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  • Role of boron in TiAl alloy development: a review
  • 硼在 1990 年代的开始在演员组 TiAl 合金被发现是唯一的谷物更精制并且在大多数合金迄今为止开发了的 TiAl 成为了一个元素。在过去的 25 左右年,在团结理解硼的角色的努力,稳固阶段的转变,热并且 thermomechanical 处理和 TiAl 合金和相关机制的机械性质从来没停止。作为结果,在 TiAl 合金的硼上的丰富的知识在各种各样的研究论文和会议论文录被积累了,但是散布。这评论在在 TiAl 合金系统上理解硼和它的影响总结进步。
  • Advances in phase relationship for high Nb-containing TiAl alloys
  • 包括二个范畴(常规 TiAl 和高包含 Nb TiAl (高 NbTiAl )) ,因为他们的应用程序, -TiAl 合金是技术上吸引人的。明确地,高 NbTiAl 合金的服务温度是 60100
  • Microstructure characterization and tensile properties of a Ni-containing TiAl-based alloy with heat treatment
  • 团结微观结构和 Ti-48Al-2Cr-2Nb 合金的张力的性质上的 Ni 增加的效果用微分扫描被调查热量测定(DSC ) , X 光检查衍射(XRD ) ,与精力散的分光镜(版本) 装备的扫描电子显微镜学(SEM ) 和传播电子显微镜学(TEM ) 。与 3 at% Ni 增加,当演员组微观结构主要由好薄片状的殖民地(~ 50m ) 组成的结果表演,谷物和富有 Ni 的 3 阶段。在在 13800 点的热处理以后
  • Solidification microstructure characteristics of Ti-44Al-4Nb-2Cr-0.1B alloy under various cooling rates during mushy zone
  • Beta-solidifying TiAl alloy has great potential in the field of aero-industry as a cast alloy.In the present work,the influence of cooling rate during mushy zone on solidification behavior of Ti-44Al-4Nb-2Cr-0.1B alloy was investigated.A vacuum induction heating device combining with temperature control system was used.The Ti-44Al-4Nb-2Cr-0.1B alloy solidified from superheated was melted to β phase with the cooling rates of 10,50,100,200,400 and 700 K·min-1,respectively.Results show that with the increase in cooling rate from 10 to 700 K·min-1,the colony size of α2/γ lamella decreases from 1513 to48 urn and the solidification segregation significantly decreases.Also the content of residual B2 phase within α2/γlamellar colony decreases with the increase in cooling rate.In addition,the alloy in local interdendritic regions would solidify in a hypo-peritectic way,which can be attributed to the solute redistribution and enrichment of Al element in solidification.
  • Microstructure and properties of a beta-solidifying TiAl-based alloy with different refiners
  • 这研究系统地在微结构精炼和 Ti43Al5Nb 合金的性质上比较了钇(Y) ,硼(B) ,和碳(C) 的影响。在 TiAl 合金的微结构精炼效果仔细取决于更精制使用。殖民地尺寸和薄片状的厚度上的三个元素的精炼效果能作为 B 被安排 > Y > C 和 Y > C > B 分别地。而且,有一种小谷物尺寸的微观结构和极其细小的薄片状的间距能被增加 B 或 B 和 C 获得。TiAl 合金的机械性质被重新好也影响。有合适的 B 和 Y 内容的 TiAl 合金展出有利热可使用性,张力的性质,和破裂坚韧,而包含 C 合金显示差的张力的性质和低破裂坚韧。这些结果显示 Y 和 B 是更多的合适的微观结构比 C 重新好。这研究可以为实际 alloying 设计用作一本参考书。
  • Transition of solidification path in nonequilibrium solidification of Ti-48Al-8Nb alloy
  • The solidification behavior of Ti-48Al-8Nb alloy under nonequilibrium solidification conditions was studied by electromagnetic levitation technique.The solidification conditions are different undercooling(△T)under the same cooling condition and different cooling methods at the same undercooling condition,respectively.In different undercooling conditions,when the undercooling is above a critical value(△T*≈211K),a remarkable morphological transition from typical hypoperitectic solidification to a sole solidification of the(3 phase resulting in the suppression of the peritectic reaction occurs.For melts with different cooling conditions at the same undercooling(△T≈85 K),the melt was rapidly cooled by quenching them in cooling media.With cooling rate increasing,a transition from β phase to peritectic α phase solidification mode is revealed for Ti-48Al-8Nb alloy.
