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of oxygen on the mechanical properties and microstructures of titanium alloys are of considerable importance. WHITTAKER et al [3] and YAN et al [4] reviewed the dependence of mechanical properties...: Wiley-VCH, 2003: 333-423. [3] WHITTAKER D. Powder processing, consolidation and metallurgy of titanium [J]. Powder Metall, 2012, 55(1): 1-11. [4] YAN M, XU W, DARGUSCH M S, TANG H P, BRAND M, QIAN M......
that hindered the improvement of graphene/Al composites’ properties [5,32]. Up to now, a majority of graphene/Al composites have been produced by powder metallurgy (PM). LI et al [15] developed..., demonstrating a promising method for fabricating high-content GNPs/Al composites. 2 Experimental Al powder (purity ≥99.99%) with an average diameter of ~10 μm was supplied by Tianjiu Changsha......
J. Cent. South Univ. (2012) 19: 1773-1779 DOI: 10.1007/s11771-012-1206-z Effect of inclusion on high cycle fatigue response of a powder metallurgy tool steel YAO Jun(姚君)1,2, QU Xuan-hui(曲选辉)1,2, Rafi... fatigue response of a high V-alloyed powder metallurgy tool steel (AISI 11) with different inclusion sizes was studied. Two materials of this grade at a similar hardness of about HRC 60 were subjected......
, ZARINEJAD M, DEAN T A. Equal channel angular pressing-forward extrusion (ECAP-FE) consolidation of Al particles[J]. Materials & Design, 2009, 30(3): 429-432. [5] 李 萍, 薛克敏, 周明智. 铝粉烧结材料等通道转角挤压组织性能演变[J...:A Microstructures of pure Al powder consolidate using equal channel angular pressing and torsion after single pass LI Ping, WANG Xiao-xi, XUE Ke-min, ZHANG Xiang, WANG Xue (School of Materials Science......
工业Al(OH)3热分解行为研究赵春芳中国铝业股份有限公司郑州研究院 河南郑州450041摘 要:本文利用综合热分析仪对不同性能Al(OH)3进行热分解行为分析,同时利用扫描电子显微镜,激光粒度仪对试验样品进行微观结构和粒度分布分析,深入研究了Al(OH)3热分解过程中样品特性对热分解行为的影响,为Al(OH)3焙烧制取多品种氧化铝提供参考.关键词:Al(OH)3;粒度;热分解;微观结构;......
. The specified composition of the as-received pure aluminum powder was as follows: w(Al)>99.0%, w(Fe)<0.60%, w(Cu) <0.05%, w(Si)<0.3%. Initial aluminum powder particles were of near spherical shape as shown in Fig. 3(b) and had an average diameter of 40.6 mm. MoS2 was used as a lubricant. Pure aluminum cans were filled with aluminum powder particles (initial packing density of 75......
-discharge curves (a) and cycle performances (b) of Li4Ti5-xAlxO12 samples 从图3(b)中看,所有掺杂样品因颗粒粗大导致高倍率下的充放电比容量迅速降低；但由于Al-O八面体很稳定,使样品循环稳定性能很好,容量保持率均在98%以上. 图4所示为不同掺杂铝量样品Li4AlxTi5-xO12的交流阻抗谱图.图中高中频区的半圆反...料熔点有所降低,与ZHAO等[13]报道的相同. 2.3 电化学性能测试 图3所示为不同掺铝量合成样品的首次充放电曲线和循环性能曲线.从图3(a)可以看出,未掺杂材料0.1 C倍率下首次充电比容量为161.6 mA·h/g,与锐钛型TiO2为钛源合成材料的性能相当[19-20],说明对于高温固相反应而言,钛源TiO2的形态对合成材料的性能影响不大.与未掺杂样品比较,所有掺Al3+样......
且过大压力会造成造孔剂的破碎变形.然而,当铝粉在接近熔融状态施加压力(烧结压力)时,可轻易破坏铝粉表面的氧化膜,产生金属间的接触而实现铝粉颗粒间的冶金结合,改善烧结试样的力学性能. 表1 多孔铝的制备实验参数 Table 1 Experimental parameters of porous Al fabrication 图3所示为烧结压力对抗弯强度的影响,未施加烧结压力... on bending strength (samples with porosity of 61% and average pore diameter of 230 μm) 图4(a)所示为与图3中点b对应的多孔铝的微观组织,可见铝粉颗粒之间结合良好,无明显的空隙存在,烧结颈明显.图4(b)所示为与图3中点d对应的多孔铝的微观组织,可见其中有大量铝液在Al-NaCl界面溢出,形成了不连续的表面缺陷,并导致基体......
is the Bragg angle [17]. Fig. 3 XRD profiles of 1%CNTs/Al-2024 powder milled for different time It is well known that PCA can prevent particles from cold wedding. In this experiment, stearic acid and methanol..., bundles of entangled CNTs are found, as shown in Fig. 7(a), whereas Fig. 7(b) shows some CNTs dispersed on the surface of Al alloy powder. Carbon nanotubes are observed being embedded between......
子扩散的结果.Al的熔点为660 ℃,与Cu和Ni 的熔点差距较大.低熔点金属有较低的表面能和较高的自扩散率,因此,不同扩散速率产生不等量扩散,引起孔隙增大和烧结样品的体积增大.另外,在600 ℃左右烧结时,合金内开始产生液相,导致烧结膨胀的反致密化现象出现. 图3所示为铝白铜合金的相对密度及开孔率随烧结温度的变化.可以看到:在500~800 ℃之间时,烧结膨胀发生,相对密度下降,开孔率增加；在... behavior and expansion mechanism of Cu-Ni-Al powder alloy FENG Ying, LI Yi-min, HE Hao, ZENG Zhao-yi (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China......
