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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

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

作者： Amirhossein Ja.a.I hamed jamshidi a.a. Mohammad Ra.a.I Roohollah Ja.a.TI 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

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

作者： hamed jamshidi a.a. 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

AA1050表面Al-Mg-Cu_((p))复合涂层的力学和摩擦学性能

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Transactions of Nonferrous Metals Society of China 2023年第4期33卷 1054-1065页

作者： hamed jamshidi a.a. Department of Materials Engineering Babol Noshirvani University of TechnologyShariati AvenueBabol47148-71167Iran

研究添加铜粉和改变耗材转速对AA1050铝合金基体上摩擦堆焊Al-Mg涂层力学和摩擦学性能的影响。铜粉是通过在耗材的横截面上钻孔的方式嵌入的。用光学显微镜和电子显微镜研究涂层的显微组织,用剪切实验研究涂层的力学性能。结果表明,当... 详细信息

研究添加铜粉和改变耗材转速对AA1050铝合金基体上摩擦堆焊Al-Mg涂层力学和摩擦学性能的影响。铜粉是通过在耗材的横截面上钻孔的方式嵌入的。用光学显微镜和电子显微镜研究涂层的显微组织,用剪切实验研究涂层的力学性能。结果表明,当耗材转速从600 r/min增加到1000 r/min时,铜粉分布更加均匀,铜粉团聚现象减少,涂层的平均晶粒尺寸从(2.0±0.1)μm减小到(0.9±0.2)μm。随着转速的增加,富铜颗粒变小,并形成CuAl_(2)金属间化合物。当耗材转速从600 r/min增加到1000 r/min,使涂层从基体剥离所需的最大力从16.2 kN增加到18.4kN。转速为600、800和1000 r/min制备的涂层其磨损率分别比AA1050基材的低12%、18%和21%。

关键词：摩擦面 Al-Mg基复合材料铜增强体力学性能 AA1050基体

1050 铝合金基板上 Al−Mg−Si−Cu_((p))复合涂层的构建

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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 a.a. 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

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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

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

作者： hamed jamshidi a.a. 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

Effect of non-isothermal aging on microstructure and corrosion behaviors of multilayered friction surfaced Al-Mg-Si alloy with Ag additive

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Transactions of Nonferrous Metals Society of China 2022年

作者： hamed jamshidi a.a. Department of Materials Engineering， Babol Noshirvani University of Technology， Shariati Avenue

In this study， the influence of non-isothermal aging on the microstructure and corrosion behavior of multilayer friction surfaced Al-Mg-Si alloy with different amounts of silver additive was investigated. The silver in 4， 8， and 13 weight percentages is inserted into the consumable rods by drilling holes in the cross section of the consumable rods. The coating microstructure was studied using light and electron microscopy， the mechanical properties of coatings were studied using microhardness and tensile tests， and the corrosion resistance of samples was studied using electrochemical testing. The results show that the grain size of friction surfaced layers decreases from 1.5 ± 0.3 to 1.0 ± 0. 3 μm with increasing the percentage of silver additive from 4 to 13 wt.%. The solute silver in the aluminum matrix increases the precipitation kinetics in the Al-Mg-Si alloy. After non-isothermal aging， the yield and tensile strength in the silver containing coating are 50.6 and 43.5% higher than the silver-free coating， respectively. Non-isothermal aging treatment reduces corrosion current density and increases corrosion resistance in both samples with and without silver additive. The corrosion resistance of the silver-containing coating is 96.5% higher after non-isothermal aging than the silver-free coating.

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Effect of welding heat input and post-weld aging time on microstructure and mechanical properties in dissimilar friction stir welded AA7075-AA5086

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Transactions of Nonferrous Metals Society of China 2017年第8期27卷 1707-1715页

作者： jamshidi a.a. hamed Mechanical Engineering Babol University of Technology Shariati Avenue Babol 484 Iran

The effects of welding heat input and post-weld heat treatment on the mechanical and microstructural aspects of dissimilarfriction stir welds of age-hardened AA7075-T6and strain hardenable AA5086-H32aluminium alloys were investigated.X-raydiffraction(XRD)residual stress a.a.ysis and tensile testing together with optical metallography and transmission electronmicroscopy(TEM)were performed to assess the effects of process pa.a.eters on welded *** was discovered that jointsproduced without heat sink exhibited more homogeneous stir zones than other *** the natural aging time studied,higheramount of solid solution during rapid cooling of welds produced higher driving force for increase in hardness in the AA7075sideduring natural *** aging within stirring zone and thermo-mechanical affected zone of AA7075side resulted in a10to25MPa reduction in the residual stress in these zones;its effect decreased considerably in the welds performed without heat ***,natural aging had no noticeable effect on the joint strength.

关键词： friction stir welding dissimilar aluminium alloys heat treatment heat input

Effects of aging heat treatment after friction surfacing on microstructure and corrosion behavior of aluminum matrix composite

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Transactions of Nonferrous Metals Society of China 2022年

作者： hamed jamshidi a.a. Department of Materials Engineering， Babol Noshirvani University of Technology， Shariati Avenue

This research has studied the effect of artificial aging heat treatment on the microstructure and corrosion behavior of Al-Zn-Mg-Cu alloy matrix composite. In the present study， nickel-aluminide reinforcement was fabricated in-situ during the stir casting process of Al-Zn-Mg-Cu alloy. After friction surfacing of an as-cast composite consumable rod on AA1050 substrate and post-processing artificial aging heat treatment at 125 ℃ for 18 hours， significant grain growth was observed in the nickel-free sample. Moreover， the presence of nickel-aluminide reinforcement in the microstructure of composite resulted in the formation of bimodal microstructure. The presence of nickel-rich particles and the strengthening mechanism through precipitates could help increase the hardness and strength in the nickel-containing sample. After artificial aging heat treatment， the shear strength and hardness of composite containing nickel-aluminide increased 24 and 13%， respectively， more than those in the aluminum matrix. Before aging heat treatment， the pitting corrosion resistance was significantly improved by the presence of nickel-containing particles. After aging heat treatment due to the adsorption of more significant amounts of soluble copper by nickel-rich particles in the nickel-containing sample， corrosion resistance decreased 39% compared to the nickel-free sample.

关键词：

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

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

作者： Mobina YOUSEFI hamed jamshidi a.a. 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