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2 µm - eTheses Repository - University of Birmingham

2 µm - eTheses Repository - University of Birmingham

appropriate specimen

appropriate specimen preparation methods or the poor mechanical properties in tensile loading. The experimental strength testing methods of the different research groups were derived from their main research materials. In general, groups concentrating on ceramics rely on ceramic material testing methods. Therefore for strength testing, bending tests were conducted as shown in Table 2.1 by Long et al. (49,50) Prielipp et al. (52) and Beyer (53) . In contrast groups concentrating on reinforcement of light metal alloys (e.g. aluminium castings) tested the material in pure tension, as presented by Kniewallner (51) . 19

20 Table 2.1 Compilation of the mechanical properties of preform MMCs from different research groups. (Refs - see table) Long, S. et al. 1999 Kniewallner, L. 1992 Matrix alloy Reinforcement ceramics / shape 20 Volume Fraction Infiltration E YTS UTS A5 Test KIC route method GPa MPa MPa % MPa m -1/2 ISQC 120 - 899 - DSQC 120 - 891 - 0.15 ISQC 96 - 523 - 0.15 DSQC 95 - 514 - AlCu4MgAg T6 SiC F500 (p) 0.53 DSQC 160 - 346 - 5,4 AlSi9Cu3 0 75 132 227 1,8 0.135 80 114 235 1,6 0.20 90 98 280 1,4 0 75 85 190 7,5 0.135 ISQC 80 75 190 2,5 0.20 85 85 220 1,6 0 68 168 225 1,5 0.125 82 141 290 1,6 0.20 95 130 295 1 Prielipp, H. et al. Al Lig. 0.08 µm - - 630 2,9 1995 Al Lig. 0.25 µm Al2O3(p) 0.75 GPI - - 710 n.a. 4PB 5,4 Beyer, P. 2002 Al 99.5 AlCu4MgAg T6 AlSi12 AlMg9 Al Lig. 0.8 µm - - 510 7,4 Al Al 2O 3 (lf) Altex Al 2O 3 (cf) Saffil Al 2O 3 (cf) Saffil 50 % TiO 2 (p) + 50 % Al 2O 3 (p) 0.50 0.54 GPI - - 642 n.a. 4PB 8,7 (53) Abbrevations: Alloy T6: precipitation hardened (peak hardened) Reinforcement ceramics (p): particles; (lf): continious fibres; (cf): chopped fibres Infiltration route GPI: Gas pressure infiltration; ISQC: Indirect Squeeze Casting; DSQC: Direct Squeeze Casting YTS Yield tensile strength UTS Ultimate tensile strength A5 Elongation to fracture Test method 3PB (4PB): 3-(4-) point bending test Al Lig. Aluminium ligament size 3PB Tensile test n.a. n.a. Ref. (49, 50) (51) (52)

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