X. Q. Zhang
,
Y. H. Peng
,
M. Q. Li and X. Y. Ruan( 1)Department of Plasticity Technology
,
Shanghai Jiao TOng University
,
Shanghai 200030 2)School of Material Science and Engineering
,
Northwestern Polytechnical University
,
Xi' an 710072
,
China)
金属学报(英文版)
In the present research, artificial artificial networks hare be applied to establish the constitutive rela- tionship model of Ti - 5Al - 2Sn - 2Zr - 4Mo - 4Cr (wt - % ) alloy. In the first stage of the re- search, an isothermal compressive experiment using Thermecmastor - Z hot simulator is studied to ac- quire the flow stress at different deformation temperature,equivalent strain and equivalent strain rate. Then,a feed - forward neural network is trained by using the experimental data.After the training process is finished, the neural networks become a knowledge-based constitutive relationship system. Comparison of the predicted and experimental results results shows that the neural network model has good le- arning precision and good generalization.The neural neural network methods are found to show much better agreement than existing methods with the experiment data, and have the advantage of being able to deal with noisy for or data with strong non - linear reationships. At last, this model can be aused to simulate the flow behavior of Ti - 5Al - 2Sn - 2Zr - 4Mo - 4Ca alloy.
关键词:
titanium alloy
,
null
,
null
,
null
KONG Fanya YANG Kenu LU Yong'an SUN Shuxue Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
The concentration distribution of alloying elements such as Al,Sn,V,Si and Mo in surface layer of quenched Ti alloy melts(TC4,TA 7 and TC9)has been determined by EPMA.Ti al- loy samples were melted and evaporized by electron beam in water cooled copper curcible.The activity coefficient of alloy elements in Ti alloy melts are:γ_(Al)=0.009—0.018 and γ_(Sn)=0.066 —0.123 at 1921—2106℃;γ_V=0.713 at 2021℃;γ_(Si)=0.020 and γ_(Mo)=0.913 at 1921℃.The rate controlling steps of the evaporation of alloying elements Al,Sn,V,Si and Mo from Ti al- loy melts have been discussed with the data of evaporation activation energies of such alloy el- ements.
关键词:
titanium alloy
,
null
,
null
,
null
J. Zhang1
,
2)
,
G.P. Li1) and D. Li1) 1) Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China 2) Shenyang University
,
Shenyang 110044
,
China
金属学报(英文版)
omesolution treatmentsfor Ti 5 8 Al 4 8Sn 2 0Zr 1 0 Mo 0 34Si 0 90 Nd (1 # alloy) , Ti 6 3 Al 4 8 Sn 2 0 Zr 1 0 Mo 0 34 Si 0 90 Nd(2 # alloy) and Ti 6 8 Al 4 8Sn 2 0 Zr 0 5 Mo 0 34 Si 0 70 Nb 0 90 Nd (3 # alloy) several near alpha Titanium alloysat various temperaturesin (α+ β) two phaseregion havebeen carriedout. Theeffectsofsolution treat menttemperatureon theshape,size, distribution andvolumefraction ofthe primary alpha phase(αprim)havebeeninvestigated. Theresultsshowed thattheshape ofαprim did not depend onthesolution temperature, butthesize, the distribution and the volume fraction changed withthevariedsolutiontreatmenttemperature. Theprimaryalpha phaseprincipally precip itated atthe βgrain boundary regions atthe higher temperature nearthe Tα+ β/ β, and asthe temperature was dropped, αprim precipitated in a more uniform way. By energy spectrumanalysisof SEM, the elemental distributionsin primary αphase and transformed βphase(βtrans) havebeeninvestigated. The resultsshowed thatthe amount of Alelementin αprim is higherobviouslythanin βtransathighertemperature. Asthesolution temperature gotdropped theconcentrationsof aluminum elementgot moreuniform in both αprim and βtrans. Thehigher concentration of aluminum elementin αprim would play a importantrolein orderedα2 phase precipitation, and so have an importanteffecton the high temperature properties of the al loys.
关键词:
titanium alloy
,
null
,
null
H.G. Wang
,
X.M. Qi
,
J. Tian
,
W.Q. Zha
,
G.S. Liang
,
Y. Y. Chen and J. Jia National Key Laboratory of Precision Hot Processing of Metals
,
Harbin Institute of Technology
,
Harbin 150001
,
China
金属学报(英文版)
Effects of different facing oxides, including including yttria colloidal and powders (Y/Y), yttria stabilized zirconia colloidal and powders (ZY/ZY), zirconia colloidal and powders (Z/Z) and zirconia colloidal and zireonite powders (Z/ZS) on the qualities of investment castings are studied. The outward appearance, microstructures, and microhardness profiles of castings made of commercial pure titanium, Ti--Al--V and Ti--Al--Zr are investigated. Castings made by shells with yttria as face materials have the least contamination and by zirconite shells have the most contamination. Thermodynamic of metal-mold reactions is also taken into consideration.
