材料期刊网

PRECIPITATION AND MICROSTRUCTURE OF Cr MODIFIED Al3Ti

W.H. Tian

金属学报(英文版)

The microstructures of Cr modified Al3 Ti containing Al2 Ti and L10-AlTi precipitateshave been investigated in terms of transmission electron microscopy ( TEM). Fine pre-cipitation of Al2 Ti (Ga2Hf type structure) and L 1o-AlTi(Cr) occurs in L l2-Al3 Ti(Cr)by aging around 973K. The aging behavior wa...

关键词: titanium aluminide , null , null , null , null

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF P/M TiAl ALLOYS AND THE TEMPERATURE EFFECT

Z.M.Sun , H.Hashimoto , S.Sumi , Y.H.Park and T.Abe (Materials Engineering Division , Tohoku National Industrial Research Institute 4-2-1 Nigatake , Miyagino-ku , Sendai 983-8551 , Japan) Z.H. Shan (Research Fellow of Science and Technology Agency of Japan STA)

金属学报(英文版)

Two intermetallic compounds of Ti-50at.% Al and Ti-48at.% Al-2at.% Cr were prepared with a mechanical alloying and pulse discharge sintering process. The as-sintered material showed a microstructure of equiaxed gamma grain with sub-micron size. Heat treatments in vacuum at different temperatures up ...

关键词: titanium aluminide , null , null , null , null

INVESTIGATION ON 1/3[111] FRANK LEDGE DISLOCATIONS AT α_2/γINTERFACE IN HOT-DEFORMED Ti-45Al-10Nb ALLOY

J.G WanG , L.C Zhang , G.L. Chenand HQ. Ye(State Key Laboratory for Advanced Metals and Materials , Unborsity of Science and Technology Beijing , Beijing 100083 , China)(Laboratory of Atond Imaging of Solids , Institute of Metal Research , Chinese Academy of Sciences , Shenyang 110015 , China)

金属学报(英文版)

The dislocation ledges at the α2/7 intedece in a hot-dejormed Ti-45Al-10N alloywere analyzed by high-resolution tmnsmission electron microscopy. A new type ofdislocation ledge containing 1/3[111] Frank partial was found. The height of the ledgestDas always three [111]γplanes. The Burpers vectore of ...

关键词: titanium aluminide , null , null , null

Fractal Dimensions of Hydrogen Induced Brittle Fracture of Titanium Aluminide

Yue ZHANG Yanbin WANG Lijie QIAO Wuyang CHU Chimei HSIAO Dept.of Materials Physics , University of Science and Technology , Beijing , Beijing , 100083 , China

材料科学技术（英文）

The relationship between the stress intensity factor K_1~* required for brittle crack initiation and propa- gation and the fractal dimension D_F of the fracture surface was derived,i.e, InK_1~*=(1/2)In2γE'+(1/2)In(d_f/L_0)(1-D_F) The real surface energy can be calculated based on the measured linear...

关键词: titanium aluminide , null , null

等温变形对γ-TiAl合金微观组织的影响

黄朝晖

稀有金属材料与工程

通过等温压缩特性及微观组织演变研究,提出了有效的γ-TiAl基合金晶粒细化方法.研究发现,如果γ-TiAl合金锭具有一定的细晶组织便可以在(α2+γ)2相区完成等温变形而不产生裂纹.动态再结晶和静态球化数量的增加是提高γ-TiAl合金变形能力的主要原因.将等温变形的模拟锻件在不同相区进行热处理获得了...

关键词: TiAl , 等温变形 , 细化 , 组织

Ti-47Al-2Mn-2Nb-0.8TiB_2合金韧脆转变温度及其应变速率敏感性

王瑜 , 林栋梁 , 刘俊亮 , C.C.Law

金属学报

采用拉伸试验，研究厂不同应变速率（10－5-10－1S-1）下温度对台体积分数为0．8％的TiB2、具有近全片层组织的Ti—47Al—2Mn－2Nb金属间化合物的屈服强度和延伸率的影响，得到合金韧脆转变温度随应变速率升高而升高的变化关系，确定这种含TiB2的TiAL合金的韧脆转变激活能为256kJ／...

关键词: TIAl , intermetullics , BDT , strain rate

Design for Isothermal Forging of Ti-46. 5Al-2.5V-1.0Cr-0.3Ni Alloy

钢铁研究学报(英文版)

关键词:

热等静压对铸造Ti-47.5Al-2.5V-1.0Cr合金持久性能的影响

朱春雷 , 李海昭 , 骆晨 , 张继

材料热处理学报

将定向层片组织铸造Ti-47.5Al-2.5V-1.0Cr(at％)合金在α+γ两相区分别进行了1270℃,180 MPa下1h,1.5h和2.5h的热等静压处理,然后在800℃和300 MPa条件下进行了持久断裂试验,以研究热等静压处理对该合金持久性能的影响.试验结果表明,在1270℃/180 M...

关键词: 热等静压(HIP) , TiAl , 持久性能 , 动态再结晶

Improvement of Creep and High Temperature Tensile Properties by Adding W to Orthorhombic Ti2AlNb-Based Alloys

材料科学与工程学报

关键词:

应变速率对近全片层组织γ-TiAl合金韧脆转变温度的影响

王瑜 , 林栋梁 , 刘俊亮 , C.C.LAW

金属学报

采用拉伸试验，研究了不同应变速率（10-5－10-1s-1）下温度对具有近全片层组织的γ＋α2双相Tial合金的屈服强度和延伸率的影响，得到Tial合金韧脆转变温度随应变速率升高而升高的变化关系，随后确定Tial合金韧脆转变激活能为324kJ／mol．这一激活能数值与Tial合金中原子自扩散激活能相...

关键词: TiAl , intermetallics , brittle-to-ductile transition , strain rate