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Mg-Y-Nd-Zn合金中LPSO的存在对孪晶形成的影响

汪 涛，孙 威*，王子荣，杨 旭，封钰明，刘林林
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2016年 第35卷 第5期: ：１０００⁃６２８１（２０１６）０５⁃０３９３⁃０６     下载地址：

Mg-Y-Nd-Zn合金中LPSO的存在对孪晶形成的影响

汪  涛，孙  威*，王子荣，杨  旭，封钰明，刘林林

(北京工业大学固体微结构与性能研究所， 北京100124)

摘  要  利用背散射电子衍射(EBSD)和透射电子显微镜(TEM)技术研究了含LPSO结构的Mg-1.1Y-0.4Nd-0.8Zn (at.%)合金中的孪晶形成特征。结果发现14H型LPSO结构的存在对压缩变形所生成孪晶类型影响不大，但会使孪晶板条尺寸减小且与板条边界交截产生台阶。受14H型LPSO结构存在的影响，(10-12)孪晶表现出两种生长形态：在LPSO片层较窄且分布稀疏区域，孪晶可直接切过并使LPSO片层发生3.7°弯折；而在LPSO片层较厚其密度较高区域，孪晶无法穿越LPSO片层，但其可通过在随后片层的另一端重新形核生长方式继续进行传播。

关键词  镁合金；长周期；孪晶；室温变形

中图分类号：TG146.2+2   文献标识码：A    doi:10.3969/j.issn.1000-6281.2016.05.003

 

 

Effect of existing LPSO structure on twin formation in Mg-Y-Nd-Zn alloy

WANG Tao，SUN Wei*，WANG Zi-rong，YANG Xu，FENG Yu-ming，LIU Lin-lin

(Institute of Microstructure and Property of Advanced Materials，Beijing University of Technology，Beijing 100124，China)

 

AbstractTwin formation in the deformed Mg-1.1Y-0.4Nd-0.8Zn (at.%) alloy has been studied by a combination of EBSD and TEM examinations.The results show that the existing 14H type LPSO structure has less influence on the twinning mode when the alloy subjected to compressive deformation, but can result in a decrease of twin size and in occurrence of intersecting steps in the twinning surfaces as well. Concerning the effect of pre-existing LPSO structure on the (10-12) twinning process, two kinds of growth featureshave been observed. When the (10-12) twin growth proceeds in a region distributed with thin and widely-spaced LPSO slabs, the twinning can cross the LPSO layers by bendingthem to a angle of 3.7°.  When encountering thick and closely-spaced LPSO slabs, the twinning can not cross them, but instead can initiate againin the Mg matrix beyond these LPSO slabs through a process including nucleation and growth. This process can occur in sequence such that deformation twinning appears to propagate forward.

Keywords  magnesium alloy; LPSO; twin; deformation at room temperature

 

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