COST 507 - Repositório Aberto da Universidade do Porto

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Introduction The project of our unit concerns the study of "Thermodynamic and phase equilibria in the system Al-Mg-Cu-Zn-R-(Ni, Mn) with R= rare earth. (Effect of rare earth additions to Al-based or Mg-based alloys)". In connection with the experimental activity (thermochemistry and phase diagram determination) carried out and reported in group A, our unit is also involved in the calculation (and "prediction") of phase equilibria of selected rare earth alloy systems. Mg-based and Al-based alloys have been especially considered. In the following a short summary is reported of the results obtained in a number of studies on Mg and Al alloys. Magnesium Alloys [96Fla] On the basis of the results of a critical assessment, selected regions of the Ce- Mg-Y system has been investigated employing X-ray diffractometry, optical microscopy and microprobe analyses. Phase relations have been determined in the complete isothermal section at 500°C revealing the existence of two novel ternary compounds: CexYi. x Mg 5 .v (0.39
[96Sei] Excess Gibbs energy coefficients for the binary systems, Mn-Y, Mn-Zr and Y-Zr have been optimised using a least squares method applied to all of the experimental data in the literature plus additional data from new experiments. Combining these with the COST 507 data-sets for Mg-Mn and Mg-Zr plus the Mg-Y data-set from Kuang has enabled extrapolated phases diagrams to be computed for the ternary systems Mg-Mn-Y, Mg-Mn-Zr, Mg-Y-Zr and Mn-Y-Zr. Selected experiments carried out on three of these ternaries show good agreement with the calculated boundaries. On this basis a thermodynamic data-se for the Mg-Mn-Y-Zr system has been assembled which enables several different types of phase diagrams and sections to be computed for the quaternary system. As examples of the kind of diagrams of practical importance that can currently be obtained with modern thermodynamic software for multicomponent alloy systems, calculated phase fraction versus temperature diagrams have been presented for two quaternary alloy compositions, Mg-lwt% Mn-lwt% Zr with 5 and 10 wt% Y respectively. The data presented result from the cooperative network "MSIT Trainer Network on the Constitution of Engineering Materials", operating under EU Human capital and Mobility Programme, TMR. Aluminum Alloys [96Bor] To complete the investigation and the thermodynamic optimization of the Al alloys with trivalent R, the study of La-Al system is now in progress. The examination of the Yb-Al alloys has also been started. This system is different from those given by the trivalent Rs: only two compounds are formed. Even if in both cases the minimum in the trends of Af orm H° versus composition corresponds to the RAJ2 stoichiometry, the different reactivity of Al with La and Yb is also reflected by the disparity between the values of the Af orm H°: -50.512 kJ/mol at. for LaAl 2 and -39.512 kJ/mol at. for YbAl 2 . These results are discussed and compared with those of other similar R-Al compounds. An assessed version of different R-Al systems has been presented. [96Sac2] As a contribution to the understanding of the R-Al diagrams, an assessed version of the Gd-Al system has been prepared and discussed. As a consequence the experimental investigation of the Gd-rich part of the Gd-Al diagram has been carried out. The coordinates of the Gd-rich eutectic, the lowering of the allotropie transformation temperature of the gadolinium by additions of Al and the melting behaviours of the Gdrich compounds have been particularly discussed. 157 -
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European Commission COST European c
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European Commission COST European c
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Preface The Final Workshop of the C
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COST 507 STRUCTURE Measurement and
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GRl: Mirtee S.A., Volos Mr.P.Polati
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D9 Dll Fl GR2 II NI S3 SF1 "Thermop
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A Summary of the COST 507 Action an
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Aluminium-based systems Titanium-ba
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An Example using the COST 507 Datab
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Appendix COST 507: Some Key Meeting
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Al - 0.5 Fe, 1 Mg, 0.8 Mn, 0.2 Si (
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Fig 4 Aluminium beverage cans. The
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Fig 6 High pressure compressor vane
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INTRODUCTION All of us are aware of
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In the interaction with materials a
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There was a first warning more than
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Some time ago, the well-known physi
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Today there is a whole range of ins
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The dimension of this reservoir inc
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REFERENCES [ 1 ] G. Petzow, "Man, M
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Trends in Application of Materials
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Raw Materials The Cycle of Material
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i LÌ i.'»Af·· iù^ VV.V.X. iTTa
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1600 OJ 1200 .« 1100 d 1000 900 Si
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Al Phase Relations in the Aluminium
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oundaries of the single phase regio
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Table 1 : Crystallographic Data of
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order to facilitate the evaluation
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(especially around 33 at% Mg) in or
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3.System Ti-Sn-Al-N. The investigat
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6) N.Durlu, U.Gruber, M.Pietzka, H.
