleFig(id=1241400386746118975, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图2, caption=
7050铝合金在150、200 ℃温度下单轴拉伸蠕变曲线, figureFileSmall=xUl1D7hydTTYAprLaX/Pkg==, figureFileBig=absEby4yb3hZYo5sdFl0hA==, tableContent=null), ArticleFig(id=1241400386834199367, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.3, caption=
Creep rate curves of 7050 aluminum alloy at 150 ℃ and 200 ℃, figureFileSmall=b8029r9JrFs1m9HFKSh4KQ==, figureFileBig=9rUU9GnjPXCWiGD9AJUbhQ==, tableContent=null), ArticleFig(id=1241400386922279758, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图3, caption=
7050铝合金在150、200 ℃下蠕变速率曲线, figureFileSmall=b8029r9JrFs1m9HFKSh4KQ==, figureFileBig=9rUU9GnjPXCWiGD9AJUbhQ==, tableContent=null), ArticleFig(id=1241400387035525974, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.4, caption=
Coarse phase in 7050 alloy structure, figureFileSmall=3bx+BOHZhE6vwUFiYmTUJA==, figureFileBig=/A15wxFJqlRnSi9JMYSIUQ==, tableContent=null), ArticleFig(id=1241400387127800667, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图4, caption=
7050合金组织中的粗大相, figureFileSmall=3bx+BOHZhE6vwUFiYmTUJA==, figureFileBig=/A15wxFJqlRnSi9JMYSIUQ==, tableContent=null), ArticleFig(id=1241400387228463967, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.5, caption=
Change of dislocation density, figureFileSmall=kba6mHytv5wLFI7SoEUfNg==, figureFileBig=4e+aoEYvMeTRaQPB5MSvbA==, tableContent=null), ArticleFig(id=1241400387308155749, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图5, caption=
位错密度变化, figureFileSmall=kba6mHytv5wLFI7SoEUfNg==, figureFileBig=4e+aoEYvMeTRaQPB5MSvbA==, tableContent=null), ArticleFig(id=1241400387408819051, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.6, caption=
Comparison of SEM images of the creep fracture of 7050 aluminum alloy at 150 ℃ and different stress levels, figureFileSmall=NKU6sl/g8Qp1QaW0l4AzHw==, figureFileBig=3bPhXgUgeCQgk/lZm/h5mA==, tableContent=null), ArticleFig(id=1241400387492705136, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图6, caption=
150 ℃不同应力水平下7050铝合金蠕变断裂的扫描电镜图像比较, figureFileSmall=NKU6sl/g8Qp1QaW0l4AzHw==, figureFileBig=3bPhXgUgeCQgk/lZm/h5mA==, tableContent=null), ArticleFig(id=1241400387589174136, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.7, caption=
Comparison of SEM images of the creep fracture of 7050 aluminum alloy at 200 ℃ and different stress levels, figureFileSmall=6U8/ro//Q4XDaYcQLoHP8g==, figureFileBig=aJLFvAIZ/KnjNBF7sazxbg==, tableContent=null), ArticleFig(id=1241400387668865917, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图7, caption=
200 ℃不同应力水平下7050铝合金蠕变断裂的扫描电镜图像比较, figureFileSmall=6U8/ro//Q4XDaYcQLoHP8g==, figureFileBig=aJLFvAIZ/KnjNBF7sazxbg==, tableContent=null), ArticleFig(id=1241400387773723522, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.8, caption=
Average area of microvoids at initial and fracture stages under different stresses, figureFileSmall=6YGtuD/9mUL+L2J0tOvt4A==, figureFileBig=A/XHOyyo2WLAK0C/mQSalA==, tableContent=null), ArticleFig(id=1241400387907941260, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图8, caption=
不同应力下微孔洞初始和断裂时平均面积, figureFileSmall=6YGtuD/9mUL+L2J0tOvt4A==, figureFileBig=A/XHOyyo2WLAK0C/mQSalA==, tableContent=null), ArticleFig(id=1241400388012798864, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.9, caption=
