The Influence of Eutectic Morphology on the Impact Properties of High Pressure Die Cast Mg-Rare-Earth Alloys

2010 ◽  
Vol 654-656 ◽  
pp. 683-686 ◽  
Author(s):  
Mark Easton ◽  
Katharina Strobel ◽  
Su Ming Zhu ◽  
Mark A. Gibson ◽  
Jian Feng Nie
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Eutectic Structure ◽  
Rare Earth Alloys ◽  
Impact Properties ◽  
Die Cast ◽  
Eutectic Morphology ◽  
The Impact ◽  
Lamellar Eutectic Structure ◽  
Better Than

The impact properties of high-pressure die cast Mg-RE alloys were investigated. It was found that, for rare earth contents between 2-4 wt.%, the Mg-La and Mg-Nd alloys performed better than the Mg-Ce alloys in un-notched tests. The notched results appear to be related to the amount of intermetallic. In contrast, the un-notched results indicate that at some compositions the Mg-La alloys out-performed the other alloys when compared to the amount of intermetallic. It was apparent that a lamellar eutectic structure can improve the un-notched impact properties of Mg-RE based alloys even when this is not evidenced in tensile test or notched impact results.

scholarly journals The Microstructure and Property of the Heat Affected zone in C-Mn Steel Treated by Rare Earth

2019 ◽  
Vol 38 (2019) ◽  
pp. 362-369 ◽  
Author(s):  
Ming-ming Song ◽  
Yu-min Xie ◽  
Bo Song ◽  
Zheng-liang Xue ◽  
Nan Nie ◽  
...  
Keyword(s):  
Rare Earth ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Acicular Ferrite ◽  
Steel Matrix ◽  
Impact Properties ◽  
Treated Steel ◽  
The Impact ◽  
Welding Processes ◽  
Mn Steel

AbstractThe microstructures and impact properties of the heat affected zone (HAZ) in steel treated by rare earth (RE) under different welding processes were discussed. The effect of Al on the impact properties of the HAZ in RE treated steel was analyzed. It finds that when the welding t8/5 is smaller than 111 s, the main microstructure in steels is bainite/widmanstatten. The impact toughness of the HAZ is lower than that of the steel matrix. When t8/5 is more than 250 s, the microstructure is mainly acicular ferrite (AF) in the steel treated by RE, and the impact toughness of HAZ is obviously improved. Even under the welding processing with t8/5 about 600 s in RE treated steel can still obtain a lot of AF. While in the steel killed by Al and treated by RE, the main microstructure is parallel cluster of bainite/widmanstatten, and the impact toughness of HAZ is significantly lower than that of low-Al RE treated steel. Al can deteriorate the optimizing of RE treatment on HAZ.

scholarly journals Partial and Total Solvent-Free Limonene’s Hydrogenation: Metals, Supports, Pressure, and Water Effects

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Fanta J. Ndongou Moutombi ◽  
Anne-Sylvie Fabiano-Tixier ◽  
Olivier Clarisse ◽  
Farid Chemat ◽  
Mohamed Touaibia
Keyword(s):  
High Pressure ◽  
Rosmarinic Acid ◽  
Hydrogen Pressure ◽  
Heterogeneous Catalysts ◽  
Solvent Free ◽  
Partial Hydrogenation ◽  
Water Addition ◽  
Water Effects ◽  
The Impact ◽  
Better Than

Bio-based solvents menthene and menthane were obtained through limonene’s partial and total hydrogenation under various catalytic conditions. Heterogeneous catalysts based on different active metals and supports (carbon, alumina, and silica) were systematically tested for solvent-free total and partial hydrogenation of limonene under high and low hydrogen pressure. Influences of these catalysts on the formation of menthene, menthane, and cymene, a dehydrogenated product, were determined. The impact of water addition on the conversion and selectivity of the catalysts was also investigated. Amongst all tested catalysts, Rh/Alumina which was never tested for total and partial hydrogenation of limonene was the most effective as 1-menthene was quantitatively produced at low pressure (0.275 MPa) while menthane was mostly obtained at a higher pressure (2.75 MPa). Water addition on Rh/Alumina favoured menthene production even at high pressure. To propose menthane, menthene, and menthane/menthene mixture as an alternative to fossil-based solvents such as n-hexane for the extraction of natural products, β-carotene, vanillin, and rosmarinic acid solubilizations have been investigated. If a modeling approach using COSMO-RS software predicted a comparable solubilization of these 3 compounds for the 3 solvents, experimental assays revealed that menthene solubilizes β-carotene, vanillin, and rosmarinic acid three to five times better than n-hexane.

