共搜索到68795条信息,每页显示10条信息,共6880页。用时:0小时0分0秒468毫秒
the strength of composites. Key words: 6066aluminum matrix alloy; SiC particles; surface treatment; mechanical properties 近年来,SiC增强Al基复合材料由于具有较高的比强度和比刚度,作为结构材料越来越受重视, 这些性能对质量要求高的部件,如航空,汽车及航海等方面的应用来说尤为重要....[10]傅敏士, 肖亚航. SiCp/Al复合材料的断裂行为[J].机械工程材料, 2001, 25(11): 17-18.FU Min-shi, XIAO Ya-hang. Fracture behavior of SiCp/Al matrix composites[J]. Materials for Mechanical Engineering, 2001, 25(11): 17-18.[11......
,因此研究铝酸钠溶液中氢氧化铝的溶解度与颗粒尺寸的关系是很有必要的.采用红外光谱仪,表面张力仪及接触角仪,测定和计算了Al(OH)3颗粒与铝酸钠溶液的固-液界面性质,并结合Ostwald熟化公式,对铝酸钠溶液中Al(OH)3溶解度与其颗粒尺寸之间的关系以及临界核尺寸的变化规律进行了分析.结果表明:三水铝石细粒子的溶解度大于粗粒子的溶解度,且其临界核尺寸随着碱浓度,苛性比及温度的升高而增大,细粒子的存在是限制晶种分解程度的重要因素. 关键词:铝酸钠溶液;Al(OH)3;界面性质;溶解度;临界核尺寸 (Edited by Hua YANG) Foundation item: Project (51274242) supported by the National Natural Science Foundation of China Corresponding author: Dong......
Microstructure and properties of ultra-fine tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering LI Xiao-qiang(李小强), XIN Hong-wei(辛红伟), HU Ke(胡 可), LI...: The microstructure and properties of the 93W-4Ni-2Co-1Fe (mass fraction, %) tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering from mixed elemental powders were......
Fabrication of Bulk(Fe,Cr)3Al/Al2O3 Intermetallic Matrix Nanocomposite Through Mechanical Alloying and SinteringSayyed Erfan Aghili,Mohammad Hossein Enayati,Fathallah KarimzadehDepartment... of powder particles during mechanical alloying were studied by X-ray diffraction. The microstructure and the morphology of powder particles and bulk samples were also studied by scanning electron......
Influence of Alloying Element Addition on Cu–Al–Ni High-Temperature Shape Memory Alloy without Second Phase FormationXin Zhang,Qing-Suo LiuSchool of Materials Science and Engineering, Tianjin... of the magnitude smaller than that of Cu–11.9Al–3.8Ni alloy.The compression test results proved that the mechanical properties of Cu–11.9Al–3.8Ni alloy were dramatically improved by alloying element......
Al元素对316L不锈钢组织和室温力学性能的影响喇培清1,李玉峰2,刘闪光2,申达2,王鸿鼎2(1.甘肃省兰州市兰州理工大学有色金属新材料国家重点实验室2.兰州理工大学 有色金属新材料国家重点室培育基地,甘肃兰州 730050)摘 要:通过WS-4非自耗真空电弧炉熔炼制备了加铝的质量分数为2%~10%的不锈钢316L,用光学金相显微镜观察了金相组织,用EPMA-1600电子探针分析了组织中各元素的分布,结合D8 ADVANCE型X射线衍射确定了合金中的基体相组成,并研究了室温压缩性能和硬度.结果表明:随着铝含量增加,碳化物由连续条状转变为质点状;铝元素固溶于合金基体中,当铝的质量分数小于6%时,基体相为γ相;当铝的质量分数大于6%时,基体相转变为α相,此时合金脆性大幅提高,合金由塑性材料转变为脆性材料......
......
.BIRT等[1]的研究结果表明,在Al-Mg-Li合金中添加少量的Sc元素,可以大幅度提高合金的屈服强度,由于在铝合金中加入Sc元素后形成的Al3Sc粒子[2-3],不仅起到弥散强化作用,而且可以起到阻碍再结晶和细晶强化的作用.在Al-Li合金中添加Cu元素会大幅提高合金强度,由于添加Cu元素之后,合金经过时效会析出大量的T1(Al2CuLi)相,该相具有很好的钉扎位错的作用[4],从而强化合金性能.但是,有研究表明[5],在高Cu铝合金中添加Sc元素后会形成W相(AlCuSc相),而降低合金强度.GAZIZOV等[6]在研究Al-Cu-Mg-Ag-Sc体系合金的组织演变过程时,发现合金在均匀化之后形成了典型的W相.JIA等[7]在Al-4Cu-Li合金中添加Sc元素后也发现了AlCuSc三元相(W相).但在低Cu或者无Cu的Al-Li合金中添加Sc元素之后,Sc元素往往形成Al3Sc粒子......
by mechanical alloying (MA) from elemental powders has been investigated. The results of XRD and SEM analyses of the powder show that Ti5Si3 can be synthesized by MA in a planetary mill with two different...Formation mechanism of Ti5Si3 powder by mechanical alloyingPengchao Kang, Zhongda Yin, Yue Jiang, Mingwei Li Materials Science and Engineering School, Harbin Institute of Technology, Harbin 150001......
. The mechanical and wear properties of hybrid aluminium metal matrix composites were investigated. Mica and SiC ceramic particles were incorporated into Al 356 alloy by stir-casting route. Microstructures... and burr height compared with aluminium/ceramic composites. 10% (volume fraction) SiCp/Al-Mg composites with different Mg contents were successfully fabricated by semi-solid mechanical stirring......