CYCLIC STRESS-STRAIN RESPONSE OF ZR-SN-NB ALLOY AT ELEVATED TEMPERATURES
The cyclic stress-strain response of Zr-Sn-Nb alloy is studied over a temperature range from 523K to 823K, by conducting incremental step tests using fully reversed tension-compression loading under total strain control at a constant strain rate of 1? 10<-3> S<-1>. The friction stress and the back stress, which are the two kinds of resistance to plastic deformation, are determined by the analysis of hysteresis loops. It is found that at all temperatures investigated, the cyclic peak stress and the back stress increase with increasing the strain amplitude, while the friction stress remains almost constant. Negative temperature dependence of both the cyclic peak stress and the friction stress is observed in the temperature range of 673K-773K, and serrations appear on the hysteresis loops at 723K, all of which are the manifestations of dynamic strain aging (DSA). The back stress decreases monotonically when the temperature increases. The mechanisms responsible for these phenomena are discussed.
Jun Tan Cong Li Chao Sun Shihao Ying
National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China,P. O. Box 4 National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, P. O. Box National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, P.O. Box 4
国际会议
上海
英文
343
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）