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SUPERPLASTICITY AND SOLID STATE BONDING OF TITANIUM ALLOYS

R. Ya. Lutfullin , O.A. Kaibyshev , R.V. Safiullin , O.R. Valiakhmetov and M.H. Mukhametrahimov Institute for Metals Superplasticity Problems , Russian Academy of Sciences , Ufa 450001 , Russia

金属学报(英文版)

Experimental results related to solid state weldability of superplastic titanium alloys are presented. A correlation between superplastic flow and enhanced solid state weldability was established. It has been experimentally shown that a drop in the lower superplastic flow temperature with decreasing mean grain size provides an opportunity to decrease the temperature at whicmethods for titanium alloys.

关键词: superplasticity , null , null

STRUCTURE AND PHYSICAL PROPERTIES OF SUBMICROCRYSTALLINE METALS PREPARED BY SEVERE PLASTIC DEFORMATION

R. R. Mulyukov and M. D. Starostenkov( 1) Institute for Metals Superplasticity Problems of Russian Academy of Sciences , Khalturina 39 , Ufa 450001 , Russia 2)Altai State Technical University)

金属学报(英文版)

The results of investigations of structure and physical properties of submicrocrystalline (SMC) metals are presented. The SMC structure was formed by severe plastic deformation.The structure was investi- gated by calorimetric and mossbauer measurements and TEW stuidies. The behavior of physical proper- ties of SMC metals were analysed taking into account spectific features of their structure.

关键词: submicrocrystal , null , null , null

超微粉煤灰填充高密度聚乙烯复合材料的制备与性能

郭丹 , 薛白 , 包建军

高分子材料科学与工程

采用悬臂梁缺口冲击、差示扫描量热(DSC)、X射线衍射(XRD)和扫描电镜(SEM)等方法研究了蒸汽气流磨制备的超微粉煤灰(UFA)填充对高密度聚乙烯冲击强度、拉伸强度、弯曲强度和结晶度的影响.结果表明,未经表面处理的超微粉煤灰粒子可在聚乙烯中均匀分散;随着UFA含量从0phr增加至80phr,复合体系的刚性提高、结晶度增加,伸长率下降,但拉伸强度下降甚微(从21.76 MPa减少至19.65 MPa).复合材料的冲击强度在超微粉煤灰添加量为60phr时从纯树脂的27.64 J/m2提高到60.54 J/m2,有大幅度的增加,超微粉煤灰具有明显的刚性粒子增韧作用.

关键词: 超微粉煤灰 , 高密度聚乙烯 , 复合材料 , 增韧

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