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Search Results: 1 - 10 of 319816 matches for " K.N. Braszczyńska-Malik "
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Microstructure of as-cast experimental binary Mg-RE alloys
K.N. Braszczyńska-Malik
Archives of Foundry Engineering , 2008,
Abstract: Microstructure anaIyscs of as-cast cxpcrirncntal Mg-3%RE and Mg-8%RE alloys were cmicd out. tight microscopy and scanningelectron microscopy (SEM+EDX) tschniqucs wcrc uscd to charactcrizc investigated materials Rcsults show thar thc as-cast dcndriticmicrosEructurc is charactcrizcd by lamcllar cutcctic of primary u phase and intcrdcndritic phasc. X-ray phasc analyses allowed theidentiticaklon of thc nrc canh clcmcnrs-rich intcrmctallic compound in thc alloys as he~ngM glzRE.
Non-standard heat treatment of cast AZ91 magnesium alloy
K.N. Braszczyńska-Malik,J. Kamieniak
Archives of Foundry Engineering , 2008,
Abstract: Rcsutts of microsrrucrurc and rncchanicnl propertics invcs~igations of M9I magncsium alloy =-cast and after hcnt rrcntmcnt arcprcscntcd. Cylindcr samplcs lor ~iniwiallyc omprcssion tcsts wcrc anncalcd at a tcmpcraturc of 423 and 623 K for I6 hours (withoutsoln!ion anncnling). Altcr anncnting at 423 K prccipitatcs of pMg17hE1p2h asc in mas cnrichcd in aluminum solid solurion wcrc obscrvcdwhercas mncaling at 623 K cnuscd only hornogcnizing af solid solution. lnvcsligatcd materials showcd insignificant changes in ultimatecomprcssion strcngth and clcarly incrcasc valuc of ylcld streng~ho f samples anncalcd at 623 K.
Influence of solidification rate on microstructure of gravity cast AZ91 magnesium alloy
K.N. Braszczyńska-Malik,A. Zyska
Archives of Foundry Engineering , 2010,
Abstract: Derivative thermal (ATD) and microstructure analyses of gravity cast AZ91 magnesium alloy are presented. The alloy was cast into cold steel and sand moulds with the same dimensions. ATD curves – solidification curves and their first derivative – are presented. The investigated alloy exhibited a strong alloying elements segregation and the presence of solid solution and (Mg17Al12) eutectic mixture. Discontinuous precipitates of phase were also observed in the microstructure of AZ91 cast into sand mould.
Microstructure of as-cast Mg-Y-RE-Zr magnesium alloy
K.N. Braszczyńska-Malik,A. ?ydek
Archives of Foundry Engineering , 2008,
Abstract: Microstructure analyscs of as-cast Mg - 4.0 wt.8 Y - 3.3 wt.% RE - 0.5 wt.9 Zr alloy werc camcd out. Light microscopy andscanning clcct ron microscopy (SEM+EDX) tcchniqucs wcrc us4 lo chnmcterizc lthc invcstigatcd material. Rcsults show that the =-castdcndritic micmsrructurc is characrcritcd hy lamcltar cutoctic aC primary u phase and intcrdcndritic phasc Mg-Nd-Y tw. Additionally,"quadratic" ytrrium-rich prccipitatcs wcrc rcvealcd.
Microstructure of Mg-A1 alloy with rare earth elements
K.N. Braszczyńska-Malik,A. ?ydek
Archives of Foundry Engineering , 2008,
Abstract: The rnicrostmcture analyses of experimental A291 rnagncsium al toy with addition of I "5 wt.8 of rnrc cart11 clcmcnts was prcscntcd.The invcstigatcd AZ9 1 + 1.5'XcRE alloy was fabricated by addition of rcriurn rich misch mctnl to rnoIt.cn commcrcial AZ9 1 alloy andgraviry cast. As a rcsult. a solid solution, a+y binary cutcctic, discontinuous prccipitarcs of y phasc, All lMn3 pbasc wit11 nccdlc-likemorphology. A12RE and Al l,,RE2Mn7 particutarc phases werc rcvcald.