  • Growth rate and composition of directionally solidified intermetallic TiAl-Nb alloys with different solidification conditions
  • Intermetallic Ti-xAl-8Nb(x = 41,43,45,47,49;at%) alloys were solidified unidirectionally upwards with a constant temperature gradient of G=3.8 K·mm-1at wide range of growth rates of v=10-400 μm·s-1using a Bridgman directional solidification(DS) furnace.Microstructural parameters including the primary dendrite arm spacing(λ1),secondary dendrite arm spacing(λ2),dendrite tip radius(R) and mushy zone depth(d) were measured statistically.The values of λ1,λ2,R and d decrease as the growth rate increases for a given composition(x).The values of λ1,λ2,R and v increase with the increase in x value,while the value of d firstly increases and then decreases with the increase in x value for a given v.The relationships between λ1,λ2 and R were analyzed by the linear regression.The average growth rate exponent of λ1 is 0.29,which is in accordance with the previous experimental observations,and that of λ2 is close to the previous experimental results,while those of R and d are lower than the results in other alloy systems.In addition,theoretical models for λ1,λ2 and R were compared with the experimental observations,and a comparison of the present experimental results with the theoretical models and previous experimental results was also made.
  • Lamellar morphology of directional solidified Ti-45Al-6Nb-xW alloys
  • Directional solidification of Ti-45Al-6Nb-xW(x=0,0.4,0.8;at%) alloys was performed by Bridgeman method with the stable growth rate of 5,10,and 20 μm·s-1.The differential scanning calorimeter(DSC) results indicate that both the eutectic temperature and the transition temperature of α(Ti3Al) to γ(TiAl) increase with W content increasing from 0 at%to 0.8 at%.For the stable growth rate of 10 μm·s-1,the orientations of α2(Ti3Al)/γ(TiAl)lamellae change from 45°(0 at%W) to 0° and near 0°(0.4at%and 0.8 at%W) to the crystal growth direction,and the spacing of α2/γ lamellae decreases with W content increasing from 0 at%to 0.4 at%,while it increases when W content is 0.8 at%.With the increase in growth rate from5 to 10 and 20 μm·s-1,the lamellar spacing of α2/γbecomes smaller,and the lamellar thickness becomes more uniform.
  • Microstructure and microsegregation of directionally solidified Ti-45Al-8Nb alloy with different solidification rates
  • Microstructure and microsegregation of directionally solidified Ti-45Al-8Nb alloy were investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM) and electron probe microanalyzer(EPMA).For the alloy solidified at the solidification rates(v) ranging from 10 to 400 μm·s-1,the microstructure of the mushy zone exhibits a cellular-dendritic structure at lower growth rate(v=10-50 μm·s-1) and a typical dendritic morphology at higher growth rate(v = 100-400 μm·s-1).The relationship between primary dendrite arm spacing(λ1)and v is λ1=1.08×103v-0.35.Al and Nb elements segregate at interdendritic zone and in the dendritic core,respectively.In solid of mushy zone,a relatively flat concentration profile is observed for the typical dendrite structure,and Nb enriches in B2 phase induced by β→α+βtransformation.The content of B2 phase is hardly affected by v.The extent of microsegregation in steady-state zone decreases at a lower growth rate because holding the samples at higher temperature after solidification for a long time can homogenize the solid effectively.
  • Turning machining induced microstructural stability of a high Nb-containing TiAl alloy during high temperature exposure
  • 转弯用机器制造导致的微结构不稳定性在充分薄片状的 Ti45Al8.5Nb 被调查(W, B, Y ) 合金在高温度暴露期间。在 900 或 1000 钰 ? 由热暴露在转弯用机器制造以后列在后面 ? 莰 ?芀
  • Microstructure evolution of Ti-46Al-6Nb-(Si,B) alloys during heat treatment with W addition
  • The cast ingots of Ti-46Al-6Nb-0.25Si-0.2B and Ti-46Al-6Nb-0.5W-0.25Si-0.2B(at%) were made by induction skull melting(ISM) technique.A series of heat treatments(HTs) were conducted to research the microstructure evolution of both alloys.Microstructure and tensile property were examined by scanning electron microscope(SEM),X-ray diffraction(XRD),transmission electron microscope(TEM),and tensile testing machine.The results show that microsegregation(liquid segregation and solid segregation) is exacerbated by the addition of0.5 at%W;the addition of Nb,W in TiAl alloy makes the phase transition difficultly take place;then,the microstructures and tensile properties of both alloys are improved after certain HT processes;finally,the thicknesses of the γ/α2 lamellae after a certain HT process are significantly affected by the number of residual γ phases before the furnace-cooling moment.
