scholarly journals Effects of Different Rare Earth Elements on the Degradation and Mechanical Properties of the ECAP Extruded Mg Alloys

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 627
Author(s):  
Junxiu Chen ◽  
Jie Zhan ◽  
Sharafadeen Kunle Kolawole ◽  
Lili Tan ◽  
Ke Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Microstructural Characterization ◽  
Immersion Test ◽  
Mg Alloys ◽  
Cytotoxicity Test ◽  
Angular Pressing ◽  
Yttrium Addition

Effects of different rare earth elements on the degradation and mechanical properties of the ECAP (equal channel angular pressing) extruded Mg alloys were investigated in this work. Microstructural characterization, thermodynamic calculation, a tensile test, an electrochemical test, an immersion test, a hydrogen evolution test and a cytotoxicity test were carried out. The results showed that yttrium addition was beneficial to the improvement of the alloy’s strength, and the ultimate tensile strength (UTS) and yield strength (YS) values of the ECAPed Mg-2Zn-0.5Y-0.5Zr alloy reached 315 MPa and 295 MPa, respectively. In addition, Nd was beneficial to the corrosion resistance, for which, the corrosion rate of the ECAPed Mg-2Zn-0.5Nd-0.5Zr alloy was observed to be 0.42 ± 0.04 mm/year in Hank’s solution after 14 days of immersion. Gd was moderate in improving both the corrosion resistance and mechanical properties. Moreover, after co-culturing with murine calvarial preosteoblasts (MC3T3-E1) cells, the ECAPed Mg-2Zn-0.5RE (Nd, Gd, Y)-0.5Zr alloys exhibited good cytocompatibility with a grade 1 cytotoxicity. Consequently, the ECAPed Mg-2Zn-0.5Nd-0.5Zr alloy showed the best application prospect in the field of orthopedics.

scholarly journals Microstructure and Properties of Mg-Zn-Y Alloy Powder Compacted by Equal Channel Angular Pressing

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1678 ◽  
Author(s):  
Chun Chiu ◽  
Hong-Min Huang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Equal Channel Angular Pressing ◽  
Volume Fraction ◽  
Cast Alloy ◽  
Milled Powder ◽  
Microstructural Characterization ◽  
Compressive Yield Strength ◽  
Lpso Phase ◽  
Angular Pressing

Mg97Zn1Y2 (at %) alloy with a long period stacking ordered (LPSO) phase has attracted a great deal of attention due to its excellent mechanical properties. It has been reported that this alloy could be fabricated by warm extrusion of rapid solidified alloy powders. In this study, an alternative route combining mechanical milling and equal channel angular pressing (ECAP) was selected to produce the bulk Mg97Zn1Y2 alloy. Microstructural characterization, mechanical properties and corrosion behavior of the ECAP-compacted alloys were studied. The as-cast alloy contained α-Mg and LPSO-Mg12Zn1Y1 phase. In the as-milled powder, the LPSO phase decomposed and formed Mg24Y5 phase. The ECAP-compacted alloy had identical phases to those of the as-milled sample. The compacted alloy exhibited a hardness of 120 HV and a compressive yield strength of 308 MPa, which were higher than those of the as-cast counterpart. The compacted alloy had better corrosion resistance, which was attributed to the reduced volume fraction of the secondary phase resulting in lower microgalvanic corrosion in the compacted alloy. The increase in Y content in the α-Mg matrix also contributed to the improvement of corrosion resistance.

scholarly journals Substitution of Rare Earths in Magnesium Alloys

2016 ◽  
Vol 854 ◽  
pp. 51-56 ◽  
Author(s):  
Roland Hoppe ◽  
Gerrit Kurz ◽  
Dietmar Letzig
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Magnesium Alloys ◽  
Rare Earths ◽  
Heat Treatments ◽  
Supply Situation ◽  
Microstructural Studies

Magnesium alloys containing rare earth elements have better properties in terms of of formability, strength and corrosion resistance. Due to the tight supply situation these elements should be partially or complete substituted, for example by calcium. Microstructural studies of casted alloys of new compositions, and the influence of various heat treatments on their microstructure are investigated. The mechanical properties of the rolled materials are also presented and discussed. The works presented in this paper are results of the ongoing BMBF project SubSEEMag.