Comparison of test and predicted values of 7050 aluminum alloy at 150 ℃ and 250 MPa, figureFileSmall=/V/nP/C0Q6oVx2sY19tYTA==, figureFileBig=oEHSxBOfRGbO95xvx3PI9g==, tableContent=null), ArticleFig(id=1241400388134433685, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图9, caption=
7050铝合金在150 ℃、250 MPa条件下试验和预测值比较, figureFileSmall=/V/nP/C0Q6oVx2sY19tYTA==, figureFileBig=oEHSxBOfRGbO95xvx3PI9g==, tableContent=null), ArticleFig(id=1241400388256068506, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Fig.10, caption=
Comparison of test creep curves and CDM predictions of 7050 aluminum alloy under different stress conditions at 150, 200 ℃, figureFileSmall=qdn7Mhssn42vItIbJvxXiA==, figureFileBig=Sw7NwBt9iMvCeVic9K3bRQ==, tableContent=null), ArticleFig(id=1241400388386091936, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=图10, caption=
7050铝合金在150、200 ℃下,不同应力条件下蠕变曲线的试验和CDM预测对比, figureFileSmall=qdn7Mhssn42vItIbJvxXiA==, figureFileBig=Sw7NwBt9iMvCeVic9K3bRQ==, tableContent=null), ArticleFig(id=1241400388474172325, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Tab.1, caption=
Main chemical components of commercial 7050 aluminum alloy
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| Zn | Mg | Cu | Zr | Si | Fe | Ti | Mn | Al |
|---|
| 5.93 | 1.91 | 2.45 | 0.11 | 0.05 | 0.14 | 0.03 | 0.01 | 余量 Bal. |
), ArticleFig(id=1241400388583224235, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=表1, caption=
商用7050铝合金的主要化学成分
, figureFileSmall=null, figureFileBig=null, tableContent=
| Zn | Mg | Cu | Zr | Si | Fe | Ti | Mn | Al |
|---|
| 5.93 | 1.91 | 2.45 | 0.11 | 0.05 | 0.14 | 0.03 | 0.01 | 余量 Bal. |
), ArticleFig(id=1241400388742607791, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Tab.2, caption=
Creep test parameters of 7050 aluminum alloy
, figureFileSmall=null, figureFileBig=null, tableContent=
蠕变温度 Creep temperature/℃ | 应力 Stress/MPa |
|---|
| 150 | 230 | 250 | 270 |
| 200 | 100 | 110 | 120 |
), ArticleFig(id=1241400388855854003, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=表2, caption=
7050铝合金蠕变试验参数
, figureFileSmall=null, figureFileBig=null, tableContent=
蠕变温度 Creep temperature/℃ | 应力 Stress/MPa |
|---|
| 150 | 230 | 250 | 270 |
| 200 | 100 | 110 | 120 |
), ArticleFig(id=1241400388981683130, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=EN, label=Tab.3, caption=
CDM final parameters of 7050 aluminum alloy under different temperature conditions
, figureFileSmall=null, figureFileBig=null, tableContent=
参数 Parameter | 值Value |
|---|
| 150 ℃ | 200 ℃ |
|---|
| A/s-1 | 9.0×10-12 | 1.42×10-10 |
| K1/MPa | 2.69×104 | 2.69×104 |
| K2/MPa | 32 | 32 |
| B1/h-1 | 230 | 230 |
| B2/h-1 | 6.59 | 6.59 |
| m | 1.44 | 1.44 |
| H* | 0.29 | 0.29 |
| C | 18.5 | 9.8 |
| d0/nm | 5.014 2 | 5.014 2 |
| Kr/(m3/s1) | 7.72×10-31 | 1.25×10-30 |
| D | 1(230 MPa) 1.12(250 MPa) 1.20(270 MPa) | 1(100 MPa) 1.46(110 MPa) 1.62(120 MPa) |
), ArticleFig(id=1241400389094929343, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394834733322471, language=CN, label=表3, caption=
7050铝合金不同温度条件下CDM最终参数
, figureFileSmall=null, figureFileBig=null, tableContent=
参数 Parameter | 值Value |
|---|
| 150 ℃ | 200 ℃ |
|---|
| A/s-1 | 9.0×10-12 | 1.42×10-10 |
| K1/MPa | 2.69×104 | 2.69×104 |
| K2/MPa | 32 | 32 |
| B1/h-1 | 230 | 230 |
| B2/h-1 | 6.59 | 6.59 |
| m | 1.44 | 1.44 |
| H* | 0.29 | 0.29 |
| C | 18.5 | 9.8 |
| d0/nm | 5.014 2 | 5.014 2 |
| Kr/(m3/s1) | 7.72×10-31 | 1.25×10-30 |
| D | 1(230 MPa) 1.12(250 MPa) 1.20(270 MPa) | 1(100 MPa) 1.46(110 MPa) 1.62(120 MPa) |
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