Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Mechanical and acoustic emission behavior in channel-die compressed Mg9Li alloys before and after treatment by HPT method

nr katalogowy: 52743

The Mg-Li alloys and the composites based on these materials have been still attractive candidates for light and tough construction materials for the application in automobile (e.g. car engine housings), aviation and space industries. The alloys can occur in three different phase areas. The alloys containing up to 4 wt. % Li consist of α phase of hexagonal lattice A3 (hcp), while these with above 12 wt. % Li are in the form of β phase, which is cubic A2 (bcc). The alloys of Li content from 4 up to 12 wt. % are two-phase and occur as the mixture of α+β phases. The mechanical properties of the α phase are worse than these of the β phase, which reveals very good plasticity [1]. The methods of intensive deformation have recently been more frequently applied [2÷4] in order to obtain ultra fine-grained refinement which ensures high strength and plasticity as well as prospects for the superplastic flow of the material in conditions of relatively low temperatures [2]. The AE technique has been still helpful in the examinations of deformation mechanisms, particularly regarding the mentioned materials of ultra fine-grained (nonocrystalline) morphology obtained after processing with intensive strain methods [2, 3, 7, 8]. The aim of the research was to describe and explain the correlations between the proceeding of the generated AE signals and the mechanisms of plastic (or possible superplastic) deformation in the Mg-Li alloys subjected to compression tests in the channel-die before and after the application of HPT technique. EXPERI MENT AL MET HODS The Mg-9Li alloys were produced within the cooperation with the Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovakia. The material was obtained by melting magnesium and lithium of 99.99 and 99.5 % purity, respectively in a Ba[...]

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