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| 1 | Damage behavior of tungsten fiber-reinforced copper matrix composite after high-speed impact显示文摘Wf/Cu82Al10Fe4Ni4 composite was fabricated by means of infiltration casting. By the microstructure observation of the composite with the aid of scanning electron microscopy(SEM) and transmission electron microscopy(TEM), it can be found that there are(Fe, Ni),AlFe, Al3 Ni, and Cu3 Al precipitated phases existing in the matrix alloy. By two-stage light gas gun, Wf/Cu82Al10-Fe4Ni4 composite hypervelocity projectile into concrete target test with the speed of 2.2 kmás-1is finished. By microstructure observation, it can be found that the failure mode of Wf/Cu82Al10Fe4Ni4 composite projectile during penetration is the rapid peeling of tungsten fibers from the projectile, which makes the projectile display good selfsharpening property. Meanwhile, it can be found that microstructure morphology change of Wf/Cu82Al10Fe4Ni4 composite occurs after hypervelocity impact. The density of dislocations around the large-dimensional(Fe, Ni),AlFe, Al3 Ni, and Cu3 Al precipitated phases in the matrix alloy rises sharply. At the same time, there are largedimensional deformed twins existing in local regions and stacking faults existing inside the twins. | Zhe Wu Chun-Mei Yang Qian-Jun Liu Yan Ma | 2014 | Rare Metals2014，33，3： | 3 |
| 2 | Microstructural evolution and mechanical properties of in situ TiB_2/Al composites under high-intensity ultrasound显示文摘Microstructural evolution and mechanical properties of in situ TiB2/Al composites fabricated with exothermic reaction process under high-intensity ultrasound produced by the magnetostrictive transducer were investigated. In this method, the microstructure and grain refining performance of the TiB2/Al composites were characterized by optical morphology(OM), scanning electron microscopy(SEM), energy-dispersive spectrometer(EDS), and X-ray diffraction(XRD) analysis.Microstructural observations show a decreasing trend in the grain size of the composites due to the ultrasound and the content of TiB2 particles in the composites. Compared with the process without ultrasound, the morphology and agglomeration of TiB2 particles are improved by high-intensity ultrasound. Meanwhile, it is proposed that the formation of TiB2 particles occurs via the transformation from Ti Al3, and at the optimal amount of the reactants, the conversion efficiency of Ti Al3 into TiB2 almost reaches up to 100 %. Finally, the effects of high-intensity ultrasound and TiB2 particles on the mechanical properties of the TiB2/Al composites were also discussed. | Cun-Guang Chen Ji Luo Zhi-Meng Guo Wei-Wei Yang Jun Chen | 2015 | Rare Metals2015，34，3： | 2 |
| 3 | Deposition rate of hafnium crystal bar by iodide process显示文摘Single variable and deposition weight methods were adopted in the experiment. The hafnium crystal bar was fabricated by the iodide process. Influence of hafnium filament temperature(K value), temperature controlling method, types of feed, and the loading methods on the deposition rate were studied. The results show that the K value, temperature control method, types of feed, and the loading methods have obvious effects on the deposition rate of the hafnium crystal bar. The deposition rate increases with the K value rising in the range of certain temperature;the salt bath controlling temperature method could effectively obtain the better deposition rate; the greater the contact areas of the feeds are, the faster the deposition rate is.So, the optimal iodide deposition techniques of preparing hafnium crystal bar are as follows: hafnium turnings as feed,molybdenum feed retainer charging, salt bath temperature controlling under the higher K value. | Li-Sen Tian Yan-Xi Yin Zhi-Fang Hu Hong-Lin Jiang Zhong-Qi Li Li-Jun Wang | 2014 | Rare Metals2014，33，2： | 2 |
| 4 | Mechanical properties of tungsten heavy alloy and damage behaviors after hypervelocity impact显示文摘93W-4.5Ni-1.5Fe-1Co(W) was prepared by powder metallurgic method, and then dynamic mechanical properties of this material were tested at high temperature by means of high-temperature split Hopkinson pressure bar(SHPB). The results show that the material possesses highdynamic mechanical properties, significant temperature effects, and strain hardening behaviors. Used two-stage light gas gun, the penetration test of 93 W projectile was finished. After the completion of the test, through the microstructure observation of the residual 93 W projectiles with the aid of scanning electron microscopy(SEM) and transmission electron microscopy(TEM), it can be found that there are obvious signs of hot melt existing on the surface of the projectile, a lot of adiabatic shear bands inside the projectile, and microcracks exist at the end of adiabatic shear bands. The test results show that adiabatic shear is the main form to cause the projectile failure and it is the emergence of the adiabatic shearing phenomenon that makes 93 W display good self-sharpening property in the process of hypervelocity penetration. At the same time,the results of TEM observation show that there are highdensity dislocations at the interface between W and Ni–Fe–Co-based alloy inside the 93 W. | Zhe Wu Yang Zhang Chun-Mei Yang Qian-Jun Liu | 2014 | Rare Metals2014，33，4： | 2 |
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