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analyzed. It is shown that, when the applied stress is less than failure stress level, the creep deformation is not obvious, and its main form is steady-state creep. When applied stress level is greater than or less than but close to fracture stress, it is easier to see the increase of creep deformation and the more obvious accelerative creep characteristics. The circumferential creep deformation......
the creep temperature increases to 200 ℃, the creep stress is decreased by 45.8%. The main deformation mechanism of the alloy is intragranular slipping of the dislocations in the creep temperature range of 125-175 ℃. Grain boundary slidings happen in this alloy at the creep temperature of 200 ℃ and the deformation of this alloy is coordinated by intragranular slip and grain boundary sliding. Lots......
additional creep deformation because of softening, so additional creep loading around casing becomes bigger and bigger with time going on. When stratum stress is heterogeneous, creep loading is also... was finished. From Figs.5 and 6, it is obvious that under the same loading pressure, the creep deformation increases with the increase of water content. Fig.7 shows the correlation curves of steady state creep......
on the creep behavior, microstructural evolution, and precipitation of an Al-Cu-Li alloy was experimentally investigated during creep ageing deformation under 180 MPa for 20 h. Increasing temperature... on the microstructural evolution of the AA2198 during creep ageing deformation. Many larger dislocations and even tangled dislocation structures were observed in the sample aged at higher temperature. The number of T1......
was utilized to analyze the microalloying effect of Cu on the creep behavior of CoFe-based metallic glasses at different loading rates. The defect activation during creep deformation was detected... with the decrease of viscosity. Our work provides a microscopic insight into structural evolution during creep deformation in a Cu-doped metallic glass, which might help for understanding the plastic deformation......
. After exposed at 600 ℃ for 100 h with the stress of 150 MPa, the residual deformation is not excess 0.1% for the alloy thermal treated at the five conditions mentioned in this paper. The best creep... Tensile and creep properties of Ti-600 alloy ZENG Li-ying(曾立英)1, 2, HONG Quan(洪权)1, YANG Guan-jun(杨冠军)2, ZHAO Yong-qing(赵永庆)1, QI Yun-lian(戚运莲)1, GUO Ping(郭萍)1 1. Northwest Institute......
Evolution of dislocation cells during plastic deformation ZHOU Zhi-min(周志敏)1, SUN Yan-rui(孙艳蕊)1, ZHOU Hai-tao(周海涛)2 (1. College of Science, Northeastern University, Shenyang 110004, China; 2.... By using severe plastic deformation(SPD) techniques, materials with fine grain size as small as 200-250nm have been obtained. However, the nature of the grain boundaries has not been theoretically......
alloy; microstructure; creep deformation; Mg-Zn phase; dynamic precipitation ... morphology of second phases in magnesium alloys with a high zinc content. The morphology and chemical composition changes of intermetallic compounds taking place during creep deformation were also......
; and T is absolute temperature. Q and n are two important mechanical and thermodynamic parameters for describing the creep deformation of solders. Eq.(1) can be further simplified as ... the best-fit of exponent parameter n. Creep deformation mechanisms are identified by the values of the stress exponent n and the activation energy Q[21]. Dislocation creep occurs as a result......
