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, 4.02% and 455 MPa, respectively. Key words: Al 2519 matrix composites; surface modification; Ti-coated SiCp; powder metallurgy; interfacial microstructure; mechanical properties 1 Introduction... reinforced Al 2519 matrix by powder metallurgy have not been fully investigated. In this work, an evaporation method under vacuum atmosphere was used to form a new structure of a Ti layer......
钴贮氢电极合金, 并在此基础上讨论了Al元素影响和改善过化学计量比快凝合金电极循环稳定性的微观机理. 1 实验 按化学式配比合金La(NiMn)α-xAlx (5<α<6, x为0~0.5 ), 在高纯Ar保护下用真空电弧炉熔练而成, 所用原材料纯度为: La 99.8%; Ni 99.95%; Mn和Al含量不小于99.5%. 为使合金成分均匀, 每个合金样经翻转重熔3次. 将母...电性能 Fig.3 High rate dischargeability HRD of quenched alloys hydride electrodes 快淬合金La(NiMn)α-xAlx在不同Al含量及淬速下电极的HRD如图3所示. 由图3可知, 在淬速为35m/s和1C(300mA/g)放电条件下, 随着Al含量增加, HRD从x=0.2时的96%下降至x=0.5时的......
in Figure 2(f). Figure 3 shows the EBSD image, EDS, and inverse pole figure of B4C/6061Al composites at three statuses. Nano-sized B4C particles mainly distribute at the Al particle boundary for as-SPSed...) is an intermetallic mainly composed of Al, Si, and Mg, which seems to form during the aging treatment, as shown in Figure 3(e). In sum, the atomic ratio shown in Figure 3(e) can prove that the white......
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to assure the presence of fullerenes in the composite and to check the damage level of fullerenes. Figure 3 shows the Raman spectra for a simple mixture of 2% (volume fraction) fullerene soot aluminum powder... particles (~1 μm in diameter) by planetary milling. Second, primarily ball-milled fullerenes are dispersed in aluminum powder via attrition milling. Finally, aluminum/fullerene composite powder......
and density of states 表3 吸附Al原子的本征(5,5)型碳纳米管布居数分析 Table 3 Population analysis of pristine (5,5) CNT adsorbing Al atom 表4 吸附Al原子的掺Fe(5,5)型碳纳米管布居数分析 Table 4 Population analysis...化学键[24].在本征和掺Fe(5,5)型碳纳米管吸附Al原子后的Mulliken布居分析研究中,通过对Al原子与本征碳纳米管和掺Fe碳纳米管的电荷转移情况分析,可进一步了解Al原子的吸附情况.研究表明,对掺杂体系而言,掺杂Fe原子及周围原子的电荷分布发生了较大变化.表3所列为本征(5,5)型碳纳米管吸附Al的布居数,其中Al原子与最近的3个C原子的平均距离为0.234 nm,布居数为0.07......
.HE等[37]采用沉积-沉淀法在铝粉基体上获得均匀分散的活性Ni纳米颗粒,以该Ni-Al粉末为催化剂,利用化学气相沉积法原位合成形态好,纯度高,分散均匀的CNTs,获得CNTs(Ni)-Al复合粉末. 3 CNTs-金属复合块体材料的制备 制备CNTs增强金属基复合材料首先应该考虑的问题是CNTs在金属基体中的分散性以及与基体的结合性.目前,通常采用的方法主要有粉末冶金烧结法...强Cu基或Al基复合材料是未来铜材或铝材方面最具潜力的发展方向之一.在本研究中,综述了近几年在CNTs增强Cu基和Al基复合材料研究方面取得的进展,论述CNTs的预处理,CNTs-金属复合粉末的制备,CNTs-金属复合块体材料的制备,界面结合机制以及CNTs的强化机理5个主要方面. 关键词:碳纳米管；Cu基复合材料；Al基复合材料；制备方法；增强机理 中图分类号:TB333 ......
at 1 200 ℃ for 1.5 h 由图3还可看出,随初始原料中Al含量的增加,B4C-AlB12-Al复合材料的抗弯强度亦先增加后降低.强度是由陶瓷-金属复合材料体内对裂纹扩展的抵抗能力决定的.在断裂应力的作用下,裂纹主要是通过晶界传播,即发生晶间断裂.李青等[8]的研究表明,经1 200 ℃烧结0.5 h时,Al金属侵蚀B4C陶瓷形成富铝中间产物,该...文章编号:1004-0609(2009)09-1594-07 Al含量对B4C-AlB12-Al复合材料性能的影响 薛向欣1, 2, 3,王东山1, 2, 3,张 莹1, 2, 3 (1. 东北大学 材料与冶金学院,沈阳 110004； 2. 东北大学 辽宁省高校硼资源生态化综合利用技术与硼材料重点试验室,沈阳 110004； 3. 东北大学 辽宁省硼资源综合开发利用工程技......
process, metal powder is often considered a kind of time-independent, elasto-plastic and compressible material[4,5]. KUHN et al[6], GREEN et al[7], SHIMA et al[8] and DORAIVELU et al[9] postulated.... Simulating powder compaction is capable of improving powder metallurgy component in an efficient and accurate manner. 3) The more ambitious goal is to predict tool deformations and stresses, optimize......
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