亚共晶Zn-4.45%Al合金凝固组织的晶体学特征<sup>*</sup>

doi:10.11901/1005.3093.2013.359

材料研究学报

2014, Vol. 28

Issue (2): 126-132 DOI: 10.11901/1005.3093.2013.359

本期目录 | 过刊浏览

亚共晶Zn-4.45%Al合金凝固组织的晶体学特征^*

李磊(

),秦克,张海涛,赵志浩,朱庆丰,左玉波,崔建忠

东北大学材料电磁过程研究教育部重点实验室沈阳 110004

Crystallographic Features of a Solidified Hypoeutectic Zn-4.45%Al Alloy

Lei LI(

),Ke QIN,Haitao ZHANG,Zhihao ZHAO,Qingfeng ZHU,Yubo ZUO,Jianzhong CUI

Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819

引用本文:

李磊,秦克,张海涛,赵志浩,朱庆丰,左玉波,崔建忠. 亚共晶Zn-4.45%Al合金凝固组织的晶体学特征^*[J]. 材料研究学报, 2014, 28(2): 126-132.
Lei LI, Ke QIN, Haitao ZHANG, Zhihao ZHAO, Qingfeng ZHU, Yubo ZUO, Jianzhong CUI. Crystallographic Features of a Solidified Hypoeutectic Zn-4.45%Al Alloy[J]. Chinese Journal of Materials Research, 2014, 28(2): 126-132.

全文: PDF(6470 KB) HTML

摘要:

将亚共晶Zn-Al合金凝固, 借助EBSD技术研究了其组织的晶体学特征。结果表明, 在样品上部形成了由多个伸长共晶团构成的羽毛状组织, 且此共晶团中β和α相存在取向关系。其次, 初生β相沉积在样品下部, 且其呈扁平枝晶状: 六个一次枝晶臂沿 < 10 1 ? 0 > 方向快速生长而沿<0001>方向则生长缓慢。此外, 初生β相内部存在α相析出物, 且初生β与此α也存在上述取向关系, 但初生β与周围的伪初生α及其附近的共晶β与α之间没有特定取向关系。

关键词 ：材料科学基础学科, 凝固, 微观组织, 晶体学, 电子背散射衍射

Abstract：

A hypoeutectic Zn-4.45 mass%Al alloy was molten and then slowly solidified in an electrical furnace. The microstructure and the relevant crystallographic feature on longitudinal section of the solidified alloy ingot were characterized by means of SEM with EBSD technique. The results show that feather-like structure consisted of some elongated eutectic colonies is developed in the upper part of the specimen and a specific crystallographic orientation relationship (OR) () exists between β and αin the eutectic colonies. Moreover, the primary β dendrites are segregated in the lower part of the specimen with a flat morphology: six primary arms grow quickly along but slowly along <0001>. In addition, some αprecipitates are present in the interior of primary β dendrites, and there exists certain OR between β and α as that mentioned above. However, no specific OR is found between the primary β dendrites and their attached pseudo-primary αphase as well as between the adjacent eutectic β and α.

Key words： foundational discipline in materials science solidification microstructure crystallography EBSD

收稿日期: 2013-05-28

基金资助:* 国家自然科学基金51201029 和中国博士后科研基金资助项目2012M520637。

作者简介: 本文联系人: 李磊

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图1 合金样品纵截面宏观组织

图2 样品上部羽毛状组织微观图和对应层片状共晶β及α相的极图

图3 样品下部微观图

图4 枝晶状和柱状初生β相SEM图, 在六方结构图上表示出的初生β相晶体学生长方向及初生β相内部析出的富铝α相

图5 初生β相及其附近的共晶β和α组织SEM图及“脚”状形貌的初生β相与其附近的脚趾状共晶组织SEM图

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