关键词:
titanium alloy
,
null
,
null
X.S. Liu
,
H.Y. Fang
,
W.L. Xu
,
Z.B. Dong
,
D.Y. Yu
金属学报(英文版)
It is a promising and new technology to apply welding with trailing peening to control
welding stress and distortion of titanium alloy. Numerical simulation of conventional
welding and welding with trailing peening of the titanium alloy sheet is carried out,
using nonlinear ¯nite element theory and the engineering analysis software MARC.
The result shows that welding with trailing peening technology reduces longitudinal
residual stress in welding joint e®ectively, and it is more e®ective to reduce residual
stress to peen the weld than to peen the weld toe. It is a e®ective result that other
technology and method used in welding can never achieved.
关键词:
numerical simulation
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null
,
null
,
null
唐长斌
,
王展
,
林震宇
,
吴晓东
,
王小明
材料保护
钛基生物医学材料广泛应用于人体硬组织的修复,但耐磨性较差,限制了其更广泛的应用.采用瞬态电能强化技术以石墨为电极对钛合金TC4进行表面改性,对比研究了在空气、氩气和氮气气氛下获得的强化层的性能,并对氮气中制备的强化层的生物相容性进行了评价.结果表明,强化改性层物相主要为TiC及石墨相,表面硬度有较大提高,摩擦学性能获得显著改善,改性层与基体相比仍具有优异的耐蚀性能;氩气和氮气气氛下获得的强化层表面裂纹比空气气氛下的少;氮气保护下可得到裂纹较少、具有一定粗糙度、耐磨、生物相容性好且与基体为冶金结合的强化层.
关键词:
表面改性
,
生物医学材料
,
钛合金
,
瞬态电能处理
,
保护气氛
,
摩擦磨损
,
耐蚀性
,
生物相容性
刘玉敏
,
李鹏
,
李任和
电镀与涂饰
为克服钛合金氰化镀铜、镀银层结合力不良的问题，通过改变基体预处理方式设计了5个镀铜、镀银方案并进行结合力表征，得到钛合金镀铜、镀银的最佳工艺流程为：湿吹砂─保护─轻石灰刷洗除油─冷水洗─酸性镀铜或氰化镀银─冷水洗─压缩空气吹干。生产实践证明采用该工艺电镀所得产品结合力均合格，且含氢量不超标。介绍了电镀过程中控制钛合金含氢量的方法和注意事项。
关键词:
钛合金
,
铜
,
银
,
电镀
,
湿吹砂
,
结合力
,
含氢量
王建民
,
汪景奇
,
苏勇
,
王开啸
,
任强
电镀与涂饰
在3 g/LNaOH溶液中加入NaF添加剂作为电解液,研究了电压和添加剂浓度对钛合金板表面氧化膜的颜色、硬度和耐腐蚀性的影响,分析了氧化膜的扫描电镜图和X射线衍射图.结果表明:电压是影响阳极氧化膜性能的主要参数,电压和NaF浓度的变化都能引起氧化膜颜色、硬度、耐腐蚀性以及表面形貌等的改变.
关键词:
钛合金
,
阳极氧化
,
电压
,
氟化钠
,
硬度
,
耐蚀性
,
表面形貌
翟可新
,
王勇
,
刘元清
,
刘林
冶金分析
doi:10.13228/j.boyuan.issn1000-7571.009434
以合适的钛合金标准样品绘制校准曲线,用惰性气体熔融-热导/红外法测定,建立了钛合金中氧、氮和氢的同时测定方法.确立了最佳实验条件:对于0.13～0.15 g试样,镍篮助熔剂的用量为1 g,分析功率为0.55 kW.氧、氮和氢的线性范围分别为0.000 1％～0.1％、0.000 1％～0.01％和0.000 05％～0.002％(质量分数),方法检出限分别为0.000 045％、0.000 061％和0.000 018％(质量分数).采用实验方法测定钛合金实际样品中氧、氮和氢,测定结果与国家标准方法(GB/T4698.7-2011和GB/T4698.15-2011)的测定结果基本一致,相对标准偏差(RSD,n=6)在0.14％％～4.6％范围.
关键词:
惰性气体熔融
,
热导法
,
红外法
,
钛合金
,
氧
,
氮
,
氢
