Effect of heat treatments on the microstructure and mechanical properties of directionally solidified multiphase intermetallic Ni-Al-Cr-Ta-Mo-Zr alloy

DSpace/Manakin Repository

aaK citaci nebo jako odkaz na tento záznam použijte identifikátor: http://hdl.handle.net/10084/56258

Show simple item record


dc.contributor.author Lapin, J.
dc.contributor.author Mareček, J.
dc.contributor.author Kursa, Miroslav
dc.date.accessioned 2006-09-20T08:56:23Z
dc.date.available 2006-09-20T08:56:23Z
dc.date.issued 2006
dc.identifier.citation Kovové materiály = Metallic materials. 2006, roč. 44, č. 1, s. 1 - 11. en
dc.identifier.issn 0023-432X
dc.identifier.uri http://hdl.handle.net/10084/56258
dc.language.iso en en
dc.publisher Ústav materiálov a mechaniky strojov Slovenskej akadémie vied en
dc.relation.ispartofseries Kovové materiály = Metallic materials en
dc.relation.uri http://www.kovmat.sav.sk/abstract.php?rr=44&cc=1&ss=1 en
dc.subject nickel aluminides en
dc.subject Ni3Al en
dc.subject NiAl en
dc.subject microstructure en
dc.subject heat treatment en
dc.subject mechanical properties en
dc.title Effect of heat treatments on the microstructure and mechanical properties of directionally solidified multiphase intermetallic Ni-Al-Cr-Ta-Mo-Zr alloy en
dc.type article en
dc.identifier.location Ve fondu ÚK en
dc.description.abstract-en The effect of heat treatments on the microstructure and mechanical properties of directionally solidified (DS) multiphase intermetallic Ni-21.9Al-8.1Cr-4.2Ta-0.9Mo-0.3Zr (in at.%) alloy was studied. Two-step solution annealing of DS alloy at 1373 K for 100 h and 1483 K for 2 h leads to dissolution of spherical α-Cr and needle-like γ´ (Ni3Al) precipitates within the β (NiAl) dendrites. In the interdendritic region, dissolution of Cr-based particles and formation of irregular shaped γ areas in the vicinity of dendritic-interdendritic interfaces were observed. During ageing at temperatures from 1223 to 1323 K the growth of spherical α-Cr and lath-shaped γ´ precipitates in the β dendrites was observed. In the interdendritic region, the ageing leads to intensive precipitation of lath-shaped α-Cr precipitates, formation of irregular shaped Cr-based particles and transformation of γ matrix (Ni-based solid solution) with γ´ precipitates to the γ´ matrix with needle-like γ precipitates. The studied heat treatments can be successfully applied to soften the DS alloy. All Vickers hardness values measured for specimens aged at 1273 and 1323 K are lower than those for DS samples. A linear relationship between the Vickers hardness and compressive yield strength is determined for DS and heat-treated (HT) specimens, which allows the mechanical properties of the alloy to be predicted from simple hardness measurements. Optimal combination of the yield strength, ultimate compressive strength and plastic deformation to fracture is achieved after ageing at 1323 K for 30 h.
dc.identifier.wos 000236903100001

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Advanced Search

Navigation

Browse

My Account

Statistics