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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.


Hu P.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology | He H.,Xi'an University of Architecture and Technology | Yang F.,Xi'an University of Architecture and Technology | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

The TZM alloy plates were prepared by powder metallurgy and rolling method. The microstructure of TZM alloy sintered blank and sheet were observed by metallographic microscope and scanning electron microscope. The results show that sintered blank density is 9.94 g/cm3, the Rockwell hardness is 65 HRC, the microstructure of sintered blank is equiaxed grain, grain uniform distribution, the average grain size is 10 μm and has clear outline of the grain boundary. The density of TZM alloy sheet is 10 g/cm3 after rolling, the tensile strength is 914 MPa and the elongation is 4.6%. Analysis and comparison of the microstructure for the annealed sample under 1000, 1100, 1200, 1300, 1400, 1500 and 1600°C show that the TZM alloy sheet is in the recovery stage at 1000°C, 1100°C, and in start recrystallization state at 1200°C, and fully recrystallized at 1600°C.


Hu P.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology | Wang H.,Xian Electrical Furnace Institute Co. | He H.,Xi'an 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.


Hu P.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology | Kang X.,Xi'an University of Architecture and Technology | He H.,Xi'an University of Architecture and Technology | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

The La-TZM alloy plates were prepared by powder metallurgy, and the effect of rolling ways on mechanical properties of plates was studied. The results show that the plates made by cross rolling method can obtain more uniform deformation, less anisotropy, and the mechanical properties of the longitudinal and lateral directions are about equal. Under different temperatures annealing state, the room temperature tensile strength and yield strength of the cross rolling plate are higher than that of the one-way rolling plate, but the elongation is improved greatly. The recrystallization temperature of the cross rolling plate is lower than that of the one-way rolling plate.


He H.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology | Hu P.,Xi'an University of Architecture and Technology | Kang X.,Xi'an University of Architecture and Technology | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

TZM alloy and La doped TZM alloy sheets were prepared by powder metallurgy process and rolling, then annealed at 1000, 1100, 1200, 1300, 1400, 1500 and 1600°C, respectively. Effect of La2O3 on recrystallization temperature of TZM alloy was investigated by observing and comparing the annealed microstructure. The results show that the recrystallization temperature of La doped TZM alloy is 1200°C, while that of TZM alloy is 1100°C. The fine La2O3 second phases are distributed around grain boundaries and retard the migration of grain boundaries which raise the recrystallization temperature. At the same time, the La2O3 around grain boundaries increases the nucleation rate, and refines the grain.


He H.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology | Hu P.,Xi'an University of Architecture and Technology | Kang X.,Xi'an 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.


He H.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology | Hu P.,Xi'an University of Architecture and Technology | Kang X.,Xi'an 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.


Kang X.,Xi'an University of Architecture and Technology | Wang K.,Xi'an University of Architecture and Technology | Zhang Z.,Xi'an University of Architecture and Technology | Hu P.,Xi'an 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.

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