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Microstructure and Mechanical Properties of 45 vol.%SiC_p/7075Al Composite

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Journal of Materials Science & Technology 2015年第9期31卷 930-934页

作者： Ziyang Xiu Wenshu Yang Ronghua Dong murid hussain Longtao Jiang YongXing Liu Gaohui Wu State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Department of Material Science and Engineering Harbin Institute of Technology Department of Chemical Engineering COMSATS Institute of Information Technology

Microstructure and mechanical behavior of high volume content SiCp/7xxxAl composites have not been explored yet. Therefore, in the present work, 45 vol.% SiCp/7075Al composite has been prepared by pres- sure infiltration method. High density dislocations were found around SiC/Al interface in SiCp/7075Al composite after water-quenching and aging treatment. Fine dispersed nano-η＇ phases were observed after the aging treatment. Adverse to other SiCp/Al composites prepared by the pressure infiltration method, an interface layer was observed between SiC particles and AI matrix. Furthermore, high-resolution trans- mission electron microscopy （HRTEM） observation indicated that this interface layer was coherent/semi- coherent with that of the SiC particles. 45 vol.% SiCp/7075Al composite demonstrated high tensile strength （630 MPa） and micro-ductility. Compared to aged SiCp/2024Al composite, the aged SiCp/7075Al com- posite showed an increase of about 200% in the tensile strain and 90% in the tensile strength, respectively. It is speculated that nano-η＇ phases in the Al matrix significantly contributed to the strengthening effect while the interface layer between SiC and AI matrix might be beneficial to the strength and plasticity of SiCp/7075Al composite.

关键词： Metal matrix composite7075Al InterfaceNano precipitationMechanical properties

Research progress on the characterization and repair of graphene defects

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1179-1190页

作者： Bo-yu Ju Wen-shu Yang Qiang Zhang murid hussain Zi-yang Xiu Jing Qiao Gao-hui Wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Department of Chemical Engineering COMSATS University IslamabadLahore CampusDefence RoadOff Raiwind RoadLahore 54000Pakistan State Key Laboratory of Advanced Welding and Jointing Harbin Institute of TechnologyHarbin 150001China

Graphene has excellent theoretical properties and a wide range of applications in metal-based composites. However, because of defects on the graphene surface, the actual performance of the material is far below theoretical expectations. In addition, graphene containing defects could easily react with a matrix alloy, such as Al, to generate brittle and hydrolyzed phases that could further reduce the performance of the resulting composite. Therefore, defect repair is an important area of graphene research. The repair methods reported in the present paper include chemical vapor deposition, doping, liquid-phase repair, external energy graphitization, and alloying. Detailed analyses and comparisons of these methods are carried out, and the characterization methods of graphene are introduced. The mechanism, research value, and future outlook of graphene repair are also discussed at length. Graphene defect repair mainly relies on the spontaneous movement of C atoms or heteroatoms to the pore defects under the condition of applied energy. The repair degree and mechanism of graphene repair are also different according to different preparations. The current research on graphene defect repair is still in its infancy, and it is believed that the problem of defect evolution will be explained in more depth in the future.

关键词： graphene metal matrix composites defect repair characterization repair mechanism

Electrical Discharge Machining of Al2024-65 vol%SiC Composites

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Acta Metallurgica Sinica(English Letters) 2017年第5期30卷 447-455页

作者： Wen-Shu Yang Guo-Qin Chen Ping Wu murid hussain Jia-Bing Song Rong-Hua Dong Gao-Hui Wu Department of Materials Science and Engineering HarbinInstitute of TechnologyHarbin 150001China Northwest Institute of Nuclear Technology Xi'an 710024China Department of Chemical Engineering COMSATS Instituteof Information TechnologyM.A.Jinnah BuildingDefenceRoadOff Raiwind RoadLahore 54000Pakistan Beijing Institute of Aerospace Control Devices Beijing 100039China

In the present work, the wire electrical discharge machining（WEDM） process of the 65 vol% SiCp/2024 Al composite prepared by pressure infiltration methods has been investigated. The microstructure of the machined composite was characterized by scanning electron microscope, the average surface roughness（Ra）, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy（TEM） techniques. Three zones from the surface to the interior（melting zone, heat affected zone and un-affected zone） were found in the machined composites, while the face of SiC particles on the surface toward the outside was ‘‘cut＇＇ to be flat. Increase in Al and Si but decrease in C and O were observed in the core areas of the removed particles. Si phase, which was generated due to the decomposition of SiC, was detected after the WEDM process. The irregular and spherical particles were further observed by TEM. Based on the microstructure observation, it is suggested that the machining mechanism of 65 vol% SiCp/2024 Al composite was the combination of the melting of Al matrix and the decomposition of SiC particles.

关键词： Metal matrix composites SiCp/Al composite Metal infiltration Wire electrical discharge machining(WEDM) SiC decomposition Machining mechanism

Microstructural evolution and thermal conductivity of diamond/Al composites during thermal cycling

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1821-1827页

作者： Ping-ping Wang Guo-qin Chen Wen-jun Li Hui Li Bo-yu Ju murid hussain Wen-shu Yang Gao-hui Wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Qiqihar Xiangke New Material Co. Ltd.Qiqihar 161005China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology School of Material Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Beijing Institute of Spacecraft System Engineering Beijing 100094China Department of Chemical Engineering COMSATS University IslamabadLahore CampusDefence RoadOff Raiwind RoadLahore 54000Pakistan

The microstructural evolution and performance of diamond/Al composites during thermal cycling has rarely been *** the present work,the thermal stability of diamond/Al composites during thermal cycling for up to 200 cycles was ***,the thermal conductivity(λ)of the composites was measured and scanning electron microscopy of specific areas in the same samples was carried out to achieve quasi-in situ *** interface between the(100)plane of diamond and the Al matrix was well bonded with a zigzag morphology and abundant needle-like Al4C3 *** contrast,the interface between the(111)plane of diamond and the Al matrix showed weak bonding and debonded during thermal *** debonding length increased rapidly over the first 100 thermal cycles and then increased slowly in the following 100 ***λof the diamond/Al composites decreased abruptly over the initial 20 cycles,increased afterward,and then decreased monotonously once more with increasing number of thermal *** in theλof the Al matrix and the corresponding stress concentration at the diamond/Al interface caused by thermal mismatch,rather than interfacial debonding,may be the main factors influencing the decrease inλof the diamond/Al composites,especially in the initial stages of thermal cycling.

