Effect of Ce Addition on the Ignition-Proof Properties and Surface Tension of AZ91D-2.5Ca(Wt.%) Magnesium Alloy

2014 ◽  
Vol 788 ◽  
pp. 82-87 ◽  
Author(s):  
Lin Qin ◽  
Jian Ding ◽  
Zheng Fang ◽  
Wei Min Zhao
Keyword(s):  
Surface Tension ◽  
Magnesium Alloy ◽  
Oxide Film ◽  
Magnesium Alloys ◽  
Ignition Temperature ◽  
Active Element ◽  
Alloying Element ◽  
Surface Oxide Film ◽  
Ignition Point ◽  
Ce Content

In order to develop ignition-proof magnesium alloys, the effect of alloying element Ce on the ignition-proof properties and surface tension of AZ91D-2.5Ca alloy were investigated. The results show that the addition of Ce can significantly raise the ignition temperature and change the structure of surface oxide film as well as the surface tension. When the Ce content increases to 1.2%, the ignition point reaches 1371K. Upon the addition of Ce, the oxide film of AZ91D-2.5Ca melt changes to fine and close structure from the porous structure before the Ce addition. The composite oxide film mainly composed of MgO, Al2O3, CaO and Ce2O3. The surface tension of AZ91D-2.5Ca decrease with the increasing Ce content, as the active-element Ce enriched at the melt surface.

Effect of Nd and Dy Addition on AZ91D Ignition Temperature and Microhardness

2014 ◽  
Vol 788 ◽  
pp. 34-40 ◽  
Author(s):  
Jian Ding ◽  
Lin Qin ◽  
Yong Yan Li ◽  
Wei Min Zhao
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Ignition Temperature ◽  
Oxide Films ◽  
Optimum Composition ◽  
Ignition Point ◽  
Nd Addition ◽  
Fine Microstructure ◽  
Change Tendency

Magnesium alloys are very active and readily ignite during heating and melting. In this study, the ignition-proof property of AZ91D with Nd and Dy addition was discussed, and the effects of these ignition-proof elements on the microstructure and microhardness of AZ91D investigated. The results show that the ignition-proof performance of magnesium alloy is improved obviously. The ignition resistance is attributed to the compact oxide films, which consist of MgO, Al2O3, Nd2O3, Dy2O3. When Dy content increased beyond 0.5%, the change tendency of ignition point of the alloy follows the shape of “v” curve, and the ignition point increased with Nd addition. The optimum composition of the newly developed magnesium alloy is AZ91D-3Nd-0.5Dy with the ignition point about 60K higher than AZ91D. And also AZ91D-3Nd-0.5Dy has fine microstructure and higher microhardness.

Study on Regeneration Ability of Oxidation Film on Ignition-Proof Magnesium Alloy Added with RE

2011 ◽  
Vol 284-286 ◽  
pp. 1665-1670
Author(s):  
Zheng Hua Deng ◽  
Hua Ji Li ◽  
Wei Bin Li
Keyword(s):  
Magnesium Alloy ◽  
Oxide Film ◽  
Room Temperature ◽  
Surface Film ◽  
Surface Oxidation ◽  
Surface Oxide ◽  
Regeneration Ability ◽  
Surface Oxide Film ◽  
Oxidation Performance

The ZM5-0.1%RE magnesium alloy was heated to 800°C, when the surface oxide film was formed, the ZM5-0.1% RE Magnesium alloy which had being oxidized obtained by removing the surface oxidation film on the ZM5-0.1%RE magnesium alloy at room temperature. TGA curve, oxidaxion kinetics curves at constant temperatuers of the alloy and XRD spectrum of the surface film were analyzed in order to investigate the sureface oxidation behavior.The results show that the alloy still has anti-oxidation performance, And the oxide inerease occurred mostly between 400°C and 700°C，a layer of tight oxide film with 4-5.5um and composed of RE2O3, MgO, Al2O3and Mg17Al12was formed on the surface of magnesiurn alloy. The tight surface oxide film prevented the further oxidation of the base magnesiurn alloy, It show that the regeneration ability of oxidation film on ZM5-0.1%RE Magnesium Alloy was good.

Effect of Re Addition on the Ignition Resistance of Pure Magnesium

2014 ◽  
Vol 788 ◽  
pp. 88-92 ◽  
Author(s):  
Jian Ding ◽  
Zheng Fang ◽  
Lin Qin ◽  
Wei Min Zhao
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Oxide Film ◽  
Rare Earth Elements ◽  
Oxidation Resistance ◽  
Rare Earth Oxide ◽  
Pure Magnesium ◽  
Ignition Point ◽  
The Rare Earth

This paper focus on the effect of rare earth elements addition on the oxidation resistance of pure magnesium. The results show that the ignition points of the Mg-RE alloys vary like “V” along with the increase of the rare earth elements. When the content of Y reaches 10wt%, the ignition point of magnesium alloy is 890K, about 40K higher than the ignition point of pure magnesium. After the addition of rare earth elements, dense oxide film forms on the surface of Mg-RE alloys. The outer oxidation film mainly consists of rare earth oxide.

