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Cu、Zn對(duì)Mg晶粒尺寸以及微觀(guān)組織影響
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作者單位:

1.重慶大學(xué)材料科學(xué)與工程學(xué)院;2.東莞宜安科技股份有限公司

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基金項(xiàng)目:

國(guó)家重點(diǎn)研發(fā)項(xiàng)目(No. 2016YFB0301100)；東莞市核心技術(shù)攻關(guān)重點(diǎn)項(xiàng)目(No. 2019622134013)；重慶市重點(diǎn)研發(fā)項(xiàng)目(No. cxtc2019jscx-fxydX0044)


Effects of Cu and/or Zn addition on the grain size and microstructure of Mg
Author:
Affiliation:

1.College of Material Science and Engineering, Chongqing University;2.Dongguan EONTEC Co.,Ltd

Fund Project:

The key project of the National Key Research ＆ Development Program of China (No.2016YFB0301100); The key project of key technology research in Dongguan (No.2019622134013); The key research and development projects in Chongqing (No. cxtc2019jscx-fxydX0044).

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    摘要:

    通過(guò)向鎂熔體中單獨(dú)和復(fù)合添加一定量的Cu及Zn元素，探究了Cu、Zn對(duì)鎂晶粒尺寸和微觀(guān)組織的影響并闡釋了其細(xì)化機(jī)理；同時(shí)深入表征了Cu、Zn單獨(dú)及復(fù)合添加后合金的物相組成。結(jié)果表明：向純Mg中加入Cu、Zn和Cu、Zn復(fù)合添加后，晶粒依次由柱狀晶轉(zhuǎn)變?yōu)榈容S晶。單獨(dú)加Cu、單獨(dú)加Zn和Cu、Zn復(fù)合添加后，平均晶粒尺寸由純Mg的1270μm分別減小至470、120和85μm。單獨(dú)加Zn對(duì)Mg的晶粒細(xì)化機(jī)理主要為Zn元素的溶質(zhì)效應(yīng)；單獨(dú)加Cu對(duì)Mg的晶粒細(xì)化機(jī)理主要為Cu元素的溶質(zhì)效應(yīng)和CuMg2相對(duì)晶界的釘扎作用；Cu、Zn復(fù)合添加后細(xì)化效果更好主要是因?yàn)镃u、Zn元素的復(fù)合溶質(zhì)效應(yīng)及第二相對(duì)晶界的釘扎作用更為強(qiáng)烈。此外，單獨(dú)加Zn后，第二相呈顆粒狀分布于基體中，合金中的物相組成為α-Mg+MgZn；單獨(dú)加Cu后，第二相形貌呈網(wǎng)狀，合金中的物相組成為α-Mg+CuMg2；Cu、Zn復(fù)合添加后，Mg-5Cu-3Zn晶界上的第二相呈現(xiàn)出兩種不同的形貌，經(jīng)鑒定，連續(xù)的塊狀第二相為CuMg2相，不連續(xù)的魚(yú)骨狀第二相為CuMgZn相。

    Abstract:

    The different Mg alloys before and after Cu and/or Zn addition were used as the experimental material. The effects of Cu and/or Zn addition on the microstructures and grain sizes of Mg alloys were firstly discussed and the mechanism of grain refinement after Cu and/or Zn addition was explained. What’more, the phase compositions of different Mg alloys before and after Cu and/or Zn addition were revealed. The results show that after Zn, Cu and Cu+Zn addition in the pure Mg, the grain sizes of the alloys decreased from 1270μm (pure Mg) to 470μm, 120μm and 85μm, respectively and the crystal morphology changed from columnar grain to equiaxed grain. The Cu and Zn addition had the best grain refinement effect on pure Mg, then the Cu addition followed and the Zn addition was the worst. After Zn addition, Mg-3Zn alloy was composed of α-Mg and MgZn phases. The secondary phases were mainly in the morphology of tiny particles. After Cu addition, Mg-5Cu alloy was composed of α-Mg and CuMg2 phases. The secondary phases were mainly in the morphology of discontinuous herringbone structure. After Cu and Zn addition, Mg-5Cu-3Zn alloy was composed of α-Mg, CuMg2 and CuMgZn phases. It was found that CuMg2 phases were in the shape of continuous bulk and the CuMgZn phases were in the in the morphology of discontinuous herringbone structure. The grain refinement of Zn addition on pure Mg was mainly due to the effect of solute Zn element. And the mechanism of the grain refinement of Cu addition was the effect of solute Cu element and pinning effect of CuMg2 phases on the grain boundaries of α-Mg. However, after Cu and Zn addition, the grain size was finer than Mg-3Zn and Mg-5Cu alloys. This was mainly due to composite solute effect of Cu and Zn element and stronger pinning effect of the secondary phases.

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袁光宇,游國(guó)強(qiáng),宰樂(lè),童鑫,李衛(wèi)榮,龍思遠(yuǎn). Cu、Zn對(duì)Mg晶粒尺寸以及微觀(guān)組織影響[J].稀有金屬材料與工程,2021,50(1):201~211.[Yuan Guangyu, You Guoqiang, Zai Le, Tong Xin, Li Weirong, Long Siyuan. Effects of Cu and/or Zn addition on the grain size and microstructure of Mg[J]. Rare Metal Materials and Engineering,2021,50(1):201~211.]
DOI：10.12442/j. issn.1002-185X.20200053

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  • 收稿日期:2020-01-20
  • 最后修改日期:2020-07-03
  • 錄用日期:2020-07-20
  • 在線(xiàn)發(fā)布日期: 2021-02-05
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