Microstructural Characterization of the As-cast AZ91 Magnesium Alloy with Rare Earth Elements
A. Grzybowska,K.N. Braszczyńska-Malik
Archives of Foundry Engineering , 2012,
Abstract: Microstructural analysis of as-cast Mg-9Al-0.9Zn-xRE (x = 0, 1, 2, 3, 5 wt.%) magnesium alloys is presented. Light microscopy (LM) andscanning electron microscopy (SEM+EDX) were used to characterized the obtained material. The results revealed that the as-cast AZ91alloy consists of α – Mg matrix, binary eutectic + (where is Mg17Al12). While rare earth elements were introduced to the Mg-Al-Znalloy new Al11RE3 phase was formed. Additionally, in the experimental alloys instead of Al-Mn phase, ternary Al-Mn-RE compound was observed. What is more, the influence of RE addition on the area fraction of eutectic and needle-like phase was analysed. With increasing addition of RE, the amount of γ phase decreased, but the amount of Al11RE3 phase increased.
The new foundry line for magnesium alloys high-pressure die-casting
K.N Braszczyńska-Malik,W Walczak,J Braszczyński
Archives of Foundry Engineering , 2008,
Abstract: The new foundry line for high-pressure die-casting of magnesium alloys constructed in the “SILUM” Foundry (Opojowice, Poland) is described. In the process cold chamber die-casting machines are used. The experimental casts and the radiators fabricated using the new cold chamber die-casting line are presented as the final results. The new production line allows to obtain good quality magnesium casts.
Mechanical properties of high-pressure die-casting AZ91 magnesium alloy
K.N. Braszczyńska-Malik,I. Zawadzki,W. Walczak,J. Braszczyński
Archives of Foundry Engineering , 2008,
Abstract: Results of mechanical properties of high-pressure die-casting AZ91 magnesium alloy are presented. Performed examinations allowed to determine influence of plunger velocity in the first and second stage and intensification pressure on the ultimate tensile strength (UTS), yield strength (YS), elongation (A5 and Agt), Brinell hardness (HB) and impact strength (IS) of samples cast on 320 tone cold chamber machine. Obtained results revealed the highest properties at median used parameters and also the most powerful effect of plunger velocity in the first stage. The maximum values of mechanical properties obtained from the performed experiments were: UTS 250 MPa, YS 160 MPa, A5 7%, 70 HB, IS 7 J.
Microstructural Analysis of AM50/Mg2Si Cast Magnesium Composites
M.A. Malik,K. Majchrzak,K.N. Braszczyńska-Malik
Archives of Foundry Engineering , 2012,
Abstract: AM50/Mg2Si composites containing 5.7 wt. % and 9.9 wt. %. of Mg2Si reinforcing phase were prepared successfully by casting method.The microstructure of the cast AM50/Mg2Si magnesium matrix composites was investigated by light microscopy and X-ray diffractometry (XRD). The microstructure of these composites was characterized by the presence of α-phase (a solid solution of aluminium in magnesium), Mg17Al12 (γ-phase), Al8Mn5 and Mg2Si. It was demonstrated that the Mg2Si phase was formed mainly as primary dendrites and eutectic.
Microstructural Characterization of Cast Magnesium Matrix Composites by Raman Microscopy
M.A. Malik,K.N. Braszczyńska-Malik,K. Majchrzak
Archives of Foundry Engineering , 2013,
Abstract: Cast magnesium matrix composites reinforced with silicon carbide particles were investigated by using Raman microscopy. 3C, 4H and6H polytypes of SiC particles were identified in the investigated composites. Additionally, Mg2Si compound was detected by Ramanmicroscopy in the composites microstructure.
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