COST 507 - Repositório Aberto da Universidade do Porto

More documents

Recommendations

Info

2.6 Ti-Al-V system A preliminary assessment of various modeling approaches to the TiAlV system has been performed in close cooperation with the University of Manchester/UMIST. The focused work on that alloy system is now carried out by that COST partner. This agreement has also strengthened our focused work on the Ncontaining ternary edge systems of the quaternary TiAlVN system. 2.7 Ti-Ni-N system The TiNiN phase diagram has been thermodynamically assessed. The liquid and the recently found ternary compound Ti 2 NiN x by [95Fri] have been modeled. It is found that the discrepancies of the experimental data between [9 IB in] and [79Fuk] are due to the different experimental conditions. They are essentially in good agreement. A number of missing key experiments are identified by the preliminary calculations. These experiments have been performed in close cooperation by the Universität Wien. This work is close to completion, and the publications are in preparation. 2.8 Ti-Al-Ni system A thermodynamic assessment of the Nirich part of the TiAlNi system has recently been provided by our COST partner, the LTPCM-ENSEEG , Grenoble [95Dup]. The purpose of our work is to use this as a basis for the development of a thermodynamic dataset for the entire composition range. Experimental data on the TiNiAl system have been thermodynamically evaluated to plan new key experiments in order to obtain reliable data for optimization of the system in the composition region less than 50 at.% Ni. Part of the experimental work was carried out at our COST partner Universität Wien. Further experimental work is being carried out currently at TU Clausthal. All the experimental work is done in close cooperation with our partner at the Universität Wien, involving also the exchange of a graduate student for 3 months. The purposes are mainly to check the tielines Ti 3 AlH(TiNi 2 Al) and λ(ΤίΝίΑΙ)- Ti 2 Ni, and determine the phase relationships of the π(Τί 5 Νί 2 Α1| 3 ) phase and its stability. These key data will allow for a final thermodynamic modeling of the entire ternary system. Work is in progress and will be published in due course by the end of our project. 3. Applications 3.1 Ti-Al-N system 3.1.1 AIN/Ti interface reaction: Joining of A1N with Ti-braze [97Zenl] Since A1N and Ti are not in equilibrium at high temperatures, interfacial reactions will occur when A1N is joined by titanium braze. Fig. 11 in Appendix III shows the calculated isothermal section of the Ti-Al-N system at 1200°C and the imposed reaction path of the AIN/Ti contact system in accordance with [95E1S]. This path has 86 -
satisfied the three requirements of an interfacial diffusion path. In the beginning of reaction, A1N is decomposed and the nitrogen atoms are released to react with Ti to form nitride TiN.. x between A1N and Ti layers. The TiN,. x layer serves as a trap for nitrogen between A1N and Ti because nitrogen has a rather high solubility in it. Hence, the formed (aTi) phase between TiN.. x and (ßTi) must be nitrogendepleted. Consequently, other diffusion paths which start from the Ti terminal but first go to the nitrogenenriched a(Ti,N) phase, such as βΤί/α(Τί,Ν)/τ./γ/τ 2 /δ/Α1Ν, are impossible. 3.1.2 TiN/AI interface reaction TiN as diffusion barrier between Al/Si [96Zen2] ΤίΝ,.χ has been widely investigated as diffusion barrier between Al and Si. The Al/TiN/Si system has been shown to be stable at temperatures between 500 and 600°C for around 30 min., but fail at longer annealing times. It has been suggested that the barrier failure be initiated at the Al/TiNi_ x interface [82Wit]. The thermodynamic description of the Ti-Al-N system in [97Zenl] has been used to establish overall phase relationships of the Ti-Al-N system at 600°C and, then, in conjunction with diffusion kinetics, provide a theoretical interpretation of experimental results on the interfacial reaction between Al and TiN|. x films. It is suggested that the observed stable TiAl 3 /TiN contact at 600 °C was in metastable state due to extremely rapid growth of TiAl 3 , and hence the three-phase equilibrium TiN-AlN-TiAl 3 proposed by [84Bey] is not a stable equilibrium. Sintering of Al+TiNpowder mixture [97Zenl] A promising Al-matrix composite, which is hardened by intermetallic compounds TiAl 3 and A1N, have been synthesized from powder mixture of Al+TiN by means of reaction sintering within temperature range of 550~650°C [92Koy]. From the experimental results, it seems that there exists interdiffusion of Al and Ti but the nitrogen atoms do not diffuse, and the reaction path is Al/TiAl 3 /AlN/TiN. This is similar to the interfacial reaction between thin films Al and TiN mentioned above. Therefore the thermodynamic description of the Ti-Al-N system in [97Zenl] can also be applied to this case. 3.1.3 Metastable AIN-TiN films [97Zenl] Discussion has been given on the thermodynamic description of the metastable solutions in AIN-TiN thin films. It was concluded that fcc-(AI) and fcc-TiN x should not be treated as the same phase. Using the current datasets a calculation of the Gibbs energy surface of δ-(Τί,Α1)Νι. χ in the ternary system is possible. This provides also data for the decomposition of N-deficient metastable films. 3.1.4 Nitridation of Ti-Al alloys [97Sch] 87