关键词： metal-matrix composites diamond stability thermal mismatch stress

Deformation treatment and microstructure of graphene-reinforced metal matrix nanocomposites: A review of graphene post-dispersion

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 888-899页

作者： Yong Mei Pu-zhen Shao Ming Sun Guo-qin Chen murid hussain Feng-lei Huang Qiang Zhang Xiao-sa Gao Yin-yin Pei Su-juan Zhong Gao-hui Wu State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Institute of Defense Engineering AMSPLABeijing 100036China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of Chemical Engineering COMSATS University IslamabadLahore CampusLahore 54000Pakistan State Key Laboratory of Advanced Brazing Filler Materials&Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou 450001China

Graphene/aluminum(Gr/Al)composites have attracted the attention of researchers all over the world due to their excellent ***,graphene agglomerates easily because of the van der Waals force between graphite sheets,thereby affecting the performance of the *** the agglomeration of graphene and dispersing it uniformly in the Al matrix is a key *** the preparation process,predispersion treatment and deformation treatment can play important roles in graphene *** have conducted a series of research and literature reviews of the graphene predispersion and consolidation of ***,they paid less attention to post-deformation *** review summarizes different deformation treatments involved in the preparation process of Gr/Al composites and the evolution of the microstructure during the *** on deformation parameters is expected to further improve the properties of Gr/Al composites and would provide a deep understanding of the strengthening effect of graphene.

关键词： graphene/aluminum composites deformation treatment dispersion microstructure

压力浸渗法制备Si_3N_(4p)/2024Al复合材料的时效和热膨胀行为(英文)

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中国有色金属学会会刊：英文版 2011年第S2期21卷 262-273页

作者：陈国钦杨文澍马康 murid hussain 姜龙涛武高辉哈尔滨工业大学材料科学与工程学院哈尔滨150001 Department of Materials Science and Chemical Engineering

采用压力浸渗法制备Si3N4p/2024Al复合材料,并研究其时效和热膨胀行为。2024铝合金和Si3N4p/2024Al复合材料的峰时效时间及硬度均随着时效温度的升高而降低。激活能计算结果表明,在Si3N4p/2024Al复合材料中s′相析出比在2024铝合金中容... 详细信息

采用压力浸渗法制备Si3N4p/2024Al复合材料,并研究其时效和热膨胀行为。2024铝合金和Si3N4p/2024Al复合材料的峰时效时间及硬度均随着时效温度的升高而降低。激活能计算结果表明,在Si3N4p/2024Al复合材料中s′相析出比在2024铝合金中容易。Si3N4的加入,未改变析出相的析出顺序,但是加速了析出。在低于100℃时,Si3N4p/2024Al复合材料的热膨胀系数接近Kerner模型(即Schapery模型的上限)和Schapery模型的下限的平均值。由于低的内应力、弥散分布的Al2MgCu析出相对位错的强钉扎作用以及高密度缠绕的位错,时效处理后的Si3N4p/2024Al复合材料具有最好的尺寸稳定性。由于具有良好的力学性能和钢匹配的热膨胀数系以及优异的尺寸稳定性,Si3N4p/2024Al复合材料在惯性导航领域具有广阔的应用前景。

关键词： Si3N4 铝基复合材料时效热膨胀

Fertility Preservation Options for Cancer Patients

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Advances in Reproductive Sciences 2015年第4期3卷 67-74页

作者： murid Javed Essam Michael Astra Fertility Clinic Mississauga Canada

The number of reported new cancer cases is increasing every year. The probability of surviving cancer is high and is continually improving. The cancer treatment may induce ovarian or testicular failure by damaging ovarian follicles in females and spermatogonia in the males. Gonadal failure may affect all aspects of reproductive health, including pubertal development, hormone production, and sexual function in adult life. Therefore, the primary goal for cancer treatment is to ensure the highest possibility of cure and to maintain the reproductive health. The cancer patients should be provided with maximal chance to make an optimal decision without any significant impact and delay in cancer treatment. As a result of treatment innovations, the survival rates of young people have increased substantially;therefore, the need of fertility preservation has increased as well. The sperm cryopreservation and embryo cryopreservation have been standard methods of fertility preservation. Recently, the American Society for Reproductive Medicine has removed the experimental label from oocyte cryopreservation. However, other fertility preservation options including ovarian tissue and whole ovary cryopreservation and testicular tissue cryopreservation for pre-pubertal boys are still considered experimental. A coordinated approach by gynecologists, urologists, oncologists, pediatricians, surgeons, fertility specialists and counselors is required to make use of available fertility preservation options. Timely and complete information on the impact of cancer treatment on fertility and fertility preservation options should be presented to all patients when a cancer treatment is planned. The possibility of fertility preservation removes a huge concern and enables cancer patients to concentrate on their treatment and getting better. The purpose of this review is to present different options currently available to preserve fertility in men, women and adolescent children diagnosed with cance

关键词： Fertility Preservation Oocyte Cryopreservation Sperm Cryopreservation Ovarian Tissue Cancer