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He H.,Xian University of Architecture and Technology | Wang K.,Xian University of Architecture and Technology | Hu P.,Xian University of Architecture and Technology | Kang X.,Xian University of Architecture and Technology | And 3 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

The different doping methods of La-TZM alloy plate were studied by observing and comparing the fracture and structure. The effect of La2O3 and La (NO3)3 on tensile properties and elongation of TZM alloy was discussed. The results show that the tensile strength of La2O3-TZM alloy plate is 1057 MPa and the elongation is 8.2%, while the tensile strength of La (NO3)3-TZM alloy is 1202 MPa, and the elongation is 7.0%. La (NO3)3 doped TZM alloy plate has finer second phase, and it makes the strength even higher, but lower the elongation. © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. Source


Kang X.,Xian University of Architecture and Technology | Wang K.,Xian University of Architecture and Technology | Zhang Z.,Xian University of Architecture and Technology | Hu P.,Xian University of Architecture and Technology | And 4 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

Based on TZM molybdenum alloy, La-TZM alloy sheets, with solid-solid doping of rare earth La2O3 or liquid-solid doping of La(NO3)3, were manufactured by sintering, hot rolling, warm rolling and cold rolling. The powder morphology, microstructures of sintering compact and fracture morphology of the alloy sheets were observed by SEM, and the alloy powder particle size and alloy composition were analyzed by particle size distribution and EDS, respectively. The results show that the distribution of the second phase in the La(NO3)3 doped TZM alloy sheets is more uniform than that in La2O3 doped TZM alloy sheets. The grain size of La(NO3)3 doped TZM alloy is finer. Besides, the tensile strength of La(NO3)3 doped TZM alloy is much higher than that of La2O3 doped alloy, which increases by 10.9%. ©, 2015, Rare Metals Materials and Engineering Press. All right reserved. Source


He H.,Xian University of Architecture and Technology | Wang K.,Xian University of Architecture and Technology | Hu P.,Xian University of Architecture and Technology | Kang X.,Xian University of Architecture and Technology | And 3 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

TZM alloy and rare earth element La doped TZM alloy sheet were prepared by powder metallurgy and rolling, respectively. The effect of La2O3-doping on recrystallization temperature of TZM alloy was investigated by comparing the annealed structure and mechanical property after annealing at 1000, 1100, 1200, 1300, 1400, 1500 and 1600℃. The study shows that the recrystallization temperature of TZM alloy is about 1200℃, while that of La doped TZM alloy is about 1300℃. The La2O3 second phases draw finely around grain boundaries and retard the migration of recrystallization grain boundaries, thus raising the recrystallization temperature of TZM alloy sheet. ©, 2015, Rare Metals Materials and Engineering Press. All right reserved. Source


Hu P.,China University of Technology | Wang K.-S.,China University of Technology | He H.-C.,China University of Technology | Kang X.-Q.,China University of Technology | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

The conventional TZM alloy plates have limited manufacture and application due to the lacking of enough mechanical property. To resolve this question, La doped TZM alloy plate was made by the powder metallurgy. With solid-solid rare La2O3 doping, sintering, hot rolling, warm rolling and cold rolling, the molybdenum alloy La-TZM plates were got. This kind of TZM alloy has better properties in both strength and elongation. The tensile strength of La-TZM alloy is 1038 MPa, and the elongation is 10.4%. Metallography test and scanning electron microscopy (SEM) are used to examine the microstructure of the La-TZM alloy plate specimen. © (2013) Trans Tech Publications, Switzerland. Source


Hu P.,Xian University of Architecture and Technology | Wang K.,Xian University of Architecture and Technology | Wang H.,XiAn Electrical Furnace Institute Co. | He H.,Xian University of Architecture and Technology | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

Nanocrystalline Mn-Zn ferrite powder was prepared by nitrate-citrate auto-combustion synthetic method and subsequently annealed at different temperatures in muffle furnace without protective atmosphere. The effects of heat treatment temperature on crystalline phase formation, microstructure and magnetic properties of the Mn-Zn ferrite were investigated by FTIR, TG-DTA, XRD, SEM and VSM. The results show that when annealed above 550°C in air, the ferrite decomposes to Fe2O3 and Mn2O3, and has poor magnetic properties, when annealed above 1100°C, Fe2O3 and Mn2O3 are dissolved, and the sample annealed at 1200°C is composed of pure ferrite phase with good crystallinity and uniform grain and has larger saturation magnetization (Ms=48.15 emu·g-1) compared with that of the auto-combusted ferrite powder. Source

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