Study on Interfacial Tension and Flammability of Mg-Ca-Ce Alloy Melt

2011 ◽  
Vol 418-420 ◽  
pp. 383-386 ◽  
Author(s):  
Xian Kuo Meng ◽  
Wei Min Zhao ◽  
Jian Ding
Keyword(s):  
Interfacial Tension ◽  
Composite Film ◽  
Flame Retardant ◽  
Ignition Temperature ◽  
Active Element ◽  
Mg Alloy ◽  
Ignition Point ◽  
Surface Active Element ◽  
Surface Active

The Mg-Ca-Ce ignition-proof Mg-alloy with high ignition temperature was developed based on the synergy of flame retardant role of Ca element and Re element ,and the flame retardant mechanism were investigated. The interfacial tension of Mg-Ca-Ce alloy melt was measured with the maximum bubble method. The interfacial tension is found to be remarkably lowered with the increase of Ce element that is a kind of surface active element to Mg-Ca alloy. The results also showed that the compact composite film composed of Ce2O3,CaO and MgO could be formed and reduce the flammability significantly when the Ca content and Re content were 1.2wt.% and 1.5 wt.% respectively, which prevented alloys from oxidation further and raised the ignition point nearly 150°C.

Effect of yttrium addition and the powder size on oxide film and powder ignition temperature of AZ91D magnesium alloy

2009 ◽  
Vol 481 (1-2) ◽  
pp. 373-378 ◽  
Author(s):  
Peng-yu Lin ◽  
Hong Zhou ◽  
Wen-ping Li ◽  
Ming-xing Wang ◽  
Qing-chun Guo ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Oxide Film ◽  
Ignition Temperature ◽  
Powder Size ◽  
Az91d Magnesium Alloy ◽  
Yttrium Addition

Effect of Mg-Nd Master Alloys on Ignition-Proof Performance of AZ91D Magnesium Alloy

2011 ◽  
Vol 214 ◽  
pp. 118-121 ◽  
Author(s):  
Wen Min Zhao ◽  
Yang Zhao ◽  
Zhi Feng Wang ◽  
Yong Yan Li ◽  
Jian Ding ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Oxide Film ◽  
Liquidus Temperature ◽  
Solidus Temperature ◽  
Az91d Alloy ◽  
Ignition Point ◽  
Az91d Magnesium Alloy ◽  
Eds Analysis ◽  
Master Alloys

This paper studied the effect of Mg-Nd alloys on the ignition-proof performance of AZ91D magnesium alloy. The results showed that 0.5%Nd decreased the ignition point of alloy for about 20°C, but the ignition point could been multiplied with the adding of Nd element. When the content of Nd reached 5%, the ignition point increased about 40°C compared with AZ91D alloy. The ignition point reduced after the addition of 0.5%Nd can be attributed to the decrease of the solidus temperature and liquidus temperature. The further analysis indicated Nd and Al formed Al3Nd first, which consumed the content of Nd, so that the alloy didn’t have enough Nd to form Nd2O3 to protecting the alloy. The EDS analysis indicated when the addition of Nd reached 5%, competent Nd2O3 could be formed and compact oxide film which consisted of Nd2O3, MgO and Al2O3 was formed to prevent alloys from oxidation and combustion.

Effects of Gd and Er on the Ignition-Proof Properties of Magnesium Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 122-126
Author(s):  
Zhao Hui Wang ◽  
Xu Dong Wang ◽  
Shu Bo Li ◽  
Wen Bo Du
Keyword(s):  
Magnesium Alloy ◽  
Oxide Layer ◽  
Magnesium Alloys ◽  
Ignition Point

The effects of Gd and Er on ignition-proof behavior of magnesium alloys were investigated. The XRD, SEM and EDS were used to study the ignition-proof performance, oxide products and oxide layer morphology of these alloys. The results indicate that the proper addition of Gd and Er can increase the ignition point of the magnesium alloy. The better ignition-proof property can be obtained after the addition of Er in the Mg-Gd alloy. The mechanism of ignition-proof of magnesium alloy containing Gd and Er are also discussed in this work.

Development of High-Performing Extruded Magnesium Alloy

2016 ◽  
Vol 879 ◽  
pp. 2495-2500
Author(s):  
Hyun Kyu Lim ◽  
Young Kyun Kim ◽  
Bong Hwan Kim ◽  
Dae Kuen Kim ◽  
Young Ok Yoon ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Magnesium Alloys ◽  
Ignition Temperature ◽  
Volume Fraction ◽  
Zinc Content ◽  
High Performing

To develop high-performing extruded magnesium alloys, we had investigated the effect of zinc into Mg-5Gd-2Y-xZn-0.7Ca (x = 1, 2, 3, and 4) alloys. With increasing of zinc content up to 3 wt.%, the volume fraction of LPSO phases and strength increased, while the volume fraction of LPSO and strength rapidly decreased when zinc content was 4 wt.% in Mg-5Gd-2Y-xZn-0.7Ca alloys. Ignition temperature and corrosion rate were directly proportional to the increase of zinc content in this study. The optimum zinc content was 2 wt.% in Mg-5Gd-2Y-xZn-0.7Ca alloys and VWZO52207 alloy exhibited high strengths (TYS: 407 MPa and UTS: 424 MPa), adequate elongation (6.9 %), and high ignition temperature (934 oC).

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