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一种Al-Li-Zn-Zr合金在室温与低温下的反常拉伸断裂行为SCIEI
引用本文:蒋晓军,姚大平,李依依. 一种Al-Li-Zn-Zr合金在室温与低温下的反常拉伸断裂行为SCIEI[J]. 金属学报, 1991, 27(1): 39-43
作者姓名:蒋晓军  姚大平  李依依
作者单位:中国科学院金属研究所,中国科学院金属研究所,中国科学院金属研究所 博士生 沈阳110015
摘    要:本文研究了一种Al-Li-Zn-Zr合金从室温到77K范围内的拉伸性能与断裂行为,结果表明,随实验温度的降低,合金的拉伸极限强度与延伸率均提高,屈服强度基本不变;合金在室温时为明显的穿晶断裂,而77K则主要为沿晶断裂形式;断口附近室温及低温下的变形模式基本相同,但室温时断裂主要与平面滑移有关,而低温时平面滑移倾向大大减弱,此时合金的断裂与位错和晶界的交互作用有关。

关 键 词:Al-Li合金  拉伸  断裂  室温  低温  Al-Li alloy  tensile properties  fracture behaviour
收稿时间:1991-01-18
修稿时间:1991-01-18

ANOMALOUS TENSILE FRACTURE BEHAVIOUR OF AN Al-Li-Zn-Zr ALLOY AT ROOM TEMPERATURE AND UNDER LOW TEMPERATURES
JIANG Xiaojun,YAO Daping,LI Yiyi Institute of Metal Research,Academia Sinica,Shenyang. ANOMALOUS TENSILE FRACTURE BEHAVIOUR OF AN Al-Li-Zn-Zr ALLOY AT ROOM TEMPERATURE AND UNDER LOW TEMPERATURES[J]. Acta Metallurgica Sinica, 1991, 27(1): 39-43
Authors:JIANG Xiaojun  YAO Daping  LI Yiyi Institute of Metal Research  Academia Sinica  Shenyang
Abstract:The tensile properties and fracture behaviour of an Al-Li-Zn-Zr alloyhave been investigated in the temperature range of 295 to 77 K. The ultimatestrength and elongation increase with decreasing temperature, whereas the yieldstrength remains merely unchanged. Its fracture is transgranular obviously at roomtemperature, but it appears mainly as intergranular mode at 77 K. The deformationmode near the fracture surface is similar at both ambient and cryogenic tempera-tures. However, at room temperature, the ftacture of the alloy is mainly concernedwith the planar slipping, which may be weakened markedly at 77 K, and at thesame time, the fracture behaviour of the alloy is dependent on the interaction betweenslip bands and grain boundaries.
Keywords:Al-Li alloy  tensile properties  fracture behaviour  
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