检索结果-南通市图书馆

挤压速度对搅拌摩擦反挤压法制备Cu-5%Ti_(2)SnC复合丝材性能的影响

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2024年第3期34卷 935-951页

作者： Amirhossein JAHANI hamed jamshidi aval Mohammad RAJABI Roohollah JAMAATI Department of Materials Engineering Babol Noshirvani University of TechnologyShariati AvenueBabol 47148-71167Iran

对粉末冶金法制备的含5%(体积分数)Ti_(2)Sn CMAX相的初始复合材料进行搅拌摩擦反挤压(FSBE)处理,研究FSBE工艺的轴向横移速度对Cu-Ti_(2)Sn C复合线材显微组织、力学性能、电学性能和磨损性能的影响。结果表明,随着挤压速度的增加,显... 详细信息

对粉末冶金法制备的含5%(体积分数)Ti_(2)Sn CMAX相的初始复合材料进行搅拌摩擦反挤压(FSBE)处理,研究FSBE工艺的轴向横移速度对Cu-Ti_(2)Sn C复合线材显微组织、力学性能、电学性能和磨损性能的影响。结果表明,随着挤压速度的增加,显微组织中孪晶增多,Ti_(2)SnC颗粒细化,MAX相和Cu基体之间的界面结合改善。当转速为600r/min,轴向横移速度为25mm/min时,Cu-Ti_(2)SnC复合线材具有最大的硬度、屈服强度和极限抗拉强度,分别为HV 132.7、278.34MPa和485.15MPa,这是其更强的界面结合和更细的MAX相导致的。此外,当转速为600 r/min,轴向横移速度为25 mm/min时,Cu-Ti_(2)SnC复合丝的电导率最高,达到89.21%(IACS),磨损率最低,为0.0015 mg/m,这是其更大的晶粒尺寸、更强的界面结合与更低的密度导致的。

关键词：搅拌摩擦反挤压 Ti_(2)SnC MAX相铜基复合材料电导率

Microstructural evolution and mechanical properties of friction stir-welded C71000 copper–nickel alloy and 304 austenitic stainless steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第11期25卷 1294-1303页

作者： hamed jamshidi aval Department of Materials and Industrial Engineering Babol Noshirvani University of Technology

Dissimilar joints comprised of copper–nickel and steel alloys are a challenge for manufacturers in modern industries, as these metals are not thermomechanically or chemically well matched. The present study investigated the effects of tool rotational speed and linear speed on the microstructure and mechanical properties of friction stir-welded C71000 copper–nickel and 340 stainless steel alloys using a tungsten carbide tool with a cylindrical pin. The results indicated that a rotational-to-linear speed ratio of 12.5 r/mm did not cause any macro defects, whereas some tunneling defects and longitudinal cracks were found at other ratios that were lower and higher. Furthermore, chromium carbide was formed on the grain boundaries of the 304 stainless steel near the shoulder zone and inside the joint zone, directing carbon and chromium penetration toward the grain boundaries. Tensile strength and elongation percentages were 84% and 65% of the corresponding values in the copper–nickel base metal, respectively.

关键词： dissimilar friction stir welding copper–nickel alloy austenitic stainless steel microstructure mechanical properties

Microstructural characterization and mechanical properties of friction surfaced AA2024-Ag composites

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2020年第7期30卷 1756-1770页

作者： Parisa PIRHAYATI hamed jamshidi aval Department of Materials Engineering Babol Noshirvani University of TechnologyShariati AvenueBabol 47148-71167Iran

The effects of Ag on the microstructure, mechanical properties, and electrical conductivity of AA2024 aluminum alloy coating were investigated. It was fabricated by friction surfacing as an additive manufacturing process. To carry out this investigation, Ag was added by 5.3, 10.6, and 16.0 wt.% to an AA2024 consumable rod by inserting holes in it. It was found that due to the strengthening by solid solution and the formation of precipitates and intermetallic containing Ag, the driving force for grain growth is reduced and consequently the grain size of the coating is decreased. After artificial aging heat treatment, the electrical conductivities of the coatings containing 0 and 16.0 wt.% Ag are increased by 4.15%(IACS) and decreased by 2.15%(IACS), respectively. While considering a linear relationship, it can be proposed that for a 1 wt.% Ag increase, the strength and hardness of the coating will be increased by 1.8% and 1.0%, respectively. It was established that the effect of Al6(Cu,Ag)Mg4 precipitate formation on strengthening is greater than that of Ag-rich intermetallic.

