| Fracture behaviors of AZ80 magnesium alloy during multiple forging processes |
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| 作者姓名： | 郭强 严红革 陈振华 张辉 |
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| 作者单位： | School of Materials Science and Engineering Hunan University Changsha 410082 China，School of Materials Science and Engineering Hunan University Changsha 410082 China，School of Materials Science and Engineering Hunan University Changsha 410082 China，School of Materials Science and Engineering Hunan University Changsha 410082 China |
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| 基金项目： | Project（04GK1008-1） supported by the Major Program of Science and Technology of Hunan Province; Project（03JKY1016） supported by the Key Program of Science and Technology of Hunan Province |
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| 摘 要： | 1 Introduction Pure magnesium and magnesium alloys are the lowest density metals used as structural materials and have excellent specific strength and stiffness, machinability, dimensional stability, and excellent recycling capability. They are, therefor…
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| 关 键 词： | AZ80合金 镁合金 裂纹 热加工 |
| 收稿时间： | 2005-10-20 |
| 修稿时间： | 2006-03-20 |
Fracture behaviors of AZ80 magnesium alloy during multiple forging processes |
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| GUO Qiang,YAN Hong-ge,CHEN Zhen-hua,ZHANG Hui.Fracture behaviors of AZ80 magnesium alloy during multiple forging processes[J].Transactions of Nonferrous Metals Society of China,2006,16(4):922-926. |
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| Authors: | GUO Qiang YAN Hong-ge CHEN Zhen-hua ZHANG Hui |
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| Affiliation: | 1. Marine Corrosion and Protection Centre, Institute of Oceanology, Chinese Academy of Sciences, No. 7 Nanhai Road, Qingdao 266071, China;2. State Key Lab for Non-ferrous Metals and Process, General Research Institute for Non-Ferrous Metals, Beijing 100088, China |
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| Abstract: | The initiation, propagation and the accompanied dislocation structures of the cracks in AZ80 magnesium alloy during multiple forging processes were investigated. The results show that the cracks firstly initiate at the Mg/Mg17Al12 interface under the hoop tensile stress on equatorial free surface. On further deformation, the cracks in the Mg17Al12 particles tend to propagate along the grain boundaries(GBs) in a zigzag pattern and link with adjacent cracks in other Mg17Al12 particles to form one whole crack, leading to the fracture surface. Low deformation temperature and too many forging passes during the deformation will promote the nucleation of interfacial microcrack inside the specimens due to the strong plastic strain incompatibility and the high internal stresses near the GBs. The loading axis rotating during the process can change the stress field at the tip of cracks, leading to the change of the crack propagating path and assisting in inhabiting microcracking development. |
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| Keywords: | AZ80 magnesium alloy multiple forging cracks fracture behaviors |
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