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Zhou Z.,Northwestern Polytechnical University | Zhang L.,Xian Super Crystal Science and Technology Development Co. | Chen Y.,Northwestern Polytechnical University | Kou H.,Northwestern Polytechnical University | And 3 more authors.
Ti 2011 - Proceedings of the 12th World Conference on Titanium | Year: 2012

Certain applications may require high-strength titanium fastener with a combination of high tensile strength,shear strength and fatigue strength. Over the past few years, the study of the relationship between the heat treatment parameter and the tension strength or fatigue strength in titanium alloy has achieved a strong development But there has little information on the shear strength. In this work,β21s titanium alloy has been adopted to investigate the characteristics of aging treatment on the shear strength. The results show that the longer the aging holding time is, the lesser of α phase amount becomes. Hence, the higher aging temperature results in a decrease in shear strength. The SEM images reveal that the a precipitates were slightly coarser after long holding times during aging treatment. As a result, the shear strength increases. An additional investigation in this study is about the effect of the specimen's dimension on the shear strength. It is showed that with the increase of the specimen' s dimension, the double-shear strength decreases.


Wang L.,Chongqing University | Zhang X.,Chongqing University | Xue X.,Xian Super Crystal Science and Technology Development Co. | Wen H.,Xian Super Crystal Science and Technology Development Co. | Li Z.,Northwest Institute for Nonferrous Metal Research
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2013

The microstructure and texture evolution of Zirconium tubes extruded at different temperatures have been investigated using X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) technology. The results show that dynamic recovery and recrystallization occurred in the hot-extruded tubes. The microstructure consists of sub-grains containing small angle boundary and equiaxed grains. The temperature has no effect on the mean size of equiaxed grains. However, there is wide difference in texture at different temperatures. The texture component of the tube extruded at 650°C consists of <101̄0> fiber and {0001}<101̄0>, while the texture component is <112̄0> fiber and {0001}<112̄0> with more basal poles in the tangential direction for the tube extruded at 630°C. Copyright © 2013, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Zhang L.,Xian Super Crystal Science and Technology Development Co. | Guo K.,Xian Super Crystal Science and Technology Development Co. | Shao B.,Xian Super Crystal Science and Technology Development Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

The effects of heat treatment on the microstructure and mechanical properties of β21s alloy sheets were investigated by using optical microscope and tensile tester. The results show that the alloy after solution treatment at 815~845 ℃ has a moderate strength and an excellent ductility at the room temperature, and with the increase of solution temperature, strength is decreased and plasticity is increased. After aging treatment, alloy exhibits high strength and good plasticity, and with the increase of aging temperature, the strength is decreased with the increase of plasticity. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


Zhang L.,Xian Super Crystal Science and Technology Development Co. | Wang X.,Xian Super Crystal Science and Technology Development Co. | Chang H.,Xian Super Crystal Science and Technology Development Co. | Chang H.,Northwestern Polytechnical University | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

Effects of solution temperature on microstructure and mechanical properties of TB8 titanium alloy were studied. The results show that, with solution temperature increasing, β grains grow up obviously, strength decreases slightly and plastic gradually increases. After solutiong and aging treatment, a lot of α phase is homogeneous precipitated from the grain boundary and grain interior of β, strength increases and plasticity decreases. The alloy has high strength and good plasticity after soulationed at 770-830°C, and aged at 520°C, comprehensive properties of the alloy is excellent, σb>1300 MPa, δ>15%, Ψ>55%.


Zhou Z.,Xian Super Crystal Science and Technology Development Co. | Kou H.,Northwestern Polytechnical University | Xue X.,Xian Super Crystal Science and Technology Development Co. | Xue X.,Northwestern Polytechnical University | And 4 more authors.
Advanced Materials Research | Year: 2013

The energetic and electronic structure of α-type Ti1-xXx(X=Al and Zr, x=0.0625, 0.125, 0.185, 0.250, 0.3125and 0.375) binary alloys were calculated by the method of supercell and augmented plane waves plus local orbitals within generalized gradient approximation. The results show that the formation energy decreases with the composition of Al, while increases with composition of Zr, which indicate that α phase can be enhanced by increasing the Al contents while weaken by increasing Zr contents. The DOS results shows that the Fermi levels of Ti1-xAlxand Ti1-xZrxfall on a dip of a DOS curve, which means the α structure of these alloys is stable. When the Al content is increased, the charge transfer between the Al and its neighbors becomes more evident, and enhance the stability of the α phase. With an increase of Zr content, repulsive interaction between two Ti atoms strengthen, which result in the α phase stability decrease. © (2013) Trans Tech Publications, Switzerland.

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