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纯Cu和低层错能的Cu-30%Zn(质量分数)合金进行室温多向压缩变形及退火实验,并利用OM,SEM/EBSD,TEM技术及电子万能试验机对其在变形和退火过程中的晶粒细化情况和不同累积变形量(Σε)后的拉伸力学性能进行观察和分析.结果表明:在多向压缩过程中,随着层错能的降低,铜合金的晶粒细化机制由传统的连续动态再结晶(cDRX)细化机制转变成孪晶分割晶粒细化机制.在变形过程中,两者的真应力-累积应...度以及变形后的强度也远大于纯Cu的.经Σε=2.4多向压缩变形后,在退火过程中,层错能较低的Cu-30%Zn合金再结晶晶粒明显比纯Cu细小,这是由于其内部层错密度较大,再结晶形核点较多所致. 关键词:铜合金;层错能;晶粒细化;孪晶;再结晶 中图分类号:TG146.1 文献标志码:A 细化晶粒通常能提高金属材料的塑性和强度.剧烈塑性变形(SPD)作......
the recovery of nickel and cobalt from the leaching solution of the alloy scraps with hydrochloride acid by the solvent extraction and the separation of Co(Ⅱ) from Ni in the chloride solutions using... was found to be 24.85 g/L Co, 12.55 g/L Ni, 28.62 g/L Fe, 13.97 g/L Cr, and 0.44 g/L Cu. In comparison with the chemical composition of the alloy scraps, 62% of Co, 96% of Ni, 99% of Fe, 78% of Cr and 98......
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Microstructure and synthesis mechanism of Al-Ti-C-Sr master alloy ZHAO Hong-liang(赵红亮), WANG Jun(王 军), SONG Yong(宋 勇), GUAN Shao-kang(关绍康) School of Materials Science and Engineering, Zhengzhou...; Abstract: Al-5Ti-0.5C-8Sr (mass fraction, %) master alloy was prepared using a melt reaction method. The microstructure and synthetic......
文章编号: 1004-0609(2006)06-0999-07 磷元素对铜基金属粉末选区激光烧结作用机理 顾冬冬, 沈以赴 (南京航空航天大学 材料科学与技术学院, 南京 210016) 摘 要: 对不同CuP含量的多组分铜基金属粉末(Cu-CuSn-CuP)进行了选区激光烧结实验. 利用X射线衍射和扫描电镜研究了添加元素P对烧结致密度及显微组织的影响. 研究表明: P元素能在烧结过程中充当脱氧剂而与Cu反应生成CuPO3; 但当P过量时, 则会因熔体过热倾向明显而加剧氧化; 适量增加P元素能改善烧结件层间结合性; 而P元素过量则会因生成过多磷渣而降低润湿性及致密度; P元素亦能充当稀释剂而降低熔体粘度及表面张力, 从而改善烧结致密度及组织均匀性; 但若P元素过量时, 则会因熔体粘度过低而导致球化现象. 实验结果证实, 该组铜基金属粉末体系中CuP的最佳含量为15......
Homogenization on microstructure and mechanical properties of 2A50 aluminum alloy prepared by liquid forging DU Zhi-ming1, 2, 3, CHEN Gang1, HAN Fei1, CAO Guang-xiang1, LIU Jun1, LI Hong-wei3, 4... on microstructure and mechanical properties of 2A50 aluminum alloy prepared by liquid forging was investigated. Wheel hubs were produced using direct and compound loading. The results show that the microstructure......
Microstructure and properties of high silicon aluminum alloy with 2% Fe prepared by rheo-casting ZHONG Gu(钟 鼓), WU Shu-sen(吴树森), AN Ping(安 萍), MAO You-wu(毛有武), LI Shi-zhao(李世钊) State Key... of Al-20Si-2Fe-2Cu-0.4Mg-1.0Ni- 0.5Mn alloy produced by semi-solid rheo-diecasting were studied. The effects of the modified microstructure on the mechanical properties were also investigated. 2......
稳定性;电阻率 中图分类号:TM 241.1 文献标识码:A Effect of chromium dopant on microstructure and resistivity characteristics of Cu/Si(100) systems WANG Xin-jiang, LIU Jia-cong, HONG... to investigate effects of Cr on the microstructure and resistivity characteristics of Cu/Si systems. X-ray diffraction reveals Cu(111) and Cu(200) peaks for Cu and Cu(Cr) films. However, Cu(Cr) films......
渐增多,钎料合金性能下降. 关键词:Bi5Sb钎料合金;Cu;润湿性能;力学性能 中图分类号:TG 405 文献标识码:A Effect of content of Cu on wettability and mechanical property of Bi5Sb solder alloy YAN... of Cu into Bi5Sb solder alloy to improve its wettability and mechanical properties. The results show the effect of adding 0.5%?5.0% (mass fraction) Cu into Bi5Sb on the melting point of Bi5Sb solder alloy......
胶-凝胶法分别制备未掺杂和钴掺杂TiO2溶胶,室温下将其分别与三乙胺反应制得氮掺杂和(Co, N)共掺杂的TiO2溶胶,然后通过浸渍-提拉法在钛片上成膜,经烧结获得掺杂光电极.采用XRD,SEM,XPS和紫外-可见光谱和光电流作用谱等对电极进行表征,并探讨其光电响应机理.结果表明:TiO2共掺杂后并未引起TiO2能带边缘位置发生明显改变,N主要以NOx形式掺杂;(Co, N)共掺杂TiO2薄膜电极...催化性能.已有报道显示钴[5]和氮元素[4, 10]的单掺杂具有较好的可见光催化活性.为进一步提高薄膜的可见光电响应性能,本文作者采用共掺杂的方法制备(Co, N)共掺杂TiO2电极,对其进行XRD,SEM,XPS等表征,对其光电性质进行较为系统的研究,探讨其光电响应提高的可能机理.迄今为止这种采用金属和非金属共同掺杂的方法来提高电极的可见光电响应的研究未见报道. 1 实验 1.1......