Page 1 and 2:
European Commission COST European c
Page 5 and 6:
European Commission COST European c
Page 7:
Preface The Final Workshop of the C
Page 11 and 12:
COST 507 STRUCTURE Measurement and
Page 13:
GRl: Mirtee S.A., Volos Mr.P.Polati
Page 16 and 17:
D9 Dll Fl GR2 II NI S3 SF1 "Thermop
Page 19 and 20:
A Summary of the COST 507 Action an
Page 21 and 22:
Aluminium-based systems Titanium-ba
Page 23 and 24:
An Example using the COST 507 Datab
Page 25 and 26:
Appendix COST 507: Some Key Meeting
Page 27 and 28:
Al - 0.5 Fe, 1 Mg, 0.8 Mn, 0.2 Si (
Page 29 and 30:
Fig 4 Aluminium beverage cans. The
Page 31:
Fig 6 High pressure compressor vane
Page 34 and 35:
INTRODUCTION All of us are aware of
Page 36 and 37:
In the interaction with materials a
Page 38 and 39:
There was a first warning more than
Page 40 and 41: Some time ago, the well-known physi
Page 42 and 43: Today there is a whole range of ins
Page 44 and 45: The dimension of this reservoir inc
Page 46 and 47: REFERENCES [ 1 ] G. Petzow, "Man, M
Page 48 and 49: Trends in Application of Materials
Page 50 and 51: Raw Materials The Cycle of Material
Page 52 and 53: i LÌ i.'»Af·· iù^ VV.V.X. iTTa
Page 54 and 55: 1600 OJ 1200 .« 1100 d 1000 900 Si
Page 57 and 58: Al Phase Relations in the Aluminium
Page 59 and 60: oundaries of the single phase regio
Page 61 and 62: Table 1 : Crystallographic Data of
Page 63 and 64: order to facilitate the evaluation
Page 65 and 66: (especially around 33 at% Mg) in or
Page 67 and 68: 3.System Ti-Sn-Al-N. The investigat
Page 69 and 70: 6) N.Durlu, U.Gruber, M.Pietzka, H.
Page 71 and 72: Summary of final report Directional
Page 73 and 74: calculate the thermodynamic mixing
Page 75 and 76: Introduction It is the aim of this
Page 77 and 78: Thermodynamic evaluations for high
Page 79 and 80: Figure 5 presents the calculated li
Page 81 and 82: There is a complete lack in the lit
Page 83 and 84: a.B5 ø.ia 0.15 0.20 0.25 0.30 0.35
Page 85 and 86: 700 [53Phi] 800 +[90Kuz21 ]iquld a
Page 87 and 88: Thermodynamic Assessments, Experime
Page 89: AIN and TiNi_ x is also given. Vari
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 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 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
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
Page 193 and 194:
o Oí o 3 4 5 6 7
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) —
Page 211 and 212:
An Experimental Investigation of th
Page 213 and 214:
An Experimental Investigation of th
Page 215 and 216:
211 -
Page 217 and 218:
EXPERIMENTAL INVESTIGATION OF THE C
Page 219 and 220:
Fig.1 SEM micrographs of CuMgZr
Page 221 and 222:
■ 888 24 HSM^«" 16—19 3 À I
Page 223 and 224:
Thermodynamic Evaluations of the Al
Page 225 and 226:
Fcc_Al aves_C15 ONU ΔΝ12 αΝ13
Page 227 and 228:
2.2 Assessment The optimisation of
Page 229 and 230:
0.50 0.45 CulOZr7/ 0. 40 Or ^ 0.3
Page 231 and 232:
References [71Kri] Kripyakevich, P.
Page 233 and 234:
Kejun Zeng and Marko Hämäläinen,
Page 235 and 236:
for detennining phase boundary and
Page 237 and 238:
Table 2 Al-Fe-Mn results wt%Fe 0.5
Page 239 and 240:
•00 Γ Ι I I I ~ LIQUID S^ 7iO
Page 241 and 242:
the observed A2-B2 ordering. This p
Page 243 and 244:
1473K Ahmed & Flower [94 Ahmi] 0.2
Page 245 and 246:
900K Paruchuri & Massalski [91Par]
Page 247 and 248:
BCC_B2#2 TI3RL TIPL BCC B2#2 TIRL
Page 249 and 250:
0.2 0.3 0.4 0.5 X(LIQ,V) Figure 15
Page 251 and 252:
1 Introduction and Overview of the
Page 253 and 254:
at least 95% by Fe, possibly 99%, a
Page 255 and 256:
8 References 43Phi H W L Phillips,
Page 257 and 258:
1050 1000 Isopleth, Al - Si - 4 wt
Page 259 and 260:
Al-Mn-Si 873 K 0.90 Liquid 0.80 0.7
Page 261 and 262:
A Thermochemical Assessment of Data
Page 263 and 264:
certainly due to the appearance of
Page 265 and 266:
Materials Science Centre, November
Page 267 and 268:
1400 Al-Mn Fig 2 Calculated partial
Page 269 and 270:
1000 ι AlMn I Ι 950 Liquid E ω
Page 271 and 272:
Al-Fe-Mn 843 K 0.90 0.80 0.70 0.60
Page 273 and 274:
AlFeMn section at 2 wt% Mn co
Page 275:
0.50 0.45 0.40-1 LU £ 0.35 LU 0.30
Page 279:
European Commission EUR 18171 —CO
Page 284:
NOTICE TO THE READER Information on
show all

COST 507 - Repositório Aberto da Universidade do Porto

Create successful ePaper yourself

Delete template?

Save as template?