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Yan Y.B.,Nanjing University of Science and Technology | Zhang Z.W.,Nanjing University of Science and Technology | Zhang Z.W.,Auburn University | Shen W.,Auburn University | And 3 more authors.
Materials Science and Engineering A | Year: 2010

A composite plate of Mg alloy (AZ31B) and an Al alloy (7075) was fabricated by explosive welding. The microstructure and properties of the bonding interface after explosive cladding were investigated. The results show that the bonding interface had a wavy appearance with solidified melts in a regularly spaced pattern of discrete regions. Adiabatic shear bands and twin structure were found on the AZ31B Mg alloy side. "Metallurgical bonding" of the explosive welding interface was achieved by local diffusion with an approximate 3.5 μm thick diffusion layer. No intermetallics were formed. Shear strength across the bonding interface of AZ31B/7075 composite was ca. 70 MPa. The maximum bending stress reached 670 MPa. © 2009 Elsevier B.V. All rights reserved.


Zhang Y.,CAS Ningbo Institute of Material Technology and Engineering | Liu J.,CAS Ningbo Institute of Material Technology and Engineering | Zheng Q.,Ningbo University of Technology | Zheng Q.,China Academy of Ordnance Science | And 4 more authors.
Scripta Materialia | Year: 2014

The microstructure, magnetocaloric effect and mechanical properties of carbon-doped Ni43Mn46Sn11Cx (x = 0, 2, 4, 8) alloys have been investigated. The martensitic transformation temperatures increase remarkably, from 196 to 249 K, as the carbon doping content increases. A large magnetic entropy change, ΔSM, from 27.4 J kg-1 K-1 with x = 0 to 34.6 J kg-1 K-1 with x = 2, was obtained for a field change of 5 T. A significant enhancement of compressive strength from 556 MPa with x = 0 up to 1016 MPa with x = 8 is ascribed to the appearance of high amount of carbides. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


Wang J.,Beijing Institute of Technology | Qian J.,Beijing Institute of Technology | Zhang X.,Beijing Institute of Technology | Wang Y.,China Academy of Ordnance Science
Rare Metals | Year: 2011

With the development of science and technology, comprehensive performance of high temperature structural materials were demanded urgently. In this paper, the Ni 3Al and NiAl high temperature structural materials were summarized. Various properties of Ni 3Al and NiAl were briefly discussed. As well as, various preparations of intermetallics compounds were retrospected. Ni 3Al and NiAl alloys have good performance such as high melting point, excellent oxidizability resistance under high temperature, moderate density, outstanding heat and electrical conductivity, which were considered as the outlook high temperature structural materials at the present and become emphasis which were exploited and researched. © The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2011.


Fu Y.,Harbin Engineering University | Yan F.,Harbin Engineering University | Zhu X.,Harbin Engineering University | Feng X.,Harbin Engineering University | Guo Z.,China Academy of Ordnance Science
Modern Physics Letters B | Year: 2016

The paper was presented to study the microstructure and magnetic properties of Mo/[NdFeB/Mo] × 10/Mo multilayered films prepared by magnetron sputtering on Si(100) substrate. The SEM observation of microstructure showed that the specimen had fine multilayer structure and the NdFeB layers were successfully separated by Mo layers on the cross-section. The interface between the NdFeB and Mo layer disappeared after annealing. X-ray diffraction patterns of the annealed films revealed that there are a large amount of Nd2Fe14B phases. The thickness of Mo layer had obvious effects on magnetic properties of the samples. When it reached 21 nm, the number and the intensity of NdFeB phase increase, and the remanent magnetization ratio Mr/Ms suddenly rise. The influences of annealing on surface morphology and microstructure of NdFeB thin films were also studied. © 2016 World Scientific Publishing Company.


Hu Q.,Northwestern Polytechnical University | Hu Q.,China Academy of Ordnance Science | Liu L.,Northwestern Polytechnical University | Zhao X.-B.,Northwestern Polytechnical University | And 3 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2013

The phase transformation temperature, segregation behavior of elements and as-cast microstructure were investigated in experimental nickel-base superalloys with different levels of carbon and boron. The results show that the liquidus temperature decreases gradually but the carbide solvus temperature increases obviously with increasing carbon addition. Minor boron addition to the alloy decreases the liquidus temperature, carbide solvus temperature and solidus temperature slightly. Apart from rhenium, the segregation coefficients of the elements alter insignificantly with the addition of carbon. The segregation behavior of rhenium, tungsten and tantalum become more severe with boron addition. The volume fraction and size of primary carbides increase with increasing carbon addition. The main morphology of the carbides is script-like in the alloys with carbon addition while the carbide sheets tend to be concentrated and coarse in the boron-containing alloys. © 2013 The Nonferrous Metals Society of China.

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