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工業(yè)純鋁等通道球形轉(zhuǎn)角膨脹擠壓變形的力學(xué)與摩擦學(xué)性能
作者:
作者單位:

1.高端工程機(jī)械智能制造國家重點(diǎn)實(shí)驗(yàn)室;2.徐州工程學(xué)院;3.江蘇徐工工程機(jī)械研究院有限公司

作者簡介:

通訊作者:

中圖分類號:

TG376

基金項(xiàng)目:

國家自然科學(xué)基金項(xiàng)目(51905462);江蘇省自然科學(xué)基金項(xiàng)目(BK2020020963);江蘇省“六大人才高峰”高層次人才選拔培養(yǎng)資助項(xiàng)目(GDZB-127)


Mechanical and Tribological Properties of Commercially Pure Aluminum Processed by Equal Channel Angular Expansion Extrusion with Spherical Cavity
Author:
Affiliation:

1.State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery;2.School of Mechanical and Electrical Engineering,Xuzhou University of Technology,Xuzhou;3.Jiangsu XCMG Construction Machinery Research Institute Co Ltd

Fund Project:

the National Nature Science Foundation of China (51905462); the Natural Science Foundation of Jiangsu Province (BK2020020963) and the “Six Talent Peaks” sponsored project of Jiangsu province (GDZB-127)

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    摘要:

    對傳統(tǒng)等通道轉(zhuǎn)角擠壓工藝(Equal Channel Angular Extrusion, ECAE)進(jìn)行改進(jìn),提出一種新型劇烈塑性變形法(severe plastic deformation, SPD)——等通道球形轉(zhuǎn)角膨脹擠壓(Equal Channel Angular Expansion Extrusion with Spherical Cavity, ECAEE-SC)。該工藝通過耦合鐓-剪-擠等多種變形效應(yīng),可在單道次擠壓下實(shí)現(xiàn)坯料內(nèi)部較大的塑性應(yīng)變累積,進(jìn)而獲得理想的晶粒細(xì)化與性能提升效果。在室溫條件下采用ECAEE-SC工藝對工業(yè)純鋁(Al-1060)進(jìn)行單道次擠壓,并與相同條件下的2道次ECAE變形結(jié)果進(jìn)行對比。采用EBSD、SEM等測試手段,研究了工業(yè)純鋁ECAEE-SC變形晶粒特征與磨損表面形貌,并測試了變形材料顯微硬度、拉伸性能與摩擦學(xué)性能。結(jié)果表明,在ECAEE-SC工藝劇烈塑性應(yīng)變誘導(dǎo)下,工業(yè)純鋁經(jīng)單道次擠壓變形后晶粒顯著細(xì)化,呈典型的剪切條帶狀特征。與初始退火態(tài)相比,變形材料顯微硬度與抗拉強(qiáng)度分別提升了92.6%和91.8%,且性能提升效果明顯優(yōu)于2道次ECAE變形。同時(shí), ECAEE-SC工藝有效提高了工業(yè)純鋁的耐磨性能,工業(yè)純鋁變形后表面磨痕寬度最小,磨痕深度最淺,其磨損機(jī)理以磨粒磨損為主導(dǎo)。

    Abstract:

    A novel severe plastic deformation (SPD) method, entitled Equal Channel Angular Expansion Extrusion with Spherical Cavity (ECAEE-SC) was introduced based on a modification of the conventional Equal Channel Angular Extrusion (ECAE) process. By integrating expansion, shear and extrusion deformations in a single extrusion pass, ECAEE-SC process could induce larger accumulated strains into the billet, resulting in the significant grain refinement and the associated properties improvement. In the present study, commercially pure aluminum (Al-1060) was subjected to one pass of ECAEE-SC process at room temperature, and two passes of ECAE process were also conducted for comparison. The microstructure, Vickers hardness, tensile properties and wear properties of processed material were investigated. The results showed that after one pass of ECAEE-SC process, the grains of ECAEE-SC processed aluminum were greatly refined with a typically elongated microstructure due to the high level of strains induced in the material. The hardness and tensile strength of ECAEE-SC processed material were increased with a significantly growth almost 92.6% and 91.8% than the initial material, respectively. These improvements were considerately higher than that achieved by two passes of ECAE process. Moreover, the wear resistance of ECAEE-SC processed material was also enhanced. The worn surface morphology of ECAEE-SC processed sample represented the minimum width and depth of the wear scars, indicating that the wear mechanism could be dominated by abrasive wear.

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引用本文

張翔,王曉溪,耿彥波,陳波,徐國,王峰.工業(yè)純鋁等通道球形轉(zhuǎn)角膨脹擠壓變形的力學(xué)與摩擦學(xué)性能[J].稀有金屬材料與工程,2021,50(3):733~739.[Zhang Xiang, Wang Xiaoxi, Geng Yanbo, Chen Bo, Xu Guo, Wang Feng. Mechanical and Tribological Properties of Commercially Pure Aluminum Processed by Equal Channel Angular Expansion Extrusion with Spherical Cavity[J]. Rare Metal Materials and Engineering,2021,50(3):733~739.]
DOI:10.12442/j. issn.1002-185X.20200619

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  • 收稿日期:2020-08-18
  • 最后修改日期:2020-10-10
  • 錄用日期:2020-10-15
  • 在線發(fā)布日期: 2021-04-02
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