ACTA TECHNICA CORVINIENSIS - Bulletin of Engineering

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ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERINGand the operation of the PT must be consideredon load composition of the alloy development.As before, the highest is Si content (but Si>>0). The second hardening regime isrecommended for large size PT with thermalnode (joints massifs).acdFig.2 ATSi 9 Cu 3 MgMnB alloy structure: a- cast (100:1);b- cast (500:1); over TT; c- 100:1; d- 500:1b542010/Fascicule 2/AprilJune /Tome III
ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERINGof the alloy as ATSi 10 MgMn. The cutting processis better [5], than the two mentioned alloys. Thewelding is good.To confirm the correctness of the choice ofaging regime is shown in figure 6 (2.83) s.s.αalloy structure ATSi9Cu3MgMnB in hardeningstate and cast in forms of mixture formation.Fig.3 Type of crystallization phaseW(Al x Mg 5 Cu 4 Si 4 ) la 500:1aFig.4 Direct thermal analysis curves (1) anddifferential (2) of the ATSi 9 Cu 3 MgBTibFig. 6 ATSi 9 Cu 3 MgMnB structure alloy in hardeningstate after casting in: a- FAT and b- shell (10000:1)Fig.5 ATSi 9 Cu 3 MgMnB proprieties determined onsample of Φ12mm cast in shellMechanical properties of ATSi 9 Cu 3 MgMnBhardening after the first regime and the agingafter the regime 165°C/22h or 175°C/7h, with aircooling are shown in figure 5 (2.82). At 20°C hasHB=120daN/mm 2 and decrease with testtemperature increase.CONCLUSIONSThe physical properties of the alloyATSi 9 Cu 3 MgMnB practically are the same asthose of the alloy ATSi 9 Cu 2 MgB, and the castingNote that the cooling was the first stage of aging,this mean that, they have managed to form ZGPand agglomerations of Si ultra-dispersedparticles what were separately from s.s.α. Incomparing these pictures, you can see that ZGPdensity in solid solution alloy ATSi 9 Cu 3 MgMnB,cast in FT, is much reduced, comparative to s.s.αof the alloy cast in shell. This can be explainedby the fact that: supersaturate degree of s.s.α inthe last sample, in all probability, is higher, andthe degree of distortion R cr of s.s.α also higher,which accelerates the process of form ZGP, andultra-dispersed particle of elementary Si.REFERENCES[1] SPOREA ION, Bordeaşu Ilare, Mandek Francisc,Aliaje de aluminiu refractare turnate în pistoanede motoare termice, Ed. Politehnica,Timişoara,ISBN 2008[2] TOKAR ADRIANA, SPOREA, ION, ş.a Influence of heattreatment on the alpha coeficient, the pistonczlinderclearance with Dacia engines, Scientific2010/Fascicule 2/AprilJune /Tome III 55
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ACTA TECHNICA CORVINIENSIS - Bulletin of Engineering

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