期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 110, 期 -, 页码 130-143出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2018.01.018
关键词
Rolling; Al alloy; Strain amplitude; Low cycle fatigue; Ultrafine grains
In the present work, ultrafine grained Al 6082 alloy was produced by cryorolling (CR), room temperature rolling (RTR), CR + annealing (CR + AN) at 200 degrees C and RTR + annealing (RTN + AN) at 200 degrees C processes to study the effects of metallurgical factors (ultrafine grain structure, precipitates and secondary phase particles) on its low cycle fatigue behavior. Various characterization techniques such as the transmission electron microscopy, electron back scattered diffraction, scanning electron microscopy and differential scanning calorimetry were used to investigate the low cycle fatigue (LCF) behavior of the 6082 Al alloy. It was observed that the sample produced via CR + AN exhibits the highest LCF life when compared to the other samples investigated. The improvement in the LCF life of the 6082 Al alloy after CR + AN is attributed to the presence of small sized Si-rich precipitates, secondary phase particles, sub grains formation (200-400 nm) and high stored energy (32.16 x 10(-4) J/mol).
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