Microstructure and mechanical properties of Hf and Ho doped NiAl–Cr(Mo) near eutectic alloy prepared by suction casting

Effect of Au addition on the microstructure and mechanical properties of NiAl intermetallic compound

“…Unfortunately, B addition just changes the fracture model from intergranular to transgranular, but has no help to the RT plastic of NiAl alloy. In addition, some active elements such as Y, Dy, Ho have been found to be able to refine the grain size and improve the oxidation resistance [13][14][15][16]. Although alloying and processing technology have improve the RT toughness or elevated temperature creep strength, NiAl alloys need to investigate further by alloying in order to attain a more reasonable balance of RT toughness and elevated temperature strength.…”

Processing behavior of nanocrystalline NiAl during milling, sintering and mechanical loading and interpretation of its intergranular fracture

“…It is mentioned that in an annealed metal, for example, there is about 10 10 -10 12 dislocations per cm 2 [15]. Table 1 presents a comparison between mechanical properties of NiAl product in our work and literature [5,8,9,24,[27][28][29][30][31][32][33]. Little difference between the results of this work with literature (milling & sinter) can be related to the negligible difference amounts of porosity and grain size of products resulted from different sintering conditions.…”

“…This research Milling and HP [5,8], MA and Shock consolidation [24] Casting [31][32][33], Reactive synthesis and HP [9,[27][28][29][30] Flexural ture morphology, SEM and TEM observation along with XRD-Rietveld refinement results, it seems that the coupling of dislocation-mediated plasticity caused the formation of voids at grain boundaries and triple junctions which resulted in a growing crack with progressive loading and producing intergranular fracture in UFG NiAl. …”

Improvement of compressive strength and ductility in NiAl–Cr(Nb)/Dy alloy by rapid solidification and HIP treatment

“…And moreover, recent studies [19,20] have shown that the rapid solidification and subsequent hot isostatic pressing (HIP) treatment can well improve the mechanical properties of the NiAl based alloy. In addition, the previous researches have revealed that appropriate addition of rare earth elements is beneficial to improving the properties of NiAlbased alloys [12,18,21]. So in the present study, a trace Dy doped Laves phase strengthening NiAl alloy with the composition of Ni45Al-7.5Cr-2.5Nb-0.1Dy (at.%) was chosen and prepared by rapid solidification and treated by HIP, and its microstructure evolution and mechanical properties were investigated.…”