TY - JOUR

T1 - Zum Einfluss des Lösungsglühens und Aushärtens auf die Mikrostruktur von ZK40-Legierungen, modifiziert durch Zugaben von Ca, Gd, Nd und Y

AU - Buzolin, Ricardo Henrique

AU - Mendis, Chamini Lakshi

AU - Tolnai, Domonkos

AU - Kainer, Karl Ulrich

AU - Hort, Norbert

AU - Pereira Da Silva, Erenilton

AU - Cavalcanti Pinto, Haroldo

PY - 2018/5

Y1 - 2018/5

N2 - As-cast ZK40 alloys, modified with the addition of CaO, Gd, Nd and Y were investigated. Solution heat treatments were performed based on differential thermal analysis results. The unmodified ZK40 alloy exhibited microstructure with nearly no intermetallic compound but with precipitates formed during the solution treatment. The modified ZK40 alloys exhibited a semi-dissolved network of intermetallic compounds along the grain boundaries and zones of intermetallic compounds within the grains. Interestingly, no precipitates were observed immediately next to the grain boundaries. The energy dispersive X-ray spectroscopy line scans showed an enrichment of Zn and Zr in the regions where the precipitates are found, suggesting that they are Zn-Zr precipitates. The ageing behaviour was compared between the as-cast and the solution treated materials and it was found that apart from the ZK40-Gd, ZK40-Nd and ZK40-Y aged at 200 °C after solution treatment, there is no notable ageing response for the investigated alloys.

AB - As-cast ZK40 alloys, modified with the addition of CaO, Gd, Nd and Y were investigated. Solution heat treatments were performed based on differential thermal analysis results. The unmodified ZK40 alloy exhibited microstructure with nearly no intermetallic compound but with precipitates formed during the solution treatment. The modified ZK40 alloys exhibited a semi-dissolved network of intermetallic compounds along the grain boundaries and zones of intermetallic compounds within the grains. Interestingly, no precipitates were observed immediately next to the grain boundaries. The energy dispersive X-ray spectroscopy line scans showed an enrichment of Zn and Zr in the regions where the precipitates are found, suggesting that they are Zn-Zr precipitates. The ageing behaviour was compared between the as-cast and the solution treated materials and it was found that apart from the ZK40-Gd, ZK40-Nd and ZK40-Y aged at 200 °C after solution treatment, there is no notable ageing response for the investigated alloys.

KW - Ingenieurwissenschaften

UR - http://www.scopus.com/inward/record.url?scp=85047269209&partnerID=8YFLogxK

U2 - 10.3139/147.110518

DO - 10.3139/147.110518

M3 - Zeitschriftenaufsätze

AN - SCOPUS:85047269209

VL - 55

SP - 268

EP - 287

JO - Praktische Metallographie/Practical Metallography

JF - Praktische Metallographie/Practical Metallography

SN - 0032-678X

IS - 5

ER -