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Summary of final report Directional
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calculate the thermodynamic mixing
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Introduction It is the aim of this
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Thermodynamic evaluations for high
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Figure 5 presents the calculated li
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There is a complete lack in the lit
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a.B5 ø.ia 0.15 0.20 0.25 0.30 0.35
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700 [53Phi] 800 +[90Kuz21 ]iquld a
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Thermodynamic Assessments, Experime
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AIN and TiNi_ x is also given. Vari
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satisfied the three requirements of
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84Bey R. Beyers, R. Sinclair, and M
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Material and Methods 2.1 Fabricatio
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3.4 Electronmicroscopy (SEM) and X-
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Tab. 3: Density of the Ti20Albase
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Tab.5. continued TÌ20A1 5CulONi Ti
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Fig. 3: ESMA and Xray diffraction
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Fig.7: Wetting angle of Ti 15A1 lOC
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Thermophysical Properties of Light
Page 109 and 110: Tab.2 Chemical composition of terna
Page 111 and 112: 700 (AI)+AIFeS¡«_600 KS1275.1 l
Page 113 and 114: 4.2 Thermal conductivity of industr
Page 115 and 116: 4.3 AlSiZn alloys Electrical re
Page 117 and 118: 94Jar/Bra G.Jaroma-Weiland, R.Brand
Page 119 and 120: MgZn9 (C 14) and Mg2Zn u in the Al
Page 121 and 122: The three Laves phases were describ
Page 123 and 124: References [13Ege] G. Eger, Z. Meta
Page 125 and 126: 0.30 0.35 0.40 0.45 0.50 mole fract
Page 127 and 128: □ [48Koe] 600 500 400 0 0.1 0
Page 129 and 130: MggZn,, this work □ Single phase,
Page 131 and 132: Temperatures in °C 0.05 0.10 mole
Page 133 and 134: Table 2 : Alloy compositions Alloy
Page 135 and 136: All. Dy 50 Cpexp °C Cpadd Table 5
Page 137 and 138: Zn ¿Kl Si Fig. 2 : Position of the
Page 139 and 140: 22.5 ■■ 7.5 Temperature ICI Tem
Page 141 and 142: .to 2.5 "lõõ soo iÍOõ dOõ rtõ
Page 143 and 144: GR2 Differential Scanning Calorimet
Page 145 and 146: Time (x10 3 sec) Fig. 1. DSC Thermo
Page 147 and 148: solidification. It can be seen that
Page 149 and 150: 4. Conclusions Differential scannin
Page 151 and 152: COST 507 - ROUND Π UNIT II SEZIONE
Page 153 and 154: [96Sac] The Rrich regions of the
Page 155 and 156: List of publications in the framewo
Page 157 and 158: 2Contributions: oral or posters p
Page 159: 1996 REPORT 2 s ' PART: ACTIVITY CA
Page 163 and 164: List of publications in the framewo
Page 165 and 166: Proc. :7 th Meeting on "Syntheses a
Page 167 and 168: 2.1 Solid solubility measurements T
Page 169 and 170: eviews by Rivlin and Raynor [81 Riv
Page 171 and 172: inaires. Thesis, Universite Scienti
Page 173 and 174: Table 1. Review of the ternary phas
Page 175 and 176: L) Liq+bcc=FeSi+t_1 M) Liq+t 1=FeSi
Page 177 and 178: Extrapolations based on Ti-C-N S3 B
Page 179 and 180: value has been accepted in all thre
Page 181 and 182: with high precision whereas Jonsson
Page 183 and 184: only fit the hightemperature asym
Page 185 and 186: Jonsson combined his descriptions o
Page 187 and 188: Table II. Solubility product of TiC
Page 189 and 190: Ti-C, Z.Metallkd. 86 (1995) 5 319
Page 191 and 192: 1000 1500 2000 2500 3000 Τ (K) Fig
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Page 195 and 196: M^øD^ O Kelley(1944) • Kelley an
Page 197 and 198: — cale, with Dumitrescu (1997) -
Page 199 and 200: € gfc-π m-, .-π-, π-π .-saa J
Page 201 and 202: +graph 0 TiN 0.2 0.4 0.6 X TiC 0.8
Page 203 and 204: Binder et al (1992) TiN 1423 K ■
Page 205 and 206: 0.08 600°C 700°C 800°C 900°C 10
Page 207 and 208: [59Sto]: Ä600°C □ 70D°C O8Q0°
Page 209 and 210: 2000 Cale, with Saunders (1997) —
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An Experimental Investigation of th
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An Experimental Investigation of th
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EXPERIMENTAL INVESTIGATION OF THE C
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Fig.1 SEM micrographs of CuMgZr
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■ 888 24 HSM^«" 16—19 3 À I
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Thermodynamic Evaluations of the Al
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Fcc_Al aves_C15 ONU ΔΝ12 αΝ13
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2.2 Assessment The optimisation of
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0.50 0.45 CulOZr7/ 0. 40 Or ^ 0.3
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References [71Kri] Kripyakevich, P.
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Kejun Zeng and Marko Hämäläinen,
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for detennining phase boundary and
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Table 2 Al-Fe-Mn results wt%Fe 0.5
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•00 Γ Ι I I I ~ LIQUID S^ 7iO
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the observed A2-B2 ordering. This p
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1473K Ahmed & Flower [94 Ahmi] 0.2
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900K Paruchuri & Massalski [91Par]
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BCC_B2#2 TI3RL TIPL BCC B2#2 TIRL
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0.2 0.3 0.4 0.5 X(LIQ,V) Figure 15
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1 Introduction and Overview of the
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at least 95% by Fe, possibly 99%, a
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8 References 43Phi H W L Phillips,
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1050 1000 Isopleth, Al - Si - 4 wt
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Al-Mn-Si 873 K 0.90 Liquid 0.80 0.7
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A Thermochemical Assessment of Data
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certainly due to the appearance of
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Materials Science Centre, November
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1400 Al-Mn Fig 2 Calculated partial
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1000 ι AlMn I Ι 950 Liquid E ω
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Al-Fe-Mn 843 K 0.90 0.80 0.70 0.60
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AlFeMn section at 2 wt% Mn co
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0.50 0.45 0.40-1 LU £ 0.35 LU 0.30
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European Commission EUR 18171 —CO
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NOTICE TO THE READER Information on
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COST 507 - Repositório Aberto da Universidade do Porto

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