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11.
不同热处理态2024铝合金的腐蚀行为 总被引:1,自引:0,他引:1
分别在3.5%NaCl溶液、3.5%NaCl+1.0%H2O2溶液和pH=12的3.5%NaCl溶液中进行动电位极化实验,研究2024 Al-Cu-Mg合金在不同热处理状态下的腐蚀行为。极化曲线表明,随着合金时效时间的延长,合金的腐蚀电位向负方向移动;向NaCl溶液中添加H2O2会使腐蚀电位正移;在pH=12的3.5%NaCl溶液中的极化曲线表现出明显的钝化现象。腐蚀试样表面表现为常见的腐蚀特征,但也有扩大的点蚀、晶间腐蚀现象出现。循环动电位极化曲线显示有宽的循环极化滞后环,不同的腐蚀模式表明合金的点蚀生长对合金的热处理状态敏感。通过显微组织分析,探讨了不同热处理状态下合金在不同NaCl溶液中的腐蚀机理。 相似文献
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Texture Profile Method 总被引:5,自引:0,他引:5
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M. T. MILAN W. W. BOSE FILHO C. O. F. T. RUCKERT J. R. TARPANI 《Fatigue & Fracture of Engineering Materials & Structures》2008,31(7):526-538
The fatigue crack growth properties of friction stir welded joints of 2024‐T3 aluminium alloy have been studied under constant load amplitude (increasing‐ΔK), with special emphasis on the residual stress (inverse weight function) effects on longitudinal and transverse crack growth rate predictions (Glinka's method). In general, welded joints were more resistant to longitudinally growing fatigue cracks than the parent material at threshold ΔK values, when beneficial thermal residual stresses decelerated crack growth rate, while the opposite behaviour was observed next to KC instability, basically due to monotonic fracture modes intercepting fatigue crack growth in weld microstructures. As a result, fatigue crack growth rate (FCGR) predictions were conservative at lower propagation rates and non‐conservative for faster cracks. Regarding transverse cracks, intense compressive residual stresses rendered welded plates more fatigue resistant than neat parent plate. However, once the crack tip entered the more brittle weld region substantial acceleration of FCGR occurred due to operative monotonic tensile modes of fracture, leading to non‐conservative crack growth rate predictions next to KC instability. At threshold ΔK values non‐conservative predictions values resulted from residual stress relaxation. Improvements on predicted FCGR values were strongly dependent on how the progressive plastic relaxation of the residual stress field was considered. 相似文献
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Mental representations of spatial language 总被引:1,自引:0,他引:1
GEOFFREY S. HUBONA STEPHANIE EVERETT ELAINE MARSH KENNETH WAUCHOPE 《International journal of human-computer studies》1998,48(6):705-728
Previous studies have provided evidence of multi-level mental representations of language-conveyed spatial (scenic) information. However, the available evidence is largely inconclusive with regard to the structure of these mental representations. A laboratory experiment assesses computer-assisted problem-solving performance abilities when language-conveyed representations of spatial information are matched with the language perspective of the task and with individual cognitive skills. Our findings largely validate this paradigm of “cognitive fit” that has been applied in non-language computer display domains, and the results suggest language-fostered “perspective-bias” in the formation and use of mental representations of spatial (scenic) information. 相似文献
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PAUL J. PINTER Jr. RAY D. JACKSON C. ELAINE EZRA HAROLD W. GAUSMAN 《International journal of remote sensing》2013,34(12):1813-1825
Canopy spectral reflectances were measured over six cultivars of spring wheat (Trticum aestivum L.) grown at Phoenix, Arizona. Data were collected at 30-45 min intervals on 9 March 1983 using two ground-based radiometers with bandpass characteristics similar to those of the Muttispectral Scanner and Thematic Mapper on LANDSAT-4 and -5. Major differences in reflectance were observed among cultivars at every time period despite their apparent similarities in green leaf area and green biomass. Single-leaf spectra measured in the laboratory with a spectrophotometer revealed no cultivar-related differences and supported the contention that the reflectances were strongly influenced by canopy architectural features. The diurnal patterns of reflectance reinforced this conclusion with planophile canopies exhibiting the least amount of variability due to changes in Sun angle and erectophile canopies showing the most. These data underscore the complexities of interpreting remotely sensed multispectral data and suggest that multiple Sun-angle data acquisitions may be required to extract desired information. 相似文献
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Bimodal Heat Stability Curves of Fungal Pectolytic Enzymes and Their Implication for Softening of Canned Apricots 总被引:1,自引:0,他引:1
Pectolytic activity can be isolated from canned apricots showing severe softening induced by a single fungal lesion. The pectolytic activities of fungi important in causing progressive softening have bimodal heat stability curves with minimal stabilities at 70–80°C. The activities produced by fungi that do not cause appreciable softening do not show bimodal stability curves. A 6-min treatment at 75°C before carning eliminated detectable enzyme activity and significantly reduced subsequent softening in No. 303 cans of apricots to which single fruit halves with 5 mm fungal lesions had been added. These results suggest that a pretreatment at about 75°C could help alleviate this problem in canned apricots. 相似文献
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