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LY12CZ材料激光辐照延寿的微观研究及损伤演变

邹鸿承 , 戴蜀娟 , 钱志雄 , 李光霞

金属学报

对激光辐照后Ly12 CZ铝合金的疲劳寿命明显提高的原因进行了微观研究。结果表明位错胞尺寸λ在疲劳失效时都趋向于一常量λ_c。结合损伤力学建立了该材料的疲劳损伤判据及损伤演变过程,分别为: D_c=1-(λ_c/λ_0)~P D=1-{1-[1-(λ_c/λ_0)~(P(1+γ))](N/N_f)}~(1/(1+γ)

关键词: 激光辐照 , dislocation cell , fatigue , damage mechanics

IMPROVEMENT ON FATIGUE LIFE OF ALLOY LY12CZ AFTER LASER RADIATION AND ITS DAMAGE EVOLUTION

ZO U Hongcheng DAI Shujuan QIAN Zhixiong LI Guangxia Huazhong University of Science and Technology , Wuhan , China [Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp A207—A212 , Associate Professor , Division of Materials , Huazhong University of Science and Technology , Wuhan , China

金属学报(英文版)

The change of microstructure of fatigue specimens before and after laser radiation was studied by transmission electron microscopy.The results show that the diameter of dislocation cell λ tends to a constant at fatigue failure.Based on the principles of continuous damage mechanics,expressions of the fatigue damage criterion and processes of fatigue damage evolu- tion for L Y12CZ have been derived.

关键词: laser radiation , null , null , null

DEFORMATION AND STRENGTHENING OF COLD-DRAWN STEEL WIRES

SHI Deke LIU Junhai HAO Hongqi Xi'an Jiaotong University , Xi'an , China

金属学报(英文版)

It was shown by the study of TEM that the fine lamellar pearlite becomes a ductile phase dur- ing cold drawing.There exist many ledges to emit dislocations at Fe_3C/Fe interface.It is one of the reasons that high density of dislocations emerges at the Fe_3C/Fe interface. Furthermore,there are some evidences to support that dislocation cuts through Fe_3C.There- fore,it is necessary to consider the contribution of cementite being sheared strengthening.

关键词: cold-drawn steel wire , null , null

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