合金成分对Mg-Zn-Y合金准晶形貌和体积分数的影响
TG146.2+2; 利用铁模铸造法制备Zn/Y=6:1 (原子比) 的Mg-Zn-Y合金, 通过XRD, SEM, EDS, TEM和DSC等研究合金成分对Mg-Zn-Y合金相组成、Mg3Zn6Y准晶相 (准晶Ⅰ相) 形貌和体积分数的影响.结果表明:Mg-Zn-Y合金的相组成、准晶Ⅰ相形貌、体积分数及其生成反应与合金成分密切相关.随着合金中Zn和Y元素含量的减少, 准晶Ⅰ相的形成反应由单一的包晶反应到包-共晶反应再到完全共晶反应.当合金中Y含量≥7% (原子分数, 下同) 时, 合金由 (Mg, Zn) 5Y、准晶Ⅰ相、Mg2Zn3和Mg7Zn3相组成, 且以叠层状形式分布在合金组织中.合金...
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Published in | 材料工程 Vol. 47; no. 3; pp. 116 - 122 |
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Main Authors | , , , , |
Format | Journal Article |
Language | Chinese |
Published |
陕西省光电功能材料与器件重点实验室,西安 710021
20.03.2019
西安工业大学 材料与化工学院,西安 710021 陕西省镁铝轻合金复合材料工程研究中心,西安 710021 |
Subjects | |
Online Access | Get full text |
ISSN | 1001-4381 |
DOI | 10.11868/j.issn.1001-4381.2018.000587 |
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Abstract | TG146.2+2; 利用铁模铸造法制备Zn/Y=6:1 (原子比) 的Mg-Zn-Y合金, 通过XRD, SEM, EDS, TEM和DSC等研究合金成分对Mg-Zn-Y合金相组成、Mg3Zn6Y准晶相 (准晶Ⅰ相) 形貌和体积分数的影响.结果表明:Mg-Zn-Y合金的相组成、准晶Ⅰ相形貌、体积分数及其生成反应与合金成分密切相关.随着合金中Zn和Y元素含量的减少, 准晶Ⅰ相的形成反应由单一的包晶反应到包-共晶反应再到完全共晶反应.当合金中Y含量≥7% (原子分数, 下同) 时, 合金由 (Mg, Zn) 5Y、准晶Ⅰ相、Mg2Zn3和Mg7Zn3相组成, 且以叠层状形式分布在合金组织中.合金在凝固过程中通过包晶反应形成多边形块状准晶Ⅰ相;当Y含量<7%时, 合金中除 (Mg, Zn) 5Y、准晶Ⅰ相和Mg7Zn3相外, 还析出了Mg相.当合金中Y含量在5%~7%时, 准晶Ⅰ相通过包晶和共晶反应生成, 以共晶反应为主.当Y含量≤4%时, 准晶Ⅰ相完全通过共晶反应形成 (Mg+I-phase) 层片状共晶组织.所研究的合金中均生成了体积分数大于27%的准晶Ⅰ相, Mg30Zn60Y10合金中准晶Ⅰ相的体积分数最高, 约为77%. |
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AbstractList | TG146.2+2; 利用铁模铸造法制备Zn/Y=6:1 (原子比) 的Mg-Zn-Y合金, 通过XRD, SEM, EDS, TEM和DSC等研究合金成分对Mg-Zn-Y合金相组成、Mg3Zn6Y准晶相 (准晶Ⅰ相) 形貌和体积分数的影响.结果表明:Mg-Zn-Y合金的相组成、准晶Ⅰ相形貌、体积分数及其生成反应与合金成分密切相关.随着合金中Zn和Y元素含量的减少, 准晶Ⅰ相的形成反应由单一的包晶反应到包-共晶反应再到完全共晶反应.当合金中Y含量≥7% (原子分数, 下同) 时, 合金由 (Mg, Zn) 5Y、准晶Ⅰ相、Mg2Zn3和Mg7Zn3相组成, 且以叠层状形式分布在合金组织中.合金在凝固过程中通过包晶反应形成多边形块状准晶Ⅰ相;当Y含量<7%时, 合金中除 (Mg, Zn) 5Y、准晶Ⅰ相和Mg7Zn3相外, 还析出了Mg相.当合金中Y含量在5%~7%时, 准晶Ⅰ相通过包晶和共晶反应生成, 以共晶反应为主.当Y含量≤4%时, 准晶Ⅰ相完全通过共晶反应形成 (Mg+I-phase) 层片状共晶组织.所研究的合金中均生成了体积分数大于27%的准晶Ⅰ相, Mg30Zn60Y10合金中准晶Ⅰ相的体积分数最高, 约为77%. |
Abstract_FL | Mg-Zn-Y alloys with a Zn/Y=6:1 (atomic ratio) were prepared by steel mould casting method. The effect of alloy composition on phase constituents as well as the morphology, volume fraction of Mg3Zn6Y quasi-crystalline phase (quasi-crystalline Ⅰ-phase) in Mg-Zn-Y alloys was investigated by XRD, SEM, EDS, TEM and DSC. Results show that the phase constituents, the morphology, volume fraction and formation mechanism of Mg3Zn6Y quasi-crystalline Ⅰ-phase in the Mg-Zn-Y alloys are closely related to alloys' compositions. The formation reaction of quasi-crystalline Ⅰ-phase is transferred from fully peritectic reaction to the combination of