Căutare după Autor "Gurău, Carmela"

Afișează articolele 1-12 of 12

    • Effects of Plastic Deformation and Temperature on Microstructural and Mechanical Properties of a CuAlNi Shape Memory Alloy 

      Gurău, Carmela; Gurău, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 2009)
      In Cu 12.88% wt.Al4 %wt. Ni shape memory alloy the influence of plastic deformation and thermal treatments on the microstructures and hardness were studied by optical microscopy, scanning electron microscopy (SEM), ...

    • Evolution of Copper Microstructure Subjected to Equal Channel Angular Pressing 

      Gurău, Carmela; Gurau, Gheorghe (Universitatea "Dunărea de Jos" din Galaţi, 2012)
      This paper aims to study bulk severe plastic deformation processes capable to produce ultrafine grain and also nanostructured 3D materials, interesting for processing in current industry. Samples of copper alloy were ...

    • Fabrication of Ultrafine Low Carbon Metallic Multilayer by Accumulative Roll Bonding 

      Gurău, Carmela; Gurău, Gheorghe; Gurău, Lidia; Alexandru, Petrică (Universitatea "Dunărea de Jos" din Galaţi, 2014)
      The effect of grain refinements by Accumulative Roll Bonding (ARB) was investigated on low carbon steel. Optical microscopy (OM) and microhardness tests were used to check the phase changes and hardness before and after ...

    • Kinetic of Martensite Transformation in a Cu-13wt. %Al-4 wt.%Ni Shape Memory Alloy 

      Gurău, Gheorghe; Gurău, Carmela; Andronache, N. (Universitatea "Dunărea de Jos" din Galați, 2006)
      In this paper we present some results was obtained on the Cu-13wt. %Al-4 wt. %Ni shape memory alloy. This alloy was elaborated by a classic melting method starting at pure metals. A DSC analysis was made for quenched ...

    • Microstructural Evolution of al 1100 Aluminum Subjected to Severe Plastic Deformation 

      Gurău, Gheorghe; Gurău, Carmela (Universitatea "Dunărea de Jos" din Galaţi, 2012)
      The goal of this document is to promote a sequence of bulk-deformation processes able to produce ultrafine grain and also nanostructured wires with adequate length to be interesting for processing in metallurgical industry. ...

    • Processing Smart Wires from Cu-Al-Ni System 

      Gurău, Carmela; Gurău, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 2006)
      In this paper we present some results concerning plastic deformation applied to shape memory alloy and two most direct characterization methods for shape memory. We work with a copper based alloy- Cu Al13Ni 4. Over eight ...

    • Severe Plastic Deformation an Advanced Method for Nanostructuring Shape Memory Alloys 

      Gurău, Gheorghe; Gurău, Carmela; Tănase, Dinel; Drugescu, Elena (Universitatea "Dunărea de Jos" din Galați, 2007)
      Severe plastic deformation (SPD) is an advanced plastic deformation. In this process nanostructuring metals and alloys may be produced. Nanostructured shape memory alloys are associate with a very high strength, toughness, ...

    • Severe Plastic Deformed Pure Aluminum by Equal Channel Angular Pressing 

      Gurău, Gheorghe; Gurău, Carmela; Tănase, Dinel (Universitatea "Dunărea de Jos" din Galați, 2009)
      Samples of an aluminum alloy were subjected to an equal channel angular pressing (ECAP) at room temperature for one pass. For the several specimens severe plastic deformation process was interrupted to observe the material ...

    • Study of Severe Plastic Deformation by Torsion Test 

      Gurău, Carmela; Gurău, Gheorghe; Cănănău, Nicolae (Universitatea "Dunărea de Jos" din Galaţi, 2008)
      High Torsion Pressure (HPT) is an advanced tool for inducing very significant grain refinement in a wide range of metals. In this research were studied parameters of severe plastic deformation using the torsion test. The ...

    • The temperature Effect on Severely Deformed Aluminium by High Pressure Torsion 

      Gurău, Carmela; Gurău, Gheorghe; Cănănău, Nicolae; Potecașu, Florentina; Dogaru, Victor; Fernandes, FM Braz (Universitatea "Dunărea de Jos" din Galați, 2009)
      The process of deforming materials started to attract the interest of the researchers after the development of the severe plastic deformation techniques. A number of aluminium samples were severe deformed by HPT method ...

    • Two-Way Shape memory Effect in a Cu-13wt. %Al-4 wt.%Ni Shape Memory alloy by the Thermo-Mechanical Cycling Method 

      Gurău, Carmela; Gurău, Gheorghe; Alexandru, Petrică (Universitatea "Dunărea de Jos" din Galați, 2007)
      A Cu - 13 % wt Al 4% wt Ni polycrystalline shape memory alloy has studied with a thermo mechanical cycling method. The two – way shape memory effect (TWSME) was obtained bending the alloy around a cylinder mold and by ...

    • X-Ray Diffraction Study of the Rewverse Martensitic Transformation in Cu-Al-Ni Shape Memory Alloy 

      Gurău, Carmela; Gurău, Gheorghe; Fernandes, F. M. Braz (Universitatea "Dunărea de Jos" din Galaţi, 2008)
      The paper presents an X ray diffraction study for a cooper based shape memory alloy. The behavior of CuAl13Ni4 alloy, which exhibits a peculiar property, is evaluated by structural changes. On cooling, the martensitic ...