Mechanism of the influence of hydrogen on the self-diffusion of nickel

Archakov, Yu. I.; Dobrotvorskii, A. M.; Pokhmurs'kyi, V. I.; Федоров, В. В.

doi:10.1007/bf00559142

Cited by 5 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Increased hydrogen-induced defect concentrations and the relationship to increased self-diffusivity has been discussed in the literature for several other transition metals, including Ni, Pd, Cr, and Nb. 40,41 Therefore, it is clear that hydrogen increases selfdiffusion in several metals, including titanium alloys.…”

Section: Discussionmentioning

confidence: 99%

Powder Casting: Producing Bulk Metal Components from Powder Without Compaction

Paramore

Dunstan

Butler

et al. 2020

JOM

View full text Add to dashboard Cite

Powder casting was developed to produce metal components with near-theoretical density from low-cost, loose powder using hydrogen sintering and phase transformation. This has significant implications for non-beam metal additive manufacturing processes (e.g., metal extrusion AM, binder jetting, and ordered powder lithography), which produce green parts with relatively low densities. Additionally, powder casting can enable the production of geometries typically not suitable for powder processing, such as plate and bar stock. In the current study, Ti-6Al-4V, Zr, and Hf were densified to 99.2%, 95.7%, and 94.0% of their respective theoretical densities, when sintered from loose powder at 1200°C for 4 h. The relative density and pore size distributions of Ti-6Al-4V produced by powder casting were very similar to those produced by press-and-sinter HSPT. The powder-cast Ti-6Al-4V samples also displayed ductility consistent with press-and-sinter HSPT. However, they exhibited lower strength due to unintentional overheating during the dehydrogenation step.

show abstract

Section: Discussionmentioning

confidence: 99%

Powder Casting: Producing Bulk Metal Components from Powder Without Compaction

Paramore

Dunstan

Butler

et al. 2020

JOM

View full text Add to dashboard Cite

show abstract

“…The changes in the activation energies have been mainly ascribed to the indirect electronic effect of impurity atoms in the strength of metallic bonds. 33 The activation energy of the H atoms, Q A , monotonically decreases when x is increased. The observed dependence of Q A with x is very similar to that found in R 2 Fe 14 BH x ͑R = Ho, Nd͒ compounds and can be explained with the same simple thermodynamic model.…”

Section: E Diffusing Entities and Activation Energiesmentioning

confidence: 99%

Origin of the anomalous contributions to the ac magnetic susceptibility of rare-earth–iron intermetallic compounds

et al. 2009

View full text Add to dashboard Cite

A systematic ac magnetic susceptibility, ac ͑T͒, study has been performed on several R 2 Fe 14 BH x ͑R = rare earth͒ compounds in order to determine the origin of the anomalous behavior of ac ͑T͒ not related to spin reorientation transitions-the so-called non-SRT anomalies. All the measurements have been performed on magnetically oriented samples to identify the anomalies due to domain-wall displacements. Different types of non-SRT anomalies have been found. It has been found that the anomalous behavior is mainly due to the existence of mobile defects coupled to the domain walls, which existence has been confirmed by performing magnetic aftereffect measurements. However, this mechanism alone cannot explain the whole phenomenology and other influences on ac ͑T͒ have to be taken into account to correctly describe the non-SRT anomalies. Specifically, three situations are possible when analyzing the anomalous behavior of ac ͑T͒: ͑1͒ compounds with no magnetic R anisotropy, in which the non-SRT anomalies are due to the existence of one or more mobile defects coupled to the domain walls, ͑2͒ compounds in which a large magnetic R anisotropy can influence the domain-wall mobility at very low temperatures, and ͑3͒ compounds in which a large magnetic R anisotropy and the existence of SRTs can influence the response of the domain walls coupled to mobile defects. Different fitting models have been proposed for each case.

show abstract