关键词： friction surfacing AA2024 aluminum alloy Ag powder AA2024-Ag composite

Influence of rotational speed in friction surfacing of nickel-aluminide reinforced aluminum matrix composite on commercially pure aluminum

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第8期32卷 2480-2493页

作者： Mobina YOUSEFI hamed jamshidi aval Department of Materials Engineering Babol Noshirvani University of TechnologyShariati AvenueBabol 47148-71167Iran

The effect of rotational speed in the friction surfacing of nickel-aluminide reinforced Al-Zn-Mg-Cu alloy matrix composite on commercially pure aluminum was investigated. The nickel-aluminide reinforcement was fabricated by in-situ methods based on adding nickel powders to Al-Zn-Mg-Cu alloy melt during the semi-solid casting *** findings showed that an increase in the rotational speed from 600 to 1000 r/min raised the coating efficiency from 65% to 76%. Besides, there was no significant difference between coating efficiencies in the coating with and without nickel-aluminide. The outcomes showed that if the coating was applied at a rotational speed of 1000 r/min, a traverse speed of 100 mm/min, and an axial feeding rate of 125 mm/min, the hardness and shear strength of the substrate increased by up to 225% and 195%, respectively. But the wear rate of the substrate dropped by 75%. Although the hardness of the coating containing nickel-aluminide increases by up to 32% compared to the coating without nickel-aluminide, nickel-aluminide does not affect the thermal stability of the coating.

关键词： nickel-aluminide aluminum matrix composite friction surfacing wear resistance

Effect of reverse dual rotation process on properties of friction stir welding of AA7075 to AISI304

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2019年第5期29卷 964-975页

作者： hamed jamshidi aval Altino LOUREIRO Department of Materials Engineering Babol Noshirvani University of TechnologyShariati AvenueBabolIran CEMUC Department of Mechanical EngineeringUniversity of CoimbraRua Luís Reis Santos3030-788 CoimbraPortugal

The friction stir lap welding of AISI304 stainless steel to AA7075 aluminium alloy was investigated using the conventional friction stir welding (C-FSW) and the reverse dual rotation friction stir welding (DR-FSW) processes. In order to reduce the heat input, a dual rotation tool with a lower shoulder rotating speed was used. The results showed that both processes provide welds with excellent appearance and free of internal defects. The use of the DR-FSW process with the tool shoulder rotating reversely at low speed results in larger grain refinement in the nugget and less change in the microstructure of the aluminium alloy than using the C-FSW. The use of DR-FSW process at low speed of rotation allows to reduce the amount of intermetallic compounds in the welding interface, but does not prevent their formation. Although DR-FSW welding exhibits tensile strength superior to that achieved with the conventional process (C-FSW), both exhibit brittle behaviour with fracture at the weld interface.

关键词： dual rotation tool dissimilar friction stir welding AA7075 AISI304 microstructure mechanical properties

Non-isothermal aging behavior of in-situ AA2024−Al_(3)NiCu composite

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2125-2137页

作者： Ramezanali FARAJOLLAHI hamed jamshidi aval Roohollah JAMAATI Department of Materials Engineering Babol Noshirvani University of TechnologyShariati AvenueBabol 47148-71167Iran

The effect of non-isothermal aging treatment on microstructure and mechanical properties of in-situ AA2024−Al_(3)NiCu composite fabricated by the stir casting process was *** Al_(3)NiCu intermetallic was created by adding 3 wt.%nickel powder during stir casting and homogenization treatment at 500℃ for 24 h after *** microstructural results obtained using optical and scanning electron microscope indicate that,after non-isothermal aging treatment,the S-Al_(2)CuMg precipitates become finer,forming a poor zone of this precipitate in the area between the ***,adding nickel during stir casting reduces the precipitation rate and the contribution of S-Al_(2)CuMg precipitates in strengthening composite during non-isothermal *** maximum hardness,ultimate tensile strength,and toughness achieved in the 3 wt.%nickel-containing sample after non-isothermal aging at 250℃ are(121.30±4.21)HV,(221.67±8.31)MPa,and(1.67±0.08)MJ/m^(3),*** maximum hardness and ultimate tensile strength of AA2024−Al_(3)NiCu composite are decreased by 6%and 4%,respectively,compared to those of nickel-free AA2024 aluminum alloy.

