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Journal of magnesium and alloys 12건

  1. [해외논문]   GFA  


    Journal of magnesium and alloys v.6 no.2 ,pp. III - VI , 2018 ,

    초록

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  2. [해외논문]   Fabrication of ultra-high strength magnesium alloys over 540 MPa with low alloying concentration by double continuously extrusion  

    Huang, Hua (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China ) , Miao, Hongwei (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China ) , Yuan, Guangyin (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China ) , Wang, Zhongchang (Department of Quantum Materials Science and Technology, International Iberian Nanotechnology Laboratory (INL), Av. Mestre José) , Ding, Wenjiang (Veiga s/n, Braga, Portugal )
    Journal of magnesium and alloys v.6 no.2 ,pp. 107 - 113 , 2018 ,

    초록

    Abstract We prepare a new type of patented biodegradable biomedical Mg–Nd–Zn–Zr (JDBM) alloy system and impose double continuously extrusion (DCE) processing. The lowest processing temperature is 250 °C for JDBM-2.1Nd and 310 °C for JDBM-2.8Nd, which increases with the Nd concentration. The highest yield strength of 541 MPa is achieved in JDBM-2.1 Nd samples when extruded at 250 °C and the elongation is about 3.7%. Moreover, the alloy with a lower alloying element content can reach a higher yield strength while that with a higher alloying element content can reach a larger elongation after DCE processing. However, when extruded under the same conditions, the alloy with a higher alloying contents exhibits better tensile properties.

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  3. [해외논문]   A study on joining magnesium alloy high pressure die casting components with thread forming fasteners  

    Wang, Gerry Gang (Corresponding author.) , Bos, Jeremy
    Journal of magnesium and alloys v.6 no.2 ,pp. 114 - 120 , 2018 ,

    초록

    Abstract With tremendous weight saving potential, magnesium alloy high pressure die casting components have been widely used for automotive applications. Magnesium fastening technology is thus becoming increasingly important to design engineers. Joining as-cast holes of magnesium high pressure die casting components with thread forming fasteners provides significant advantages for the assembly process, overall cost benefit and joint integrity. This type of joint is thus preferred for structural applications. Designing the thread forming fasteners with as-cast holes follows the general rules for designing for the machined holes, including carefully designing the variables such as the assembly torque range, the length of thread engagement, the hole diameter and required failure mode. In addition, special attention needs to be paid to the draft angles of the magnesium cast components that are required for the die casting process. In this paper, the effects of above key factors, individually and combined, on the joint performance of thread forming fasteners with as-cast blind holes of AM60B magnesium components are studied. A joint design philosophy was proposed to optimize both joint performance (the prevailing torque, the failure torque and the failure mode) and manufacturing easiness (the hole diameter and corresponding draft angle). The detailed design considerations for as-cast holes of magnesium HPDC are discussed and explained through a hypothetical example.

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  4. [해외논문]   Effects of cold and warm cross-rolling on microstructure and texture evolution of AZ31B magnesium alloy sheet  

    Catorceno, Litzy Lina Choquechambi (Department of Metallurgical and Materials Engineering, Federal University of Ceará) , de Abreu, Hamilton Ferreira Gomes (- UFC, Campus do Pici - Bloco 729, CEP 60440-554 Fortaleza, CE, Brazil ) , Padilha, Angelo Fernando (Department of Metallurgical and Materials Engineering, Federal University of Ceará)
    Journal of magnesium and alloys v.6 no.2 ,pp. 121 - 133 , 2018 ,

    초록

    Abstract Mg alloys conventionally rolled often present strong basal textures that affect negatively further deformations, limiting their applications. The present research found that cross-rolling experiences in adequate conditions can weaken those intense basal textures as a result of the interaction of deformation mechanisms and dynamic recrystallization. The effects of rolling temperature and strain rate on the microstructure and texture of an AZ31B magnesium alloy sheet generated heterogeneous microstructure where the initial basal texture was strengthened during cold cross-rolling and it was gradually weakening by the rolling reduction and the rolling temperature increases in such a way that a rather weak basal fiber was produced applying reductions higher than 15% at temperatures higher than 200 °C. Their ODF functions supported the texture weakening, exhibiting a combination of two crystallographic orientations represented by {0001} and {0001}⟨1 0 1 ¯ 0⟩.

