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Mg-1Zn-1Gd合金在等徑角擠壓下的晶粒細化機理及織構(gòu)演變
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1.廣東省科學院材料與加工研究所;2.廣東工業(yè)大學

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國家自然科學基金項目(面上項目,重點項目,重大項目)


Grain Refinement and Texture Evolution of Mg-1Zn-1Gd Alloy by the Equal Channel Angular Pressing
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1.Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences;2.School of Materials and Energy, Guangdong University of Technology

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    摘要:

    研究等徑角擠壓(ECAP)對Mg-1Zn-1GD合金組織、織構(gòu)和動態(tài)再結(jié)晶行為的影響,結(jié)果表明,在350℃等徑角擠壓后,試樣的顯微組織由細小的再結(jié)晶晶粒組成,基體中有大量均勻分布的等軸晶。8道次獲得平均晶粒尺寸為3.6m的均勻超細晶粒結(jié)構(gòu)。不連續(xù)動態(tài)再結(jié)晶(DDRX)和連續(xù)動態(tài)再結(jié)晶(CDRX)導致晶粒細化。利用電子背散射衍射技術(shù)對織構(gòu)進行了分析。結(jié)果表明,經(jīng)過4次ECAP后,形成了較強的基礎(chǔ)紋理(多重隨機分布~19.76)。隨著擠壓道次的增加,擠壓合金板材基面上的晶粒主要沿擠壓方向拉長,取向分布由集中狀態(tài)向分散狀態(tài)轉(zhuǎn)變??棙?gòu)減弱,最大值為15.66。最后表明織構(gòu)與Mg-1Zn-1GD合金的平面各向異性有關(guān).

    Abstract:

    In this paper, in order to find out the effect of Equal Channel Angular Pressing (ECAP) on the microstructure and texture, as well as dynamic recrystallization (DRX) behavior, Mg-1Zn-1Gd alloy (wt.%) was investigated. The results show that after the equal channel angular pressing at 350℃, the microstructures of these samples is composed of fine recrystallized grains, and there are a large number of homogeneously distributed equiaxed grains in the matrix. Upon 8 passes, the uniform ultra-fine grain structure with an average grain size of 3.6 μm is obtained. The mechanism of the discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) lead to grain refinement. The micro-texture was analyzed through electron backscatter diffraction (EBSD) technique. It is revealed that after 4 passes of ECAP, a strong basal texture is achieved (multiple?random?distribution?~19.76). With the extrusion passes increasing, the grain in the basal planes of extruded alloy billet is mainly elongated along the extrusion direction, the orientation distribution changes from concentrated state to decentralized state. The texture is weakened which the maximum strength is 15.66 mrd. Finally, the texture is also related to the plane anisotropy of the Mg-1Zn-1Gd alloy.

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奉隆彪,黎小輝,宋旭東,袁鴿成,盧鳳池. Mg-1Zn-1Gd合金在等徑角擠壓下的晶粒細化機理及織構(gòu)演變[J].稀有金屬材料與工程,2020,49(10):3325~3331.[Feng Longbiao, Li Xiaohui, Song Xudong, Yuan Gecheng, Lu Fengchi. Grain Refinement and Texture Evolution of Mg-1Zn-1Gd Alloy by the Equal Channel Angular Pressing[J]. Rare Metal Materials and Engineering,2020,49(10):3325~3331.]
DOI:10.12442/j. issn.1002-185X.20190671

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  • 收稿日期:2019-08-16
  • 最后修改日期:2019-10-06
  • 錄用日期:2019-10-11
  • 在線發(fā)布日期: 2020-11-04
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