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The creep behavior of Mg-9Al-1Si-1SiC composite at elevated temperature 被引量:3
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作者 Pengwen Zhou Shaoxiong Zhang +6 位作者 Ming Li Hongxia Wang Weili Cheng Lifei Wang Hang Li Wei Liang Yiming Liu 《Journal of Magnesium and Alloys》 SCIE EI CAS 2020年第3期944-951,共8页
The creep properties of as-cast Mg-9Al-1Si alloy and Mg-9Al-1Si-1SiC composite were compared.The results show that Mg-9A1-lSi-lSiC composite performs a better creep resistance than that of Mg-9Al-1Si alloy at constant... The creep properties of as-cast Mg-9Al-1Si alloy and Mg-9Al-1Si-1SiC composite were compared.The results show that Mg-9A1-lSi-lSiC composite performs a better creep resistance than that of Mg-9Al-1Si alloy at constant temperature and stress(473 K,70MPa).Besides,the creep behavior of Mg-9Al-1 Si-1SiC composite at various temperature from 448 K to 498 K and under stresses of 70-90 MPa were systematically investigated.The Mg-9Al-1 Si-1SiC composite exhibited a stress exponent from 5.5 to 6.9 and the creep activation energy fell within the range of 86-111 kJ/mol.The results showed that the creep mechanism of Mg-9Al-1Si-1SiC composite was mainly attributed to the effects of secondary phase strengthening mechanism and dislocation climb mechanism. 展开更多
关键词 MICROSTRUCTURE Stress exponent n creep activation energy Q Mg-9Al-1Si-1SiC composite
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Correct Interpretation of Creep Rates: A Case Study of Cu
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作者 W.Blum J.Dvoák +2 位作者 P.Král P.Eisenlohr V.Sklenika 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2015年第11期1065-1068,共4页
Traditionally the deformation resistance in creep is characterized by the minimum creep rate εmin and its sensitivity to stress (stress exponent n) and temperature (activation energy Q). Various values of constan... Traditionally the deformation resistance in creep is characterized by the minimum creep rate εmin and its sensitivity to stress (stress exponent n) and temperature (activation energy Q). Various values of constant n have been reported in the literature and interpreted in terms of specific mechanisms. The present case study of coarse-grained Cu at 573 K yields a stress exponent n = 9 for εmin. in tension and a relatively low activation energy. The evolution of the deformation resistance with strain at constant tensile creep load and comparison with creep in compression without fracture indicates that the tensile εmin. result from transition from uniform deformation to strain localization during fracture. This is confirmed by the results of creep in compression where fracture is suppressed. Both the tensile εmin, and the compressive creep rate at strains around 0.3 can be described using existing equations for quasi-stationary deformation containing the subgrain boundary misorientation θ as structure parameter. While in the latter case constant θ leads to monotonic increase of n with stress, the tensile nine-power-law results from variable θ, and has no simple meaning. The result of this case study means that uncritical interpretation of minimum tensile creep rates as stationary ones bears a high risk of systematic errors in the determination of creep parameters and identification of creep mechanisms. 展开更多
关键词 Cu creep Minimum creep rate activation energy Stress exponent
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