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冷变形
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  cold deformation
Evolution of dislocation boundaries during cold deformation of microcrystalline titanium
      
The evolution of the misorientation spectrum of titanium during cold deformation via uniaxial tension was analyzed.
      
Using metals as an example, we have determined the dependences of the variation of dimensions and areas of fragments and grains on the parameters of large cold deformation.
      
On the possibility of formation of domains with {110}?001? orientation during cold deformation of commercial Fe-3% Si alloy
      
Dissolution of the Fe4N nitride in the nitrided layer of iron upon cold deformation by shear under pressure
      
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This paper throws light upon the effects on the critical current density Jc by aging temperature, aging times, aging numbers, aging number setting and the final cold work quantity after the last aging. Properly co-ordinating and coupling the above-mentioned factors furnishes the key to obtaining the optimum critical current density. Proper selection of the experimental results of different factors brings about the optimum Jc of 4.0×105 A/cm2 (4.2 K, 5T). The Jc of the multifilament composite wire in small-amount...

This paper throws light upon the effects on the critical current density Jc by aging temperature, aging times, aging numbers, aging number setting and the final cold work quantity after the last aging. Properly co-ordinating and coupling the above-mentioned factors furnishes the key to obtaining the optimum critical current density. Proper selection of the experimental results of different factors brings about the optimum Jc of 4.0×105 A/cm2 (4.2 K, 5T). The Jc of the multifilament composite wire in small-amount trial production is 2.5-3.0×105 A/cm2 (4.2 K, 5T).

本文全面地研究了在冷加工和热处理多次交替进行中时效温度、时效时间、时效次数、次数分配、最后一次时效后最终冷变形量等对NbTi/Cu多芯复合线J_c的影响.以上各因素的适当地调整和匹配是获得最佳J_c的关键.选用适宜的各种因素的试验结果得到了最佳J_c=4.0×10~5A/cm~2(4.2K,5T).小批量试制的线材的J_c为2.5—3.0×10~5A/cm~2(4.2K、5T).

The structure,properties and hardening mechanism of a new type of high conductivityCu-Be-Ni alloys have been studied after deformationand aging The results show that cold deformationafter solid solution treatment accelerates the precip-itation process and disperses the precipitates,andmakes the alloy recrystallize during aging.The re-sult of precipitation and rectystallization impels thealloy to get a high strength and conductivity,Thegrains can be refined,strength increased,and con-ductibility kept on 50-60%IACS...

The structure,properties and hardening mechanism of a new type of high conductivityCu-Be-Ni alloys have been studied after deformationand aging The results show that cold deformationafter solid solution treatment accelerates the precip-itation process and disperses the precipitates,andmakes the alloy recrystallize during aging.The re-sult of precipitation and rectystallization impels thealloy to get a high strength and conductivity,Thegrains can be refined,strength increased,and con-ductibility kept on 50-60%IACS by adding Zr intothe alloy.

对系列新型高导电Cu-Be-Ni电极合金在不同变形量和时效后的组织、性能和强化机制进行了研究。结果表明,固溶处理后的冷变形促进了时效析出过程,使析出相更加弥散,同时使合金在时效过程中发生再结晶。两者交互作用使合金达到强度和导电性的良好配合。合金中加入Zr能显著细化晶粒,提高强度,并使电导率达50~60%IACS。

The atmospheric cast CuCr25 and CuCr25RE alloy contact material which were prepared by medium frequency induction furnace was studied.The microstructure of CuCr25 and CuCr25RE alloy after casting and forging were observed and compared by SEM.And the effect of rare earth(RE) on the electrical conductivity and softening temperature of CuCr25 alloy was discussed.The results show that the microstructure distributes homogeneously after forging,but with the addition of RE,Cr particles were refined obviously.And after...

The atmospheric cast CuCr25 and CuCr25RE alloy contact material which were prepared by medium frequency induction furnace was studied.The microstructure of CuCr25 and CuCr25RE alloy after casting and forging were observed and compared by SEM.And the effect of rare earth(RE) on the electrical conductivity and softening temperature of CuCr25 alloy was discussed.The results show that the microstructure distributes homogeneously after forging,but with the addition of RE,Cr particles were refined obviously.And after solution at 950℃ for 1h and aging at different temperature,the addition of RE improves the electrical conductivity of the alloy.Aged at 480℃ after 40% cold deformation,the value of electrical conductivity improves significantly compared with that without deformation.The RE additive improves the softening resistance,which can increase the softening temperature of CuCr25 alloy about 25℃.

在中频感应炉中用大气熔铸方法制备了CuCr25以及CuCr25RE合金触头材料,利用扫描电镜对其铸态及锻态的显微组织进行了观察和比较,并探讨了微量稀土对CuCr25电导率及软化温度的影响。结果表明:合金经锻造后可以获得均匀的组织分布,但添加稀土后Cr颗粒明显细化;合金添加稀土元素并经950℃×1h固溶,再在不同温度下进行时效处理,可有效地提高合金的电导率;对固溶后的CuCr25、CuCr25RE合金施以40%冷变形再进行480℃时效处理,其电导率较固溶后直接时效处理的有显著提高;添加微量稀土元素对合金的抗软化性能有所改善,使CuCr25合金的软化温度提高了约25℃。

 
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