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Xiang C.,Suzhou Institute Ltd for Nonferrous Metals | Xiang C.,Shanghai JiaoTong University | Li H.,Suzhou Institute Ltd for Nonferrous Metals | Chen Z.,Suzhou Institute Ltd for Nonferrous Metals | Zhang X.,Suzhou Institute Ltd for Nonferrous Metals
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2016

The effect of 0.1 wt% zirconium addition on the spinodal decomposition and discontinuous precipitation of Cu-4Ti alloy was studied. Microstructure was investigated by optical microscope (OM) and transmission electron microscope (TEM). Mechanical properties and electrical conductivity (EC) were tested. The results show that spinodal decomposition process is retarded and discontinuous precipitation is suppressed by 0.1 wt% zirconium addition in the Cu-4Ti alloys, because of the hindering of zirconium to titanium's diffusion. Zirconium elevates the properties of this alloy on peak aging at 450℃ for 7 h. The zirconium has little influence on electrical conductivity of the Cu-4Ti-0.1Zr alloy. The tensile strength is 1155 MPa, HV microhardness is 3.3 GPa and the electrical conductivity is 15.4% IACS. © 2016, Science Press. All right reserved. Source


Xiang C.,Shanghai JiaoTong University | Xiang C.,Suzhou Institute Ltd for Nonferrous Metals | Li H.,Suzhou Institute Ltd for Nonferrous Metals | Zhu S.,Ningbo Changzhen Copper Co. | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

Based on the refinement and modification treatment of reclaimed brass melted straight by copper scrap, the research status of the covering agent, refining agent and modifiers for reclaimed brass, especially for reclaimed leaded brass, were summarized. The result shows that effective covering agent and refining agent for reclaimed leaded brass are absent recently, while the main modifiers are B, Ti, Zr, B-Ti-Zr composite modifier, RE, Ca, P, et al. The fluxes for reclaimed leaded brass were also prospected. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source


Han Y.,Suzhou Institute Ltd for Nonferrous Metals | Han Y.,Central South University | Li L.,Suzhou Institute Ltd for Nonferrous Metals | Mu S.,Suzhou Institute Ltd for Nonferrous Metals | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2010

Microstructure evolution and phase constituent of as-cast and homogenized Al-9. 1Zn-1.9Mg1.6Cu alloy were investigated by means of optical microscope (OM), SEM ( scanning electron microscope), EDS (energy dispersive spectrometer) and XRD(X-ray diffraction) and DSC (differential scanning calorimeter). The results reveal that a lot of nonequilibrium low-melting eutectic phase exist in the ascast microstructure of the alloy, and initial melting temperature reaches 475°C. As-cast microstructure is composed of a-Al phase, η-MgZn 2 phase and minor Al7Cu2Fe phase. The alloy is totally composed of α-rAl phase after homogenized at above 460°C , which shows that the non-equilibrium low-melting eutectic phase can dissolve into the matrix entirely. Desirable effects of the alloy can be observed with homogenizing at 465°C for 24 hours. Source


Han Y.,Suzhou Institute Ltd for Nonferrous Metals | Han Y.,Central South University | Li L.,Suzhou Institute Ltd for Nonferrous Metals | Deng Z.-Z.,Suzhou Institute Ltd for Nonferrous Metals | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2011

The solidification paths of Al-Zn-Mg-Cu alloy and variation of MgZn2, Al2CuMg, Al2Cu, Al2Mg3Zn3 phases amount and crystallization temperatures with Zn, Mg and Cu contents were studied by thermodynamic calculation software Jmat-Pro. The microstructures of the experimental alloy were analyzed, which show that the microstructural analysis is in agreement with the thermodynamic prediction. The thermodynamic calculation results indicate that, in the mass fraction ranges of Zn of 6.4-6.9%, Mg of 2.3%-2.5%, Cu of 2.0-2.2%, the content of MgZn2 phase can be up to 4.5%-6.0% and that of Al2CuMg phase can be lower than 0.5% during the constituent optimization of 7150 alloy. Source


Han Y.,Suzhou Institute Ltd for Nonferrous Metals | Han Y.,Central South University | Deng Z.-Z.,Suzhou Institute Ltd for Nonferrous Metals | Li L.,Suzhou Institute Ltd for Nonferrous Metals | And 2 more authors.
Zhuzao/Foundry | Year: 2010

Effects of different Er content on the structure and properties of Al-Zn-Mg-Cu alloy were studied with optical microscope, scanning electron microscope, microhardness test and tensile properties measurement. Results show that the secondary dendritic arm spacing decreased and dendritic areas became thinner after addition of rare earth Er. In Al-Zn-Mg-Cu alloy, the Er mainly exists at the grain boundary as Al 8Cu 4Er phase, and a small quantity of it as solid solution in a -Al. Moreover, Ercan restrain the recrystallization behaviour of Al-Zn-Mg-Cu alloy, refine recrystallization grain and improve the effects of ageing strengthening. When the content of Er was up to 0.3%, the strength and ductibility was obviously reduced as the result of the formation of eutectic Al 8Cu 4Er compound. Source

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