| 预形变和时效Al-2.73Li合金的断裂机制SCIEI |
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| 引用本文： | 孙东立,杨德庄,崔约贤,雷廷权.预形变和时效Al-2.73Li合金的断裂机制SCIEI[J].金属学报,1990,26(2):57-63. |
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| 作者姓名： | 孙东立 杨德庄 崔约贤 雷廷权 |
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| 作者单位： | 哈尔滨工业大学9系921教研室，哈尔滨工业大学，哈尔滨工业大学，哈尔滨工业大学 讲师，哈尔滨(150006) |
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| 摘 要： | 本文研究了预先冷形变对Al-2.73Li合金的机械性能和断裂行为的影响。试验结果表明,预先冷形变使合金的加工硬化率和强度提高,相应损失部分塑性。预先冷形变造成不均匀分布的胞状位错结构及晶界无沉淀带加工硬化,乃是导致塑性下降的主要原因。合金的断裂方式为沿晶和穿晶混合型。预形变后时效使沿晶断裂倾向增大。最后探讨了其断裂机制。
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| 关 键 词： | Al-Li合金 断裂 预形变 时效 塑性 |
| 收稿时间： | 1990-02-18 |
| 修稿时间： | 1990-02-18 |
FRACTURE MECHANISM OF PRE-DEFORMATION-AGED Al-2.73Li ALLOY |
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| SUN Dongli,YANG Dezhuang,CUI Yuexian,LEI Tingquan Harbin Institute of Technology Faculty,.FRACTURE MECHANISM OF PRE-DEFORMATION-AGED Al-2.73Li ALLOY[J].Acta Metallurgica Sinica,1990,26(2):57-63. |
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| Authors: | SUN Dongli YANG Dezhuang CUI Yuexian LEI Tingquan Harbin Institute of Technology Faculty |
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| Abstract: | The fracture mechanism of deformation-aged Al-Li alloy was approach-ed by investigating the influence of prior cold deformation on the precipitationkinetics as well as the behaviours of work hardening and fracture for Al-2.73 Lialloy. The experimemal results show that the work hardening rate and thestrength are increased and the ductility is decreased by prior cold defromation.The decrease in ductility is mainly due to the cell dislocation substructure distri-buted inhomogeneously and the hardening of precipitates free zones at grain bound-aries caused by prior cold deformation. The failure mode in the alloy is a mixedintergranular and transgranular fracture. The tendency of intergranular fracture isintensified through the deformation-aging. The mechanisms of intergranular failurein the alloy are different under various deformation-aging treatments |
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| Keywords: | Al-Li alloy deformation-aging precipitation strengthening fracture |
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