  • Fatigue properties of a medium-strength γ-TiAl alloy with different surface conditions
  • 中等力量的 -TiAl 合金 Ti45Al5Nb1W (at%) 的疲劳性质上的表面状况的效果被调查。疲劳样品的最大的压力比中等力量的 -TiAl 合金的收益压力低,这被发现。同时,本地塑料变丑是不明显的发生在裂缝尖端。在这种情况中,疲劳力量被强调最大值的表面的表面条件主要决定,但是压缩应力和变丑特别源于射击 peening 玩在条件疲劳力量的改进的一个重要角色。射击 peening 的影响深度关于 250m。作为结果,相对弱的微观结构和阶段成为优先的开始地点和繁殖线路。他们被观察是 equiaxed 谷物, B2+ 谷物,和 2- 在软取向的薄片状的接口。V 槽口的存在能显著地减少样品的疲劳性质。
  • Reaction behaviors occurring in Ti/Al foil metallurgy
  • 发生在 Ti/Al 陪衬冶金学的反应行为系统地被调查。特别强调象在 TiAl 3 和 Ti 层之间的随后的反应一样集中于在稳固的艾尔和 Ti 之间的反应。在在艾尔和 Ti 之间的稳固的反应,剩余艾尔的存在被 TiAl 3 层并且在接口的微虚空的存在的不同类的生长主要引起。然而通过在熔融的艾尔和 Ti 之间的反应, TiAl 3/Ti 多层的罐头与艾尔的完全的消费被完成。在随后的高温度的热处理期间, TiAl 3/Ti 多层将最后变成 Ti 3 与同时的形成和中介的连续消失的多层的伴随分阶段执行的 Al/TiAl,例如 TiAl 2 和 Ti 2 艾尔 5 。而且, TiAl 层的生长方向在多金属间化合作为退火的功能改变在不同夫妇之间的时间,这被发现系统。
  • Characterization of creep behavior of TiAl alloy with high Nb content at elevated temperatures
  • 爬有高 Nb 内容的 TiAl 合金的实验被进行考虑它的 creep 行为的温度依赖和压力依赖。creep 曲线被 Theta 组成的模型描绘,并且 NewtonGauss 方法被使用获得材料参数。基于破裂紧张, TiAl 合金的破裂生活能被 Theta 预言组成的模型。TiAl 合金的 creep 曲线包含的结果表演主要爬,第二等爬并且第三级爬阶段,特别为更低的压力。TiAl 合金的破裂生活随应用应力或温度的增加减少。Theta 组成的模型能精确地描述 TiAl 合金的 creep 变丑,并且预言的生活与试验性的结果同意很好。
  • Microstructure and fatigue properties of TiAl-based alloy with different tungsten contents
  • 有不同 W 内容的基于 TiAl 的合金的微观结构和疲劳性质被调查。结果显示谷物尺寸和薄片状的间距能显著地被精制,并且微观结构和疲劳上的最佳的 W 内容性质大约 1.00at% 。阶段逐渐地随 W 内容的增加增加的 B2() 的数量,和过多的 B2() 阶段在是有对裂缝繁殖的低抵抗的弱区域的薄片状的殖民地趋势的边界定位了。另一结果是随 W 内容的增加,包晶体的反应的区域也被扩大。interdendritic Al 富有的区域是对快克的另一个弱区域繁殖。这两效果与 Ti45.7Al5Nb0.75W1.4B 合金的相比为 Ti45.1Al5Nb1.40W1.4B W 合金的更坏的疲劳性质负责。疲劳性质的不稳定性仍然存在,但是它稍微在谷物尺寸和薄片状的间距与减少减少。
  • Hot deformation behavior and process parameter optimization of Ti22Al25Nb using processing map
  • Ti22Al25Nb 的热变丑行为被热压缩测试调查。流动 stressstrain 曲线能被划分成二种类型:常规动态再结晶(DRX ) 和不连续的 DRX。常规 DRX 和不连续的 DRX 的不同弄软机制和微观结构观察被分析。Ti22Al25Nb 的处理地图(下午) 被造预言安全变丑区域。最佳的低紧张率领域(DOM 我) 与高力量,驱散效率显示完全的 DRX。另外处于高紧张率和低温度的领域(DOM III ) ,力量驱散效率是低的并且一些断热砍乐队并且滑行乐队们被观察,它是不安全的并且应该被避免。最后, DRX 地图被建立。在 DOM 我,它揭示低脱臼密度和高 DRX 内容,它与下午一致。
  • Role of boron in TiAl alloy development: a review(Dawei Hu)
    Advances in phase relationship for high Nb-containing TiAl alloys(Yong-Feng Liang;Xiang-Jun Xu;Jun-Pin Lin)
    Microstructure characterization and tensile properties of a Ni-containing TiAl-based alloy with heat treatment(Jian-Chao Han[1,2];Shu-Long Xiao[1,2];Jing Tian;Yu-Yong Chen[1,2,3];Li-Juan Xu;Xiao-Peng Wang[1,2];Yi Jia[1,2];Shou-Zhen Cao[1,2])