An A Priori Hot-Tearing Indicator Applied to Die-Cast Magnesium-Rare Earth Alloys

2014 ◽  
Vol 45 (8) ◽  
pp. 3586-3595 ◽  
Author(s):  
Mark A. Easton ◽  
Mark A. Gibson ◽  
Suming Zhu ◽  
Trevor B. Abbott
Keyword(s):  
Rare Earth ◽  
A Priori ◽  
Hot Tearing ◽  
Rare Earth Alloys ◽  
Die Cast ◽  
Cast Magnesium ◽  
Hot Tearing Indicator

Microstructure and property evaluation of high-pressure die-cast Mg–La–rare earth (Nd, Y or Gd) alloys

2014 ◽  
Vol 597 ◽  
pp. 21-29 ◽  
Author(s):  
Serge Gavras ◽  
Mark A. Easton ◽  
Mark A. Gibson ◽  
Suming Zhu ◽  
Jian-Feng Nie
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Property Evaluation ◽  
Die Cast

scholarly journals INFLUENCE OF RARE-EARTH ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIGH MANGANESE STEEL UNDER IMPACT LOAD

2019 ◽  
Vol 25 (3) ◽  
pp. 158
Author(s):  
Nam Duong Nguyen ◽  
Nguyen Duong Nguyen ◽  
Khanh Mai Pham
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Impact Strength ◽  
Impact Load ◽  
Manganese Steel ◽  
High Manganese ◽  
High Manganese Steel ◽  
Microstructure And Mechanical Properties ◽  
The Impact ◽  
Better Than

<span class="fontstyle0">In this paper, the influence of rare earth (RE) on the microstructure and mechanical properties of austenitic high manganese steel (HMnS) Mn15Cr2V were investigated. The results showed that the microstructure, hardness and impact strength of RE modification sample is finer and better than non-modified sample. Under the effect of impact load, the hardness and the depth of the work-hardening layer of the modified steel was higher than that of the non-modified steel, thereby, the value of microhardness in the surface of the modified sample was 420 HV while it was only 395 HV in the non-modified sample. The value of the impact strength of the modified sample was up to 132J/cm</span><span class="fontstyle0">2 </span><span class="fontstyle0">compared to the non-modified sample is only 115J/cm</span><span class="fontstyle0">2</span><span class="fontstyle0">. Moreover, after impact load, the austenite nanoparticles had been found out on the surface of this steel, this is the cause of the increasing of mechanical properties in this steel.</span> <br /><br />

scholarly journals The Study of A New Symmetrical Rod Phase in Mg-Zn-Gd Alloys

Symmetry ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 988
Author(s):  
Yue ◽  
Feng ◽  
Wu ◽  
Zhou ◽  
Zuo ◽  
...  
Keyword(s):  
Ternary Phase ◽  
Eutectic Structure ◽  
New Materials ◽  
Casting Method ◽  
Scanning Calorimetry ◽  
Specific Strength ◽  
High Specific Strength ◽  
Eds Analysis ◽  
Lamellar Eutectic Structure ◽  
Better Than

Quasicrystal alloys have a wide application prospect because of excellent performances and characteristics; meanwhile, magnesium alloys are known as green engineering materials because of their high specific strength and light weight. Therefore, the study of Mg-Zn-Gd quasicrystal alloys is of great significance for the development of new materials. In this paper, Mg(70-x)Zn30Gdx(x=3,4,5) alloys were prepared by a conventional casting method and the morphologies and properties of these alloys were studied. There was a new symmetrical rod phase found in the Mg66Zn30Gd4 alloy and the symmetrical rod phase was identified as a ternary phase by mapping scanning and energy dispersive spectroscopy (EDS) analysis. The Zn/Gd ratio of the symmetrical rod phase was found to be 4.8 and the TEM images obtained were different from the typical diffraction spots patterns of quasicrystalline, which means it is unlikely to be quasicrystalline. With different melt holding time, the symmetrical rod phase evolved gradually over time from a lamellar eutectic structure; differential scanning calorimetry (DSC), heat treatment, and microhardness tests showed that the melting temperature of the rod phase was 453 °C and that its thermal stability and microhardness are better than quasicrystalline. Hence, the symmetrical rod phase is a new kind of complex metallic alloy phase whose composition and properties are close to those of quasicrystals but is not quasicrystalline.

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