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  5. [해외논문]   Modeling of hot deformation behavior and prediction of flow stress in a magnesium alloy using constitutive equation and artificial neural network (ANN) model  

    Sani, S. Aliakbari (School of materials and metallurgical engineering, Iran University of science and technology (IUST), Narmak, Tehran, Iran ) , Ebrahimi, G.R. (Materials and Polymers Engineering Department, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran ) , Vafaeenezhad, H. (School of materials and metallurgical engineering, Iran University of science and technology (IUST), Narmak, Tehran, Iran ) , Kiani-Rashid, A.R. (Department of Metallurgical and Materials Engineering, Faculty of Engineering, Ferdowsi university of Mashhad, Mashhad, Iran)
    Journal of magnesium and alloys v.6 no.2 ,pp. 134 - 144 , 2018 ,

    초록

    Abstract The aim of the present study was to investigate the modeling and prediction of the high temperature flow characteristics of a cast magnesium (Mg–Al–Ca) alloy by both constitutive equation and ANN model. Toward this end, hot compression experiments were performed in 250–450 °C and in strain rates of 0.001–1 s −1 . The true stress of alloy was first and foremost described by the hyperbolic sine function in an Arrhenius-type of constitutive equation taking the effects of strain, strain rate and temperature into account. Predictions indicated that unlike low strain rates and high temperature with dominant DRX activation, in relatively high strain rate and low temperature values, the precision of the models become decreased due to activation of twinning phenomenon. At that moment and for a better evaluation of twinning effect during deformation, a feed-forward back propagation ANN was developed to study the flow behavior of the investigated alloy. Then, the performance of the two suggested models has been assessed using a statistical criterion. The comparative assessment of the gained results specifies that the well-trained ANN is much more precise and accurate than the constitutive equations in predicting the hot flow behavior.

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  6. [해외논문]   Development and characterization studies on magnesium alloy (RZ 5) surface metal matrix composites through friction stir processing  

    Vedabouriswaran, G. (Corresponding author.) , Aravindan, S.
    Journal of magnesium and alloys v.6 no.2 ,pp. 145 - 163 , 2018 ,

    초록

    Abstract Surface metal matrix composite is produced on the as cast Magnesium Rare Earth alloy – RZ 5 by single pass friction stir processing using various micro/nano sized reinforcement particles namely Boron Carbide (B 4 C), Multi Walled Carbon Nano Tubes (MWCNTs), and a mixture of ZrO 2 + Al 2 O 3 particles. Fine grained metal matrix composites having the grain size ranging 0.8 μm to 1.87 μm are achieved. Grain boundary pinning by the reinforcement particles has resulted in the transformation of coarse grained (∼81 μm) base material into fine grained (

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  7. [해외논문]   Microstructure and mechanical properties of bio-inspired Cf/Ti/Mg laminated composites  

    Hu, Xiaoshi (Corresponding author.) , Sun, Zhenming , Zhang, Chunlei , Wang, Xiaojun , Wu, Kun
    Journal of magnesium and alloys v.6 no.2 ,pp. 164 - 170 , 2018 ,

    초록

    Abstract Inspired by an old fish skin structure, the Cf/Ti/Mg laminated composites were fabricated by squeeze casting technology. No porous or voids were found in final composite, and carbon fiber was uniformly dispersed in Mg matrix. Furthermore, the addition of net-shaped Ti adsorbed Al element and facilitated the nucleation of Mg 17 Al 12 nearby Ti. The reaction product Al 4 C 3 was found at the Cf and AZ91 interface. Mechanical tests indicate that the introduction of Ti could greatly improve the toughness of Cf/Mg composites.