scholarly journals Effect of Rare-Earth Elements on the Corrosion Resistance of Flux-Cored Arc-Welded Metal with 10CrNi3MoV Steel

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Kai Wang ◽  
Qinghua Lu ◽  
Zexin Jiang ◽  
Yaoyong Yi ◽  
Jianglong Yi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Electrochemical Impedance ◽  
Hsla Steel ◽  
High Strength ◽  
Cored Wire ◽  
Uniform Microstructure ◽  
Mechanical Properties And Corrosion

We modified the content of rare-earth elements (REE) in the flux-cored wire used to produce welds of high-strength low-alloy (HSLA) steel. The effect of REE addition on the microstructure as well as on the mechanical and electrochemical properties of the welded metal (WM) was investigated. REE-modified welded metals show very different responses during electrochemical impedance spectroscopy and the potentiodynamic polarization tests. The results indicate that the addition of REE of 0.3 wt.% facilitates a more uniform microstructure and improves both mechanical properties and corrosion resistance in welded metals.

The Electrochemical and Immersion Corrosion of Casting Magnesium Alloys Containing Rare Earth Elements

2015 ◽  
Vol 227 ◽  
pp. 79-82
Author(s):  
Andrzej Kiełbus ◽  
Joanna Michalska ◽  
Bartłomiej Dybowski
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Magnesium Alloys ◽  
Electrochemical Corrosion ◽  
Immersion Test ◽  
Pure Magnesium ◽  
Casting Alloys ◽  
Lack Of Information ◽  
Yttrium Addition ◽  
Magnesium Casting

<p>Magnesium alloys are widely used mainly in automotive and aerospace industries. There is quite a lot of information about corrosion of the magnesium alloys in available literature. However, the publications concern mainly Mg-Al alloys, while there is a lack of information about Mg-RE-Zr alloys. The following paper presents results of the investigations on the electrochemical corrosion of magnesium casting alloys containing rare earth elements (WE43, WE54, EV31A-Elektron 21) as well as pure magnesium. The alloys were investigated by immersion test in 3.5% NaCl for times up to 7 days. Electrochemical investigations were carried out at ambient temperature in aerated NaCl solution, using potentiodynamic polarization method. It has been shown that the best corrosion resistance is exhibited by alloys with yttrium addition (WE43, WE54), while the weakest by pure magnesium. EV31A alloy exhibits the highest corrosion rate during the immersion test, while WE54 and WE43 alloys had a similar corrosion behavior.</p>

Research on the Mechanical Properties and Corrosion Resistance of Mg-RE and Mg-Zn-Cu Alloys

2014 ◽  
Vol 633-634 ◽  
pp. 82-85
Author(s):  
Xin Hong Xiong ◽  
Dun Miao Quan ◽  
Jia Lin Chen ◽  
Qiao Xin Zhang ◽  
Yun Chen
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Magnesium Alloys ◽  
Casting Process ◽  
Gravity Casting ◽  
Cu Alloys ◽  
Mechanical Properties And Corrosion

Rare earth magnesium alloys and Mg-Zn-Cu alloys were prepared by gravity casting and direct squeezing casting respectively, and the corrosion performances of three kinds of Mg-Zn-Cu alloys were compared in this paper. The results indicate that adding rare earth elements and direct squeezing casting process can significantly increase the mechanical properties of magnesium alloys, and aluminum can improve the corrosion resistance of magnesium alloys.

scholarly journals Effect of ECAE Die Angle on Microstructure Mechanical Properties and Corrosion Behavior of AZ80/91 Magnesium Alloys

2020 ◽  
Author(s):  
Gajanan Manjunath Naik ◽  
Sachin Bandadka ◽  
Manjaiah Mallaiah ◽  
Ravindra Ishwar Badiger ◽  
Narendranath Sannayellappa
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Material Properties ◽  
Mg Alloys ◽  
Processing Temperature ◽  
Channel Angle ◽  
Angular Pressing ◽  
Mechanical Properties And Corrosion

