Chun-Nian He
,
Chao Feng
,
Ji-Chuan Lin
,
En-Zuo Liu
,
Chun-Sheng Shi
,
Jia-Jun Li
,
Nai-Qin Zhao
金属学报(英文版)
doi:10.1007/s40195-016-0376-3
Carbon nanotube (CNT)-reinforced 6061Al alloy matrix composites were prepared by chemical vapor deposition (CVD) combined with hot extrusion technique. During the preparation process, the 6061Al flakes obtained by ball milling of the 6061Al spherical powders were subjected to surface modification to introduce a hydrophilic polyvinyl alcohol (PVA) membrane on their surface (6061Al@PVA) to bond strongly with nickel acetate [Ni(II)]. Then the 6061Al@PVA flakes bonded with Ni(II) were calcined and reduced to Ni nanoparticles, which were then heat-treated at 580 °C to remove PVA for obtaining even Ni/6061Al catalyst. After that, the as-obtained Ni/6061Al catalyst was employed to synthesize CNTs on the surface of the 6061Al flakes by CVD. After hot extrusion of the CNT/6061Al composite powders, the as-obtained CNT/6061Al bulk composites with 2.26 wt% CNTs exhibited 135% increase in yield strength and 84.5% increase in tensile strength compared to pristine 6061Al matrix.
关键词:
Metal
,
matrix
,
composites
,
(MMCs)
,
Microstructure
,
Mechanical
,
properties
,
Carbon
贺微波金明赵永利
材料研究学报
应用热粘弹性理论和Voigt混合律, 在变温场中针对马氏体逆相变过程建立了 NiTi形状记忆纤维热粘弹性基体复合材料的应力--应变关系. 在逆相变过程和基体呈现热粘弹态阶段, 由于基体松弛其模量减小, 在跃阶拉应力的作用下, 复合材料的压缩应变迅速增大, 纤维回复应力先增大后减小; 在跃阶拉应变的作用下, 复合材料的应力增加先变缓然后加快直至稳定. 较高的温度和材料参数对NiTi纤维热粘弹性基体复合材料的力学行为和纤维的作动性能有明显的影响.
关键词:
复合材料
,
mechanic behavior
,
thermoviscoelasticity
,
NiTi fiber
,
matrix
,
relaxation modulus
Q.J. Zhu
,
Y.H. Chen
,
J. Chen
金属学报(英文版)
With the increasingly use of FRC (fiber-reinforced composite) in urban lifelines, mechanical properties investigation is very important for disaster resistance, especially
the investigation of fatigue properties. Based on the shear-lag model, an usual composite model under cyclic loading is established. According to the Paris formula, the
relationship between interfacial fatigue parameters and the number of cycles is obtained under the cyclic loading. Interfacial fatigue properties of this model and the
growth of the interfacial fatigue crack are analyzed. And the Poisson ratio is considered also.
关键词:
interfacial debonding
,
null
,
null
,
null
,
null
Ji-Hun PAK
,
Gwi-Nam KIM
,
Sung-Gu HWANG
,
Beom-Su KIM
,
Jung-Pil NOH
,
Sun-Chul HUH
中国有色金属学报(英文版)
doi:10.1016/S1003-6326(16)64356-X
碳纳米管因具有优异的电学、力学和热力学性能而被应用于各个领域。利用挤压工艺球磨Cu?CNT粉末制造复合材料，根据CNT的含量评估Cu?CNT复合材料的力学性能。采用行星式球磨机在500 r/min下混合分散CNT (1%,5%和10%)、铜(d=100 nm)、氧化锆球(90 g)和乙醇(20 mL)5min。用铜制造直径50 mm、长100 mm的坯锭，在单轴压力下将复合材料粉末填入坯锭。在挤压过程中，坯锭在880°C下加热1h后，坯锭负载200t，得到圆棒状样品。采用粒度分布仪测量复合材料的粒度，同时采用 SEM 观察挤压样品的表面组织。使用压痕仪测量的力学性能随着CNT含量的增加而提高。Cu?CNTs复合材料的屈服强度、抗拉强度和硬度明显提高。
关键词:
碳纳米管
,
挤压
,
球磨
,
压痕
,
基体
,
力学性能
,
显微组织
李祖来
,
蒋业华
,
周荣
,
陈志辉
,
山泉
材料热处理学报
采用真空实型铸渗(V-EPC)工艺制备碳化钨颗粒增强铁基表层复合材料,观察并研究其基体组织和抗三体磨料磨损性能.结果表明,基体组织的变化对复合材料的磨损性能产生显著的影响,随着Cr含量的增大,复合材料基体组织中的碳化物含量增加,形貌由长条状向块状转变.而复合材料的三体磨料磨损性能随着Cr含量的增大呈增加趋势,与未添加Cr的表层复合材料相比,当基体中Cr含量为27.4％时,表层复合材料的三体磨料磨损性能提高了40.6％.Cr的添加可提高WCp/铁基表层复合材料三体磨料磨损性能的机制为双“阴影效应”和“支撑效应”的协同作用.
关键词:
颗粒增强复合材料
,
磨料磨损
,
真空实型铸造
,
基体组织
郭兴忠
,
杨辉
,
程本军
稀有金属材料与工程
对刚玉-莫来石基质在1550～1700℃烧成4 h,研究其α-Al2O3添加量对刚玉-莫来石基质性能的影响规律.研究结果表明,刚玉-莫来石基质是通过液态SiO2和原料中SiO2与α-Al2O3反应生产的莫来石相进行致密,1650℃是基质的烧成温度转折点,超过此温度,莫来石相发生分解形成无定性SiO2,将影响基质的结构及性能.基质的体积密度和强度随烧成温度和α-Al2O3添加量的增加而增大,并高于刚玉-莫来石窑具材料.随着α-Al2O3添加量的增加,基质的主要断裂方式由穿晶断裂向沿晶断裂方式转变.基质的抗热震性能随烧成温度和α-Al2O3添加量的增加而降低,烧成温度和α-Al2O3添加量是基质抗热震性能主要影响因素.
关键词:
刚玉
,
莫来石
,
氧化铝
,
基质
,
耐火材料
,
热震
李宁
,
朱伯铨
,
李享成
稀有金属材料与工程
研究了三聚磷酸钠、聚乙二醇和分散氧化铝3种分散剂对刚玉细粉-铝酸钙水泥-硅微粉和刚玉细粉-α-Al_2O_3微粉-Al_2O_3/SiO_2凝胶粉组成的2种刚玉质浇注料基质浆体流变特性的影响.采用NXS-11A型旋转粘度计测定了2种浆体在不同剪切速率(D_s)下的剪切应力(τ),计算了相对应的粘度(η),根据料浆的τ-D_s和η-D_s曲线,确定了料浆的流变特性.研究结果表明:在刚玉细粉-铝酸钙水泥-硅微粉混合浆体中,三聚磷酸钠和聚乙二醇的分散效果较好,且合适的加入量分别为0.1%和0.05%～0.1%;在刚玉细粉-α-Al_2O_3微粉-Al_2O_3/SiO_2凝胶粉混合浆体中,ADW1的分散效果较好,且最佳加入量为0.25%左右.
关键词:
基质
,
ζ电位
,
流变特性
,
分散剂
,
浆体
