Počet záznamů: 1  

High-Strength Ultra-Fine-Grained Hypereutectic Al-Si-Fe-X (X = Cr,Mn) Alloys Prepared by Short-Term Mechanical Alloying and Spark Plasma Sintering

  1. 1.
    0472590 - ÚFP 2017 RIV CH eng J - Článek v odborném periodiku
    Průša, F. - Bláhová, M. - Vojtěch, D. - Kučera, V. - Bernatiková, A. - Kubatík, Tomáš František - Michalcová, A.
    High-Strength Ultra-Fine-Grained Hypereutectic Al-Si-Fe-X (X = Cr,Mn) Alloys Prepared by Short-Term Mechanical Alloying and Spark Plasma Sintering.
    Materials. Roč. 9, č. 12 (2016), č. článku 973. E-ISSN 1996-1944
    Institucionální podpora: RVO:61389021
    Klíčová slova: mechanical alloying * spark plasma sintering * microstructure * mechanical properties
    Kód oboru RIV: JK - Koroze a povrchové úpravy materiálů
    Impakt faktor: 2.654, rok: 2016
    http://www.mdpi.com/1996-1944/9/12/973

    In this work, Al-20Si-10Fe-6Cr and Al-20Si-10Fe-6Mn (wt %) alloys were prepared by a combination of short-term mechanical alloying and spark plasma sintering. The microstructure was composed of homogeneously dispersed intermetallic particles forming composite-like structures. X-ray diffraction analysis and TEM+ EDS analysis determined that the alpha-Al alongwith alpha-Al-15(Fe,Cr)(3)Si-2 or alpha-Al-15(Fe,Mn)(3)Si-2 phases were present, with dimensions below 130 nm. The highest hardness of 380 +/- 7 HV5 was observed for the Al-20Si-10Fe-6Mn alloy, exceeding the hardness of the reference as-cast Al-12Si-1Cu-1 Mg-1Ni alloy (121 +/- 2 HV5) by nearly a factor of three. Both of the prepared alloys showed exceptional thermal stability with the hardness remaining almost the same even after 100 h of annealing at 400 degrees C. Additionally, the compressive strengths of the Al-20Si-10Fe-6Cr and Al-20Si-10Fe-6Mn alloys reached 869 MPa and 887 MPa, respectively, and had virtually the same values of 870 MPa and 865 MPa, respectively, even after 100 h of annealing. More importantly, the alloys showed an increase in ductility at 400 degrees C, reaching several tens of percent. Thus, both of the investigated alloys showed better mechanical properties, including superior hardness, compressive strength and thermal stability, as compared to the reference Al-10Si-1Cu-1Mg-1Ni alloy, which softened remarkably, reducing its hardness by almost 50% to 63 +/- 8 HV5.
    Trvalý link: http://hdl.handle.net/11104/0269857

     
     
Počet záznamů: 1  

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