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| 1 | 搅拌摩擦加工制备颗粒增强铝基复合材料的研究现状及展望显示文摘铝合金作为现代工程和高新技术领域发展的关键材料之一,具有密度小、比强度和比刚度高、耐蚀性好等特点。通过在铝基体中添加增强相颗粒,制备得到的颗粒增强铝基复合材料既有铝合金良好的强度、韧性、易成形性等特点,又有颗粒的高强、高模等优点,是近年来应用最广的一类金属基复合材料。目前,制备铝基复合材料的方法主要有粉末冶金法、铸造以及超声波法等,但这些方法在制备过程中需要较高的温度,颗粒与金属基体容易发生不良的界面反应,从而影响界面结合效果,降低复合材料的性能。搅拌摩擦加工(FSP)作为一种新型的固相加工技术,可同时实现材料微观组织的细化、致密化和均匀化。目前,FSP直接法已在铝基复合材料制备方面取得应用,主要是将增强相颗粒通过打盲孔或开槽的方式预置在金属基体内再进行FSP,进而制备出高致密度的颗粒增强铝基复合材料。因为FSP过程的温度低,颗粒与铝基体不会发生界面反应,所以该方法也被用于制备具有形状记忆效应(SME)的铝基功能复合材料。近年研究结果表明,颗粒相对FSP制备的铝基复合材料晶粒细化起到显著作用,这有助于提高复合材料的拉伸强度、显微硬度及疲劳强度等力学性能。随着颗粒含量的增加和颗粒尺寸的减小,复合材料的力学性能得以增强。再者,减小颗粒尺寸有利于改善颗粒与基体之间的结合。另外,通过优化搅拌头的结构、形状和尺寸,以及FSP工艺参数,已经可以实现加工后颗粒相在基体中的均匀分布。鉴于搅拌摩擦加工(FSP)直接法在制备颗粒增强铝基复合材料方面所具备的短流程、高效能以及基体与增强相颗粒界面无杂质等优势,本文对目前FSP直接法制备颗粒增强铝基复合材料的最新研究现状进行了总结。主要综述了FSP制备颗粒增强铝基复合材料过程中颗粒的含量、类型及尺寸对复合材料组织与力学性能的影响,并对颗粒分布均匀性以及颗粒与铝基体的界面问题做了阐述。文章最后深入分析了当前研究中的不足之处并展望了未来的研究方向。 | 席小鹏 王快社 王文 彭湃 乔柯 余良良 | 2018 | 材料导报2018，32，21： | 11 |
| 2 | 基于摩擦加工技术的镁合金表面改性研究现状显示文摘鉴于当前高性能镁合金的应用需求,亟待提高镁合金的表面硬度、摩擦磨损性以及耐蚀性等表面性能。新型固态加工技术——搅拌摩擦加工以及摩擦堆焊能够实现材料的大塑性变形,在镁合金表面微观组织结构改性、表面复合材料化以及金属焊敷层制备等方面得到了成功的应用。在介绍搅拌摩擦加工以及摩擦堆焊技术特性的基础上,分别从工艺手段、组织演变以及性能改善等方面综述了摩擦加工技术用于镁合金表面改性的研究现状。国内外研究结果显示,搅拌摩擦加工可有效细化镁合金表面晶粒,破碎粗大第二相,导入增强粒子,实现表面复合化,进而显著提高镁合金的硬度、耐磨性以及耐蚀性。摩擦堆焊技术可在镁合金表面成功制备无稀释、结合完整性高、均匀细化的金属焊敷层,有效改善镁合金表面硬度及耐磨性。通过对用于镁合金表面改性的摩擦加工技术研究现状的总结,展望了镁合金搅拌摩擦加工以及摩擦堆焊的发展前景,提出了需要进一步研究的方向。 | 陈娟 彭立明 韩靖宇 吴玉娟 郑飞燕 廖海光 | 2017 | 表面技术2017，46，3： | 5 |
| 3 | An investigation on the hardness and corrosion behavior of MWCNT/Mg composites and grain refined Mg显示文摘In the present work,multi walled carbon nanotubes(MWCNT)reinforced magnesium(Mg)matrix composite was fabricated by friction stir processing(FSP)with an aim to explore its mechanical and electrochemical behavior.Microstructural observations showed that the thickness of the produced composite layer was in the range of 2500μm.FSP resulted uniform distribution of CNT near the surface while agglomerated layers in the subsurface.Grain refinement of Mg achieved by FSP improved the hardness but significant enhancement in the hardness value was observed for FSPed MWCNT/Mg composites.Potentiodynamic polarization studies revealed that the increase in corrosion current density was observed for MWCNT/Mg composite compared with grain refined Mg and pure Mg,implying the significance of secondary phase(MWCNT)in decreasing the corrosion resistance of the composite. | N.Saikrishna G.Pradeep Kumar Reddy Balakrishnan Munirathinam Ravikumar Dumpala M.Jagannatham B.Ratna Sunil | 2018 | Journal of Magnesium and Alloys2018，6，1： | 4 |
| 4 | Influence of processing route on microstructure and wear resistance of fly ash reinforced AZ31 magnesium matrix composites显示文摘Utilizing fly ash(FA)as reinforcement for magnesium matrix composites(MMCs)brings down the production cost and the land pollution.Magnesium alloy AZ31 was reinforced with FA particles(10 vol.