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| 1 | Characterization of high-pressure die-cast hypereutectic Al-Si alloys based on microstructural distribution and fracture morphology显示文摘The fracture behavior of high-pressure die-cast hypereutectic(HPDC) Al-Si alloys was investigated using a high-resolution laboratory CT and synchrotron X-ray tomography with a particular focus on the influence of HPDC microstructure. Results showed that microstructure of the alloy was mainly comprised of primary silicon particles(PSPs), Al dendrites, Cu-rich phases and pores. Most of the coarse PSPs, Cu-rich phases and pores were located in the center of the specimen. The rapid solidification of HPDC led to a heterogeneous microstructural feature. Elemental Cu was enriched in the frontiers of solid-liquid interface, causing the formation of large size dendritic arms. The pores were formed in the interdendrites which endured high stress intensity under high applied stress. Microcracks were originated from pores and further connected Cu-rich phases causing intergranular fracture. PSPs worked as obstacles causing piling-up dislocations in the phase interface. In the regions where large size of PSPs enriched in, PSPs ruptured rather than debonded from matrix, indicating transgranular fractures of PSPs. Microcracks originated around pores and PSPs tended to converge on the main cracks to decrease the energy required for crack propagation. | X.Y. Jiao J. Wang C.F. Liu Z.P. Guo G.D. Tong S.L. Ma Y. Bi Y.F. Zhang S.M. Xiong | 2019 | Journal of Materials Science & Technology2019，35，6： | 3 |
| 2 | Photoelectrical and charge transfer properties of hydrogen-evolving TiO 2 nanotube arrays electrodes annealed in different gases显示文摘 | L.X. Sang Z.Y. Zhang C.F. Ma | 2011 | International Journal of Hydrogen Energy2011，，8： | 1 |
| 3 | Measurement of Monochromatic Emissivity of Cement Clinker with Various Fe_2O_3 Content at High Temperature显示文摘MeasurementofMonochromaticEmissivityofCementClinkerwithVariousFe_2O_3ContentatHighTemperatureZ.J.Ye;C.F.Ma;S.Y.Huang(BeijingP... | Z.J. Ye C.F. Ma S.Y. Huang(Beijing Polytechnic University, Beijing 100022, China) | 1996 | Journal of Thermal Science1996，5，2： | 0 |
| 4 | Fuel Economy Opportunities for Internal CombustionEngines by Means of Oil-Cooling显示文摘Comparative experiments of oil and water-cooling were performed on a 4-cylinder automotive gasoline engine and a single-cylinder direct injection Diesel engine. Measurements were made to investigate the variation of fuel consumption, combustor wall temperature and engine emissions (HC, CO, NOx and smoke) with two cooling media at steady-state conditions. Significant improvement of fuel economy was found mainly at partial load conditions with oil-cooling in comparison with the baseline waer-cooling both for the two engines. The experimental results also showed general trend of reduction in engine emissions using oil as the coolant. Measurements of wall temperature demonstrated that oil-cooling resulted in considerable increase of the combustor wall temperature and reduce of warmup period in starting process. For automotive gasoline engine, road tests indicated the same trend of fUel economy improvement with oil-cooling. The performance of the automotive oil-cooled engine was fUrther improved by internal cooling with water or methanol injection. | C.F. Ma J.C. Li W.X. Qin Z.Y. Wei J. Chen (Department of Thermal Science and Engineering, Beijing Polytechnic University Beijing 100022,China) | 1997 | Journal of Thermal Science1997，6，2： | 0 |
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