Effect of Y content on hot tearing susceptibility of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys
Based on the Clyne-Davies model,the hot tearing susceptibility(CSC)of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub>(<i>x</i>=1,2,4,6,mass fraction/%) was predicted.The microstructure and morphology of hot tearing regions of the alloy...
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doaj-4ecea590b1f94e4ea60fcb0cfa95e3382020-11-24T21:28:36ZzhoJournal of Materials EngineeringJournal of Materials Engineering1001-43811001-43812019-07-0147712613310.11868/j.issn.1001-4381.2017.001406201907001406Effect of Y content on hot tearing susceptibility of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloysJIA Dong-rui0WANG Yue1LIU Zheng2MAO Ping-li3WANG Feng4WANG Zhi5School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaBased on the Clyne-Davies model,the hot tearing susceptibility(CSC)of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub>(<i>x</i>=1,2,4,6,mass fraction/%) was predicted.The microstructure and morphology of hot tearing regions of the alloys were observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and the curves of solidification shrinkage stress with temperature (or time) of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys based on the "T" type hot tearing permanent-mold were collected.The results demonstrate that the predicted values of CSC are consistent with that of measured values of crack volume.The hot tearing susceptibility of the alloys from high to low is:MgZn<sub>9</sub>Y<sub>1</sub>Zr<sub>0.5</sub> > MgZn<sub>9</sub>Y<sub>6</sub>Zr<sub>0.5</sub> > MgZn<sub>9</sub>Y<sub>2</sub>Zr<sub>0.5</sub> > MgZn<sub>9</sub>Y<sub>4</sub>Zr<sub>0.5</sub>;the dendrite coherency temperature and the initial temperature of hot tearing decrease with the Y content increasing when <i>w</i>(Y) is not more than 4%.When <i>w</i>(Y) is 6%, the dendrite coherency temperature and the initial temperature of hot tearing increase.With the increase of Y content, the change of precipitation phase type, content and the dendrite tendency of α-Mg in the solidification process of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys is considered as the main micro-mechanism that affects crack initiation,propagation and hot tearing in grain boundary.http://jme.biam.ac.cn/CN/Y2019/V47/I7/126MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub>hot tearing susceptibilitysolidification shrinkage stressmicro-mechanism |
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language |
zho |
format |
Article |
sources |
DOAJ |
author |
JIA Dong-rui WANG Yue LIU Zheng MAO Ping-li WANG Feng WANG Zhi |
spellingShingle |
JIA Dong-rui WANG Yue LIU Zheng MAO Ping-li WANG Feng WANG Zhi Effect of Y content on hot tearing susceptibility of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys Journal of Materials Engineering MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> hot tearing susceptibility solidification shrinkage stress micro-mechanism |
author_facet |
JIA Dong-rui WANG Yue LIU Zheng MAO Ping-li WANG Feng WANG Zhi |
author_sort |
JIA Dong-rui |
title |
Effect of Y content on hot tearing susceptibility of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys |
title_short |
Effect of Y content on hot tearing susceptibility of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys |
title_full |
Effect of Y content on hot tearing susceptibility of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys |
title_fullStr |
Effect of Y content on hot tearing susceptibility of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys |
title_full_unstemmed |
Effect of Y content on hot tearing susceptibility of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys |
title_sort |
effect of y content on hot tearing susceptibility of mgzn<sub>9</sub>y<sub><i>x</i></sub>zr<sub>0.5</sub> alloys |
publisher |
Journal of Materials Engineering |
series |
Journal of Materials Engineering |
issn |
1001-4381 1001-4381 |
publishDate |
2019-07-01 |
description |
Based on the Clyne-Davies model,the hot tearing susceptibility(CSC)of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub>(<i>x</i>=1,2,4,6,mass fraction/%) was predicted.The microstructure and morphology of hot tearing regions of the alloys were observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and the curves of solidification shrinkage stress with temperature (or time) of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys based on the "T" type hot tearing permanent-mold were collected.The results demonstrate that the predicted values of CSC are consistent with that of measured values of crack volume.The hot tearing susceptibility of the alloys from high to low is:MgZn<sub>9</sub>Y<sub>1</sub>Zr<sub>0.5</sub> > MgZn<sub>9</sub>Y<sub>6</sub>Zr<sub>0.5</sub> > MgZn<sub>9</sub>Y<sub>2</sub>Zr<sub>0.5</sub> > MgZn<sub>9</sub>Y<sub>4</sub>Zr<sub>0.5</sub>;the dendrite coherency temperature and the initial temperature of hot tearing decrease with the Y content increasing when <i>w</i>(Y) is not more than 4%.When <i>w</i>(Y) is 6%, the dendrite coherency temperature and the initial temperature of hot tearing increase.With the increase of Y content, the change of precipitation phase type, content and the dendrite tendency of α-Mg in the solidification process of MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> alloys is considered as the main micro-mechanism that affects crack initiation,propagation and hot tearing in grain boundary. |
topic |
MgZn<sub>9</sub>Y<sub><i>x</i></sub>Zr<sub>0.5</sub> hot tearing susceptibility solidification shrinkage stress micro-mechanism |
url |
http://jme.biam.ac.cn/CN/Y2019/V47/I7/126 |
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