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  8. [해외논문]   Optimization of PVD process parameter for coating AZ91D magnesium alloy by Taguchi grey approach  

    Sivapragash, M. (Department of Mechanical Engineering, PSN College of Engineering and Technology, Tirunelveli, Tamilnadu, India ) , Kumaradhas, P. (Department of Mechanical Engineering, Noorul Islam Centre for Higher Education, Tamilnadu, India ) , Vettivel, S.C. (Department of Mechanical Engineering, Chandigarh College of Engineering and Technology (Degree Wing), Sector 26, Chandigarh 160019, India ) , Retnam, B. Stanly Jones (Department of Automobile Engineering, Noorul Islam Centre for Higher Education, Tamilnadu, India)
    Journal of magnesium and alloys v.6 no.2 ,pp. 171 - 179 , 2018 ,

    초록

    Abstract This study was an attempt made to explore the possibility of increasing the surface properties of the AZ91D magnesium alloy by applying ZrO 2 coating using Physical Vapour Deposition (PVD-RF) sputtering process. In order to improve the quality of the coating, the PVD process parameter with multiple performance characteristics was optimized by using the Taguchi grey approach. L 18 orthogonal array was selected for conducting the experiments. The proposed Taguchi grey method was find out the optimal process parameter for multiple performance characteristics. The optimal combination was attained at chamber pressure of 0.003 bar, argon gas in millibar and power input of 200 W. The validation experiment result shows an improvement in the micro hardness and surface finish. Also, the performance characterizations such as SEM, EDX, XRD, coating thickness, surface roughness and micro hardness were measured at optimal process parameter.

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  9. [해외논문]   The flow behavior in as-extruded AZ31 magnesium alloy under impact loading  

    Zhu, Biwu (Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, China ) , Liu, Xiao (Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, China ) , Xie, Chao (The Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China ) , Liu, Wenhui (Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, China ) , Tang, Changping (Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, China ) , Lu, Liwei (Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, China)
    Journal of magnesium and alloys v.6 no.2 ,pp. 180 - 188 , 2018 ,

    초록

    Abstract As-extruded AZ31 magnesium alloy samples were compressed at ambient temperature and strain rates of 1000–3000 s −1 . The fracture surfaces of cracked samples, the evolution of microstructures and macrotextures were detected. The received flow curves exhibit an abnormal behavior at strain rates above 1500 s −1 . A strain constitutive model based on strain equivalent principle was applied to analyze the flow curves of the damaged samples. The results indicate that the abnormal flow behaviors of the fractured samples are related to the increasing area of crack surfaces, and kinetic energy during dynamic crack nucleation and propagation. The initiation of the micro-crack also causes obvious flow softening in the cracked samples. The shapes of flow stresses of the intact samples are affected by twinning.

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  10. [해외논문]   Full potential study of HoMg  

    Kumari, Meena (Corresponding author.) , Verma, U.P.
    Journal of magnesium and alloys v.6 no.2 ,pp. 189 - 196 , 2018 ,

    초록

    Abstract In this paper, HoMg is studied in two different phases i.e. B1 and B2. The calculated lattice constants in B1 and B2 phases are 6.39 A and 3.78 A and corresponding energies are −25,648.49 Ry and −25,648.56 Ry, respectively. It is more stable in B2 phase ( Pm-3m configuration with no. 221). The analysis of the obtained band structure and density of states shows metallic character of HoMg. Detailed information about the elastic properties is also presented in this paper. The calculated values of Cauchy pressure, G/B and Poisson ratio are −10.72, 0.58 and 0.26, respectively which indicates that HoMg have brittle character. Calculations for the optical spectra such as the components of dielectric function, refractive index and other parameters of the optical properties are performed in the energy range of 0–20 eV. For HoMg, the main peak of absorption spectra and energy loss function is located at 7.44 eV and 11.76 eV, respectively. Thermal parameters such as Gruneisen parameter, Debye temperature, Specific heat etc. have been reported as a function of pressure and temperature.

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