Magnesium alloys have poor tensile strength, ductility and corrosion resistance properties associated with other engineering materials like aluminum alloys, steels and superalloys etc. Therefore, many researchers worked on equal channel angular pressing of magnesium alloys to improve the mechanical properties and corrosion resistance. In this work, the effect of channel angles on material properties was investigated during equal channel angular pressing of AZ80/91 magnesium alloy using processing route-R at 598 K processing temperature. Channel angles of 900 and 1100, common corner angle of 300 have been considered for the study. It has been revealed that the channel angle has a significant influence on deformation homogeneity, microhardness, ultimate tensile strength, ductility, and corrosion behavior of AZ80/91 magnesium alloys. Specifically, AZ80/91 Mg alloys processed through 900 channel angle i.e. die A is considered as optimal die parameter to improve above-said material properties. Investigation showing concerning as-received AZ80 and AZ91 Mg alloy indicates 11%, 14% improvement of UTS and 69%, 59% enhancement in ductility after processing through 4P through die A (90°) at 598 K respectively. Also, the corrosion rate reduces to 97% and 99% after processing the sample with 4P-ECAP die A (90°) at the same processing temperature for AZ80 and AZ91 Mg alloys respectively. This is mainly due to grain refinement and distribution of Mg17Al12 secondary phase during ECAP.

Influence of Conversion Coating Conditions with Rare Earth Elements on Corrosion Resistance of Mg Alloys

2019 ◽  
Vol 16 (43) ◽  
pp. 39-46 ◽  
Author(s):  
Nobuo Uesaka ◽  
Yuichi Shikai ◽  
Toshihide Takenaka
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Conversion Coating ◽  
Mg Alloys

Influence of Sand-Casting Parameters on Microstructure and Properties of Magnesium Alloys

2013 ◽  
Vol 58 (2) ◽  
pp. 635-640 ◽  
Author(s):  
A. Kiełbus ◽  
M. Stopyra ◽  
R. Jarosz
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Volume Fraction ◽  
Positive Influence ◽  
Sand Casting ◽  
Mg Alloys ◽  
Protective Atmosphere ◽  
Linear Contraction ◽  
Alloy Properties

The paper present the influence of modifying process on chemical composition, microstructure, and selected properties of Mg alloys. Two sand-casting creep-resistant alloys, Elektron 21 and WE43, were analyzed in various forms: without modifiers, with the amount of modifier suggested by the producer, and with this amount increased by 50% and 100%. The volume fraction of eutectic areas, tensile strength, and yield strength were measured and the fluidity and linear contraction were analyzed. The research shows that, in contrast to what is widely assumed to be a positive influence of rare-earth elements on Mg alloys properties, a large increase in the amount of modifiers does not always lead to an improvement in the alloy properties. However, the results are tentative because they may have been influenced by the melting technology used, which can be improved. Rare-earth elements tend to react with fluxes, which could lead to a decrease in mechanical properties and fluidity. More research is planned wherein the alloys are melted under a protective atmosphere.

Structure and Mechanical Properties of Mg-Zn-RE System Alloys

2007 ◽  
Vol 561-565 ◽  
pp. 199-202 ◽  
Author(s):  
Jie Yang ◽  
Jun Wang ◽  
Wen Long Xiao ◽  
Li Dong Wang ◽  
Yao Ming Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
High Strength ◽  
Mg Alloys ◽  
Pure Form ◽  
Important Class ◽  
The Future ◽  
Low Strength

The lightest density of Mg has stimulated renewed interest in Mg based alloys for applications in the automotive, aerospace and communications industries. However, Mg in the pure form has relatively low strength, limited ductility and is susceptible to corrosion. Great efforts have been made to improve the mechanical properties of Mg alloys. Alloying Mg with other elements is one of the most important methods. An important class of Mg alloys is the Mg-Zn-RE system (RE = rare earth elements). In recent few decades, a series of new Mg-Zn-RE system alloys have been obtained, and detailed the structure and mechanical properties of the alloys. In this paper, the structure and mechanical properties of the Mg-Zn-RE alloys have been summarized. It showed that these alloys have high strength and they are prospected to be widely used in the future.

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