Mössbauer and magnetometric studies of the magnetism of quasi-ordered Fe-Al alloys with Ga, v and Mn admixtures

The introduction of additives of Ga, V and Mn (M x,y = 0, 5, 10 at %) to ordered alloys Fe65Al35-Fe65 - y Al35 - x M x,y is aimed at studying the general and specific features of the magnetic characteristics of these alloys as functions of their temperatures (5-300 K) and magnetic fields (up to 5 T). In this work, we discuss the possibiliy of interpreting the combined results from magnetometry and Mössbauer spectroscopy in terms of magnetic phase separation and models of localized magnetic moments. © 2013 Allerton Press, Inc

Effect of the method for producing Cu-Cr3C2 bulk composites on the structure and properties

Copper-chromium carbide composites containing a carbide phase of 20-30 vol% were obtained with the use of solid- and liquid-phase mechanosyntheses, followed by magnetic pulse compaction (MPC) and spark plasma sintering. The morphology, structural-phase composition, density, hardness and electrical conductivity of the composites were investigated. The structure of composites obtained by MPC represents regions of copper matrix hardened by superfine carbide precipitates surrounded by a layer of chromium carbide. In the composites obtained by spark plasma sintering, the copper matrix hardened by superfine carbide precipitates was divided into areas surrounded by a copper-chromium layer. A composite obtained by the MPC of the powders synthesized using solid-phase mechanosynthesis (MS) (copper, chromium and graphite) had the highest values ofVickers microhardness (4.6GPa) and Rockwell hardness (HRA 69). The best value of electrical conductivity (36% IACS) was achieved using liquid-phase MS (copper, chromium and xylene) and spark plasma sintering. Liquid-phase MS is the only way to synthesize the powder with a small amount of the carbide phase and without contamination. © 2017 Indian Academy of Sciences.Government Council on Grants, Russian FederationFederal Agency for Scientific Organizations: 0428-2014-0002, 0389-2014-0002This work was supported by the Government of the Russian Federation (Federal Agency for Scientific Organizations) under the themes of the state task, no. 0389-2014-0002 and no. 0428-2014-0002 and by the Program of UD RAS, Project reg. no. AAAA-A17-117040610324-3

The effect of dopants on magnetic properties of the ordered FE 65-XAL35-YMX,Y (MX,Y=GA,B,V; X,Y=5,10) alloys

The results of X-ray diffraction, complex in-field (up to 9 T) and temperature (5-300 K) Mössbauer and magnetometric studies of the ordered Fe65Al35-xMx (M=Ga, B; x=0,5,10) and Fe 65-xVxAl35(x=5,10) alloys are presented. Analysis of the magnetometry studies shows that the systems Fe 65Al35 H Fe65Al35-xGax (x=5, 10) are characterized by two different magnetic states with essentially distinguishing hysteresis loops and AC susceptibility values. The temperature and external magnetic field values inducing the transition from one magnetic state to another are higher in the Ga-doped alloys than in the reference Fe 65Al35 alloy. The boron addition transforms the magnetic state of the initial alloy Fe65Al35 into a ferromagnetic one exhibiting high magnetic characteristics. Substitution of V for Fe in the ternary alloys Fe65-xVxAl35 results in reduction of magnetic characteristics and collapsing of 57Fe hyperfine magnetic filed. © (2012) Trans Tech Publications

Mössbauer and magnetometric studies of the magnetism of quasi-ordered Fe-Al alloys with Ga, v and Mn admixtures

The introduction of additives of Ga, V and Mn (M x,y = 0, 5, 10 at %) to ordered alloys Fe65Al35-Fe65 - y Al35 - x M x,y is aimed at studying the general and specific features of the magnetic characteristics of these alloys as functions of their temperatures (5-300 K) and magnetic fields (up to 5 T). In this work, we discuss the possibiliy of interpreting the combined results from magnetometry and Mössbauer spectroscopy in terms of magnetic phase separation and models of localized magnetic moments. © 2013 Allerton Press, Inc

Mössbauer and magnetometric studies of the magnetism of quasi-ordered Fe-Al alloys with Ga, v and Mn admixtures

