Advanced Characterization of the Cyclic Deformation and Damage Behavior of Al-Si-Mg Cast Alloys Using Hysteresis Analysis and Alternating Current Potential Drop Method
Advanced Characterization of the Cyclic Deformation and Damage Behavior of Al-Si-Mg Cast Alloys Using Hysteresis Analysis and Alternating Current Potential Drop Method
复制标题
使用磁滞分析和交流电势降法对 Al-Si-Mg 铸造合金的循环变形和损伤行为进行高级表征
DOI：
10.1007/978-3-030-05864-7_23
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Walther
中科院分区：
文献类型：
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作者：
Tenkamp;Bleicher;S. Chrzan;Walther
汽车和航空航天工业对轻质和耐疲劳解决方案的需求需要广泛使用轻金属，如Al-Si-Mg铝铸造合金。为了确保疲劳加载铝铸造部件的安全设计，必须了解α-Al枝晶的微观结构特征（例如枝晶臂间距、显微硬度）和枝晶间Al-Si共晶（例如Si共晶形态）、应力-应变行为和疲劳寿命（包括裂纹萌生的循环次数和裂纹扩展行为）之间的关系。为此，对铸造铝合金EN AC-AlSi 7 Mg 0.3进行了1 E2 ~ 1 E7循环的低周疲劳和高周疲劳试验。在此基础上，通过拉伸、步进拉伸和恒幅拉伸试验，研究了α-Al显微硬度和Si共晶形貌对低周疲劳单调和循环应力-应变行为的影响。此外，使用在线滞后分析和用于监测变形和损伤演变的交流电位降（ACPD）方法，在HCF制度中确定直到1 E7的微观结构特异性S-N曲线。据此，计算机断层扫描（CT）分析被用来评估损伤状态间歇性和事后在CAT。因此，ACPD方法可以被验证为一个敏感和可靠的技术定量表征的应力和周期依赖的变形和损伤行为，包括循环硬化，软化和饱和，以及裂纹萌生和扩展，直到失败。
The demand for lightweight and fatigue-resistant solutions in the automotive and aerospace industries requires the extensive use of light metals like Al -Si-Mg aluminum cast alloys. To ensure a safe design for fatigue-loaded aluminum cast components, the relation between microstructure characteristics of α-Al dendrites (e.g. dendrite arm spacing, microhardness ) and interdendritic Al -Si eutectic (e.g. Si eutectic morphology ), stress-strain behavior and fatigue lifetime including the number of cycles to crack initiation and crack propagation behavior has to be understood. For this purpose, fatigue tests in the LCF and HCF regime from 1E2 to 1E7 cycles were performed for aluminum cast alloy EN AC-AlSi7Mg0.3. With this, the effect of α-Al microhardness and Si eutectic morphology was investigated on monotonic and cyclic stress-strain behavior by performing tensile , incremental step (IST) and constant amplitude tests (CAT) in the LCF regime. Moreover, microstructure -specific S-N curves were determined in the HCF regime until 1E7 using online hysteresis analysis and alternating current potential drop (ACPD) method for monitoring the deformation and damage evolution. Hereby, computed tomography (CT) analyses were used to evaluate the damage state intermittent and post-mortem in CAT. As a result, ACPD method could be validated as a sensitive and reliable technique for quantitative characterization of stress- and cycle-dependent deformation and damage behavior including cyclic hardening, softening and saturation as well as crack initiation and propagation until failure.
金属的自我形成
DOI：
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发表时间：
1991
期刊：
影响因子：
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作者：
H. Christ
通讯作者：
H. Christ
DOI：
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发表时间：
2017
期刊：
影响因子：
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作者：
H. Richard;Britta Schramm;Thomas Zipsner
通讯作者：
Thomas Zipsner
显微组织对亚共晶 Al-Si-Mg 铸造合金循环应力应变行为和疲劳寿命的影响
DOI：
10.1051/matecconf/201816515004
发表时间：
2018
期刊：
影响因子：
--
作者：
Tenkamp;Knorre;Michels;Walther
通讯作者：
Walther