    Solidification microstructure characteristics of Ti-44Al-4Nb-2Cr-0.1B alloy under various cooling rates during mushy zone(Peng Han;Hong-Chao Kou;Jie-Ren Yang;Guang Yang;Jin-Shan Li)
    Microstructure and properties of a beta-solidifying TiAl-based alloy with different refiners(Ning Cui;Xiao-Peng Wang;Fan-Tao Kong;Yu-Yong Chen[1,2];Hai-Tao Zhou)
    Transition of solidification path in nonequilibrium solidification of Ti-48Al-8Nb alloy(Tan He;Rui Hu;Jie-Ren Yang;Tie-Bang Zhang;Jin-Shan Li)
    Growth rate and composition of directionally solidified intermetallic TiAl-Nb alloys with different solidification conditions(Li-Wei Zhang;Jun-Pin Lin;Xiang-Jun Xu;Jian-Ping He;Xian-Fei Ding;Xiao-Ou Jin)
    Lamellar morphology of directional solidified Ti-45Al-6Nb-xW alloys(Zhi-Yuan Hou[1,2];Yong-Sheng Li[1,2];Hao-Jie Mei[1,2];Kai Hu[1,2];Guang Chen[1,2])
    Microstructure and microsegregation of directionally solidified Ti-45Al-8Nb alloy with different solidification rates(Xiang-Jun Xu;Lin Song;Xiao-Ou Jin;Dong-Dong Han;Xin Wang;Jun-Pin Lin)
    Turning machining induced microstructural stability of a high Nb-containing TiAl alloy during high temperature exposure(Lu Fang;Jun-Pin Lin;Xiao-Chan Qiu;Jin-Xiao Ou;Xian-Fei Ding)
    Microstructure evolution of Ti-46Al-6Nb-(Si,B) alloys during heat treatment with W addition(Shou-Zhen Cao[1,2];Shu-Long Xiao[1,2];Yu-Yong Chen[1,2];Jing Tian;Li-Juan Xu;Xiao-Peng Wang;Jian-Chao Han[1,2];Yi Jia[1,2])
    Fatigue properties of a medium-strength γ-TiAl alloy with different surface conditions(Zhen-Jun Yang;Hong-Liang Sun;Ze-Wen Huang;Xiao-Song Jiang;Song Chen)
    Reaction behaviors occurring in Ti/Al foil metallurgy(Zheng-Zhang Shen;Jun-Pin Lin;Yong-Feng Liang;Lai-Qi Zhang;Guo-Jian Hao)
    Characterization of creep behavior of TiAl alloy with high Nb content at elevated temperatures(Cheng-Li Dong[1,2];Hui-Chen Yu[1,2];Ze-Hui Jiao[1,2])
    Microstructure and fatigue properties of TiAl-based alloy with different tungsten contents(Zhen-Jun Yang;Hong-Liang Sun;Ze-Wen Huang;De-Gui Zhu;Liang-Hui Wang)
    Hot deformation behavior and process parameter optimization of Ti22Al25Nb using processing map(Jing-Li Zhang;Hong-Zhen Guo;Hou-Quan Liang)
    《稀有金属:英文版》封面

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