关键词： AA2024 aluminum matrix composite stir casting method non-isothermal aging treatment Al_(3)NiCu reinforcement

Theoretical and experimental studies on fabrication of two-layer aluminum−copper pipe by friction stir additive manufacturing

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3643-3658页

作者： Mehdi FALAHATI NAQIBI Majid ELYASI hamed jamshidi aval Mohammad Javad MIRNIA Department of Mechanical Engineering Babol Noshirvani University of TechnologyShariati AvenueBabol 47148-71167Iran Department of Materials Engineering Babol Noshirvani University of TechnologyShariati AvenueBabol 47148-71167Iran

Using a friction stir additive manufacturing(FSAM)process,the fabrication of a two-layer aluminum−copper pipe was studied experimentally and *** this purpose,by presenting a 3D thermo-mechanical model in ABAQUS software,the temperature and strain distributions during the process were *** simulation results show that,although the rotational-to-traverse speed ratio with a good approximation can predict the heat input during welding,it is not a precise measure to predict the occurrence of defects in the weld *** is a good agreement between the predicted and experimental thermal results,and the maximum relative error is 4.1%in estimating the maximum temperature during *** to heat and severe plastic deformation in the stir zone,the aluminum−copper intermetallic compounds(CuAl_(2) and Cu_(9)Al_(4))are *** maximum hardness in the stir zone is 301.4 HV_(0.1) in sample welded with an overlap of−0.5 *** ultimate tensile strength and elongation of the two-layer pipe fabricated by friction stir additive manufacturing are(319.52±2.31)MPa and 19.47%,respectively.

关键词： friction stir welding thermo-mechanical simulation two-layer Al−Cu pipes microstructure mechanical properties

1050 铝合金基板上 Al−Mg−Si−Cu_((p))复合涂层的构建

在线全文

学校读者我要写书评

暂无评论

中国有色金属学报:英文版 2023年第9期33卷 2599-2612页

作者： hamed jamshidi aval Department of Materials Engineering Babol Noshirvani University of TechnologyShariati AvenueBabol 47148-71167Iran

利用摩擦堆焊工艺在AA1050铝合金基板上制备铜颗粒增强AA6061铝合金基复合材料涂层。研究耗材棒的增强相含量和预涂层热处理条件对涂层显微组织和力学性能的影响。结果表明,使用T6处理的耗材棒和增加铜含量使摩擦堆焊过程的温度升高。... 详细信息

利用摩擦堆焊工艺在AA1050铝合金基板上制备铜颗粒增强AA6061铝合金基复合材料涂层。研究耗材棒的增强相含量和预涂层热处理条件对涂层显微组织和力学性能的影响。结果表明,使用T6处理的耗材棒和增加铜含量使摩擦堆焊过程的温度升高。随着铜粉含量的增加,使用经T6处理和固溶态耗材棒制备的涂层的平均晶粒尺寸均减小,且与T6处理相比,用固溶态耗材棒制备的涂层的平均晶粒尺寸细16%。当铜的质量分数增加至20%时,使用T6处理耗材棒和固溶态耗材棒制备的涂层的耐磨性分别比AA1050基板提高了28%和24%。此外,使用T6处理和添加20%铜(质量分数)的耗材棒制备的涂层的剪切强度、硬度和耐磨性分别比使用固溶态耗材棒制备的涂层提高了4%、8%和5%。

关键词： AA6061基复合材料摩擦堆焊显微组织预涂层热处理

同方期刊数据库

时效热处理对摩擦堆焊铝基复合材料显微组织和腐蚀行为的影响

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2023年第8期33卷 2303-2313页

作者： hamed jamshidi aval Department of Materials Engineering Babol Noshirvani University of TechnologyShariati Avenue 47148-71167BabolIran

研究人工时效热处理对Al−Zn−Mg−Cu基复合材料显微组织和腐蚀行为的影响。采用搅拌铸造工艺原位制备铝化镍增强Al−Zn−Mg−Cu合金复合材料,采用摩擦堆焊法将该铸态复合材料耗材杆堆焊在AA1050铝合金基体上,并在125℃进行人工时效热处理18 ... 详细信息

研究人工时效热处理对Al−Zn−Mg−Cu基复合材料显微组织和腐蚀行为的影响。采用搅拌铸造工艺原位制备铝化镍增强Al−Zn−Mg−Cu合金复合材料,采用摩擦堆焊法将该铸态复合材料耗材杆堆焊在AA1050铝合金基体上,并在125℃进行人工时效热处理18 h。结果发现,无镍合金中晶粒发生明显长大。此外,复合材料显微组织中铝化镍增强相的存在导致双态组织的形成。富镍颗粒的存在和析出相的强化机制使含镍材料的硬度和强度得到提高。经人工时效热处理后,含铝化镍复合材料的剪切强度和硬度比铝基体分别提高了24%和13%。含镍颗粒的存在显著提高了未热处理合金的耐点蚀性能。经时效热处理后,含镍样品的耐腐蚀性比不含镍样品降低了39%,这是因为含镍样品中的富镍颗粒吸附了更多的可溶性铜。

关键词：铝基复合材料铝化镍增强相摩擦堆焊人工时效热处理腐蚀行为