COST 507 - Repositório Aberto da Universidade do Porto

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3. Results 3.1. Industrial Al-Si based alloys Table 4 summarises the results of Cp-determinations on alloys KS-4 and KS-5 as well as their repeatability (the maximum Öeviation is ± 0.2 %). Originally four temperatures were selected : 50, 150, 250 and 450 °C; at the latter, the alloy had been kept for an hour before the actual measurements, but results had to be discarded, as they did not give a unique value on heating and on cooling. Also indicated are the Cp-results of Jaroma-Weiland [96Jar] on the same alloys, with extrapolations to 50 °C. She used sapphire as reference material in conjunction with the normal continuous 3step procedure. The reproducibility of the two independent determinations, i.e. the deviation of the mean values of the results of an instrument from the total mean value [96 Höh] lies within ± 1.5 %. The agreement is very good, as Jaroma-Weiland et al. evaluate the inaccuracy (band) of their measurements to lie below 3 % [94Jarl. The present Cp-data may be connected linearly between 50 and 250 °C. The higher Si content of KS-5 is responsible for lower Cp-values. Tal ble 4 : Cp inJ/gK KS-4 50 °C 150 °C 250 °C Present study repeatability ± 0.879 0.2 % 0.928 0.1 % 0.9715 0.1 % Jaroma-Weiland reproducibility ± 0.889 1.1 % 0.928 -0% 0.985 1.4% KS-5 Present study 0.852 repeatability ± 0.1 % Jaroma-Weiland 0.865 reproducibility ± 1.5 % 0.900 0.2 % 0.901 0.2 % 0.944 0.2 % 0.954 1 % 3.2 Al-Si-Zn alloys Having gained confidence in the adopted measuring technique, the Cp-data on the ternary alloys were determined on heating each specimen three times over the temperature intervals 40 - 60 and 390 - 410^C (340 - 360 °C in the case of alloys 6 and 9). The mean values (Cpexp in J/gK), often obtained on two different specimens, are given in table 5; their reproducibility is estimated to be the same as for the industrial alloys (± 1.5 %). The results are consistent with the compositions of the alloys : increasing Si and especially Zn concentrations decrease the Cp-values. For comparison, the Cpadd-data derived according to the additivity rule are indicated; the values for the pure elements are taken from table 3 [91 Din]. At 50 °C, the calculated values are more important than Cpexp. The alloys 7, 8 and 10 in the Al rich corner possess Cp-values at 400 °C which correspond to additivity within the experimental inaccuracy. - 130
All. Dy 50 Cpexp °C Cpadd Table 5 : Cp in J/gK 350 Cpexp °C Cpadd 400 Cpexp °C Cpadd 1 2 3 6 7 8 Q 10 11 12 13 0.737 0.716 0.706 0.517 0.814 0.797 0.428 0.848 0.607 0.596 0.601 0.808 0.804 0.775 0.600 0.845 0.845 0.453 0.881 0.702 0.700 0.708 0.602 0.530 0.684 0.512 0.891 0.886 0.871 1.003 0.982 1.046 0.751 0.736 0.743 0.946 0.942 0.909 1.000 0.991 1.032 0.819 0.818 0.828 4 Conclusion Specific heat capacities were measured with the help of a PerkinElmer thermal analyser DSC7 series 1020, applying the discontinuous 3step method. The repeatability of the data is of ± 0.2 %. Their reproducibility as derived from a comparison with independent determinations on some alloys is of± 1.5 %. The Cpdata obtained on two technical ΑΙSi based alloys may be connected linearly between 50 and 250 °C. Ternary AlSiZn alloys possess Cpvalues at 50 and 400 °C which lie in general below those corresponding to the NeumannKopp rule. 5 References 87Des Ρ D Desai, Internat J Thermophys, 1987, 8, 621638. 91Din A Τ Dinsdale, Calphad, 1991, 15, 317425. 95Höh G Höhne, W Hemminger, ΗJ Flammersheim, Differential Scanning Calorimetry, Springer, 1995. 96Jar G JaromaWeiland, Progress Report for Period July-December 1995, COST 507 Thermophysical Properties of Light Metal Alloys. University of Stuttgart. 94Jar G JaromaWeiland, R Brandt, G Neuer, Final Report 1994, COST 507 Thermophysical Properties of Light Metal Alloys. University of Stuttgart. 131
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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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Page 85 and 86: 700 [53Phi] 800 +[90Kuz21 ]iquld a
Page 87 and 88: Thermodynamic Assessments, Experime
Page 89 and 90: AIN and TiNi_ x is also given. Vari
Page 91 and 92: satisfied the three requirements of
Page 93 and 94: 84Bey R. Beyers, R. Sinclair, and M
Page 95 and 96: Material and Methods 2.1 Fabricatio
Page 97 and 98: 3.4 Electronmicroscopy (SEM) and X-
Page 99 and 100: Tab. 3: Density of the Ti20Albase
Page 101 and 102: Tab.5. continued TÌ20A1 5CulONi Ti
Page 103 and 104: Fig. 3: ESMA and Xray diffraction
Page 105 and 106: Fig.7: Wetting angle of Ti 15A1 lOC
Page 107 and 108: 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: Table 2 : Alloy compositions Alloy
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 and 160: 1996 REPORT 2 s ' PART: ACTIVITY CA
Page 161 and 162: [96Sei] Excess Gibbs energy coeffic
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
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Jonsson combined his descriptions o
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Table II. Solubility product of TiC
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Ti-C, Z.Metallkd. 86 (1995) 5 319
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1000 1500 2000 2500 3000 Τ (K) Fig
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o Oí o 3 4 5 6 7
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M^øD^ O Kelley(1944) • Kelley an
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— cale, with Dumitrescu (1997) -
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€ gfc-π m-, .-π-, π-π .-saa J
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+graph 0 TiN 0.2 0.4 0.6 X TiC 0.8
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Binder et al (1992) TiN 1423 K ■
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0.08 600°C 700°C 800°C 900°C 10
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[59Sto]: Ä600°C □ 70D°C O8Q0°
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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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211 -
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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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