The introduction of additives of Ga, V and Mn (M x,y = 0, 5, 10 at %) to ordered alloys Fe65Al35-Fe65 - y Al35 - x M x,y is aimed at studying the general and specific features of the magnetic characteristics of these alloys as functions of their temperatures (5-300 K) and magnetic fields (up to 5 T). In this work, we discuss the possibiliy of interpreting the combined results from magnetometry and Mössbauer spectroscopy in terms of magnetic phase separation and models of localized magnetic moments. © 2013 Allerton Press, Inc

Mössbauer and magnetometric studies of the magnetism of quasi-ordered Fe-Al alloys with Ga, v and Mn admixtures

The introduction of additives of Ga, V and Mn (M x,y = 0, 5, 10 at %) to ordered alloys Fe65Al35-Fe65 - y Al35 - x M x,y is aimed at studying the general and specific features of the magnetic characteristics of these alloys as functions of their temperatures (5-300 K) and magnetic fields (up to 5 T). In this work, we discuss the possibiliy of interpreting the combined results from magnetometry and Mössbauer spectroscopy in terms of magnetic phase separation and models of localized magnetic moments. © 2013 Allerton Press, Inc

Cu−Fe3C(Cr3C2)Cu-Fe_3C(Cr_3C_2) Bulk Nanocomposites Prepared by Mechanosynthesis Followed by Magnetic Pulse Compaction

The $Cu-Fe_3$ and $Cu-Cr_3C_2$ bulk nanocomposites are prepared by consolidation of the mechanically alloyed powders. The structure and properties (density, Vickers microhardness and electrical conductivity) of them have been studied. It is shown that microhardness is equal to 236 HV and 470 HV for a Cu-5 vol.% carbide phase and for a Cu-30 vol.% carbide phase, respectively. The microhardness which can be influenced by the heat treatment temperature depends on the grain size of the Cu matrix. The electrical conductivity values of 38-44% IACS (International Annealing Copper Standard) at room temperature have been found

The effect of dopants on magnetic properties of the ordered FE 65-XAL35-YMX,Y (MX,Y=GA,B,V; X,Y=5,10) alloys

The results of X-ray diffraction, complex in-field (up to 9 T) and temperature (5-300 K) Mössbauer and magnetometric studies of the ordered Fe65Al35-xMx (M=Ga, B; x=0,5,10) and Fe 65-xVxAl35(x=5,10) alloys are presented. Analysis of the magnetometry studies shows that the systems Fe 65Al35 H Fe65Al35-xGax (x=5, 10) are characterized by two different magnetic states with essentially distinguishing hysteresis loops and AC susceptibility values. The temperature and external magnetic field values inducing the transition from one magnetic state to another are higher in the Ga-doped alloys than in the reference Fe 65Al35 alloy. The boron addition transforms the magnetic state of the initial alloy Fe65Al35 into a ferromagnetic one exhibiting high magnetic characteristics. Substitution of V for Fe in the ternary alloys Fe65-xVxAl35 results in reduction of magnetic characteristics and collapsing of 57Fe hyperfine magnetic filed. © (2012) Trans Tech Publications

The effect of dopants on magnetic properties of the ordered FE 65-XAL35-YMX,Y (MX,Y=GA,B,V; X,Y=5,10) alloys

The results of X-ray diffraction, complex in-field (up to 9 T) and temperature (5-300 K) Mössbauer and magnetometric studies of the ordered Fe65Al35-xMx (M=Ga, B; x=0,5,10) and Fe 65-xVxAl35(x=5,10) alloys are presented. Analysis of the magnetometry studies shows that the systems Fe 65Al35 H Fe65Al35-xGax (x=5, 10) are characterized by two different magnetic states with essentially distinguishing hysteresis loops and AC susceptibility values. The temperature and external magnetic field values inducing the transition from one magnetic state to another are higher in the Ga-doped alloys than in the reference Fe 65Al35 alloy. The boron addition transforms the magnetic state of the initial alloy Fe65Al35 into a ferromagnetic one exhibiting high magnetic characteristics. Substitution of V for Fe in the ternary alloys Fe65-xVxAl35 results in reduction of magnetic characteristics and collapsing of 57Fe hyperfine magnetic filed. © (2012) Trans Tech Publications