peritectic and eutectic reactions, and to completely eutectic reaction with the decrease of Zn and Y content in the alloys. When the Y content is and more than 7% (atom fraction) , the alloys are composed of (Mg, Zn) 5Y, quasi-crystalline Ⅰ-phase, Mg2Zn3and Mg7Zn3phases and they are distributed in a layered form in the alloy, and the quasi-crystalline Ⅰ-phase takes the polygonal form by peritectic reaction during solidification. When the Y content is less than 7%, Mg phase precipitates in the alloys and their microstructure consists of (Mg, Zn) 5Y, quasi-crystalline Ⅰ-phase, Mg7Zn3and Mg phases. When the Y content is between 5% and 7%, the quasi-crystalline Ⅰ-phase is precipitated by peritectic and eutectic reaction, and eutectic reaction, which dominates the precipitation of quasi-crystalline Ⅰ-phase. When the Y content is and less than 4%, the quasi-crystalline Ⅰ-phase forms totally a (Mg+Ⅰ-phase) lamellar eutectic microstructure by eutectic reaction. The volume fraction of quasi-crystalline Ⅰ-phase is all greater than 27%, and in Mg30Zn60Y10 alloy is the maximum (about 77%) among the studied alloys. |
Author | 李建平 袁姣娜 杨忠 王建利 郭永春 |
AuthorAffiliation | 西安工业大学 材料与化工学院,西安 710021;陕西省镁铝轻合金复合材料工程研究中心,西安 710021;陕西省光电功能材料与器件重点实验室,西安 710021 |
AuthorAffiliation_xml | – name: 西安工业大学 材料与化工学院,西安 710021;陕西省镁铝轻合金复合材料工程研究中心,西安 710021;陕西省光电功能材料与器件重点实验室,西安 710021 |
Author_FL | WANG Jian-li YANG Zhong LI Jian-ping YUAN Jiao-na GUO Yong-chun |
Author_FL_xml | – sequence: 1 fullname: YUAN Jiao-na – sequence: 2 fullname: WANG Jian-li – sequence: 3 fullname: YANG Zhong – sequence: 4 fullname: GUO Yong-chun – sequence: 5 fullname: LI Jian-ping |
Author_xml | – sequence: 1 fullname: 袁姣娜 – sequence: 2 fullname: 王建利 – sequence: 3 fullname: 杨忠 – sequence: 4 fullname: 郭永春 – sequence: 5 fullname: 李建平 |
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ClassificationCodes | TG146.2+2 |
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DocumentTitle_FL | Effect of alloy composition on morphology and volume fraction of quasi-crystalline of Mg-Zn-Y alloy |
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Keywords | quasi-crystalline Ⅰ-phase formation mech-anism of quasi-crystalline Ⅰ-phase volume fraction morphology Mg-Zn-Y合金 体积分数 形貌 准晶Ⅰ相 准晶Ⅰ相形成机理 Mg-Zn-Y alloy |
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Snippet | TG146.2+2; 利用铁模铸造法制备Zn/Y=6:1 (原子比) 的Mg-Zn-Y合金, 通过XRD, SEM, EDS, TEM和DSC等研究合金成分对Mg-Zn-Y合金相组成、Mg3Zn6Y准晶相 (准晶Ⅰ相) 形貌和体积分... |
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Title | 合金成分对Mg-Zn-Y合金准晶形貌和体积分数的影响 |
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