%)successfully by two different processing methods namely conventional stir casting and friction stir processing(FSP).The microstructural features were observed using optical microscope,scanning electron microscope and electron backscatter diffraction.The sliding wear behavior was tested using a pin-on-disc wear apparatus.The stir cast composite showed inhomogeneous particle dispersion and coarse grain structure.Some of the FA particles decomposed and reacted with the matrix alloy to produce undesirable compounds.Conversely,FSP composite showed superior particle dispersion and fine,equiaxed grains by dynamic recrystallization.FA particles encountered disintegration but there was no interfacial reaction.FSP composite demonstrated higher strengthening and wear resistance to that of stir cast composite.The morphology of the worn surface and the wear debris were studied in detail. | I.Dinaharan S.C.Vettivel M.Balakrishnan E.T.Akinlabi | 2019 | Journal of Magnesium and Alloys2019，7，1： | 2 |
| 5 | Joining of AZ91 Mg alloy and Al6063 alloy sheets by friction stir welding显示文摘In the present work,the effect of process parameters on joining of AZ91 Mg alloy and Al6063 aluminum alloy sheets during friction stir welding(FSP)was studied.A successful joint was achieved at 1100 r.p.m.tool rotational speed and 25 mm/min tool travel speed.Combination of tool rotational speed and tool travel speed has observed a profound effect on the material flow mechanisms at the nugget zone.From the microstructural studies,the joint formation was observed as mainly due to mechanical mixing of the materials.The level of metallurgical continuity at the nugget zone was observed as poor and a sharp interface at the joint was noticed.The microhardness measurements across the weld joint also revealed the lack of establishment of a perfect metallurgical bonding.X-ray diffraction analysis of weld zone showed presence of both magnesium and aluminum.Hence from the preliminary observations,it can be understood that the joining of AZ91 Mg alloy and Al6063 alloy can be achieved by FSP;however,complex issues in material mixing still need further investigations. | B.Lakshmana Prasad G.Neelaiah M.Gopi Krishna S.V.V.Ramana K.Sai Prakash G.Sarika G.Pradeep Kumar Reddy Ravikumar Dumpala B.Ratna Sunil | 2018 | Journal of Magnesium and Alloys2018，6，1： | 2 |
| 6 | Developing Mg–Zn surface alloy by friction surface allosying: In vitro degradation studies in simulated body fluids显示文摘A new variant of friction-assisted process named friction surface alloying(FSA)for developing surface alloys was demonstrated in the present work.In FSA,the dispersed phase is melted and allowed to react with the matrix material to form an alloy at the surface of a metallic substrate.In the present work,magnesium(Mg)sheets and zinc(Zn)powder were selected,and fine grained(~3.5μm)Mg–Zn surface alloy with improved hardness was produced by FSA.X-ray diffraction studies confirmed the formation of intermetallic phases of Mg and Zn at the surface.From the in vitro degradation studies carried out by immersing in simulated body fluids,a lower corrosion rate was observed for the Mg–Zn surface alloy compared with pure Mg.The surface morphologies after immersion studies indicated large degraded areas on the base Mg compared with Mg–Zn.The results demonstrate the potential of FSA in developing Mg-based surface alloys without melting the substrate to impart better surface properties. | Venkateswarlu Badisha Shabana Shaik Ravikumar Dumpala B.Ratna Sunil | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，7： | 0 |
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