A method of modifying a microstructure of a titanium material can include providing a solid titanium material in an inert atmosphere, where the solid titanium material has an initial microstructure with an initial grain size and which is optionally anisotropic. The method can also include introducing hydrogen through a thermal process into the solid titanium material, resulting in a titanium alloy article having a refined microstructure that has a final grain size that is smaller than the initial grain size, or reduced anisotropy, or a combination thereof.

A method of modifying a microstructure of a titanium material can include providing a solid titanium material in an inert atmosphere, where the solid titanium material has an initial microstructure with an initial grain size and which is optionally anisotropic. The method can also include introducing hydrogen through a thermal process into the solid titanium material, resulting in a titanium alloy article having a refined microstructure that has a final grain size that is smaller than the initial grain size, or reduced anisotropy, or a combination thereof.

This hot-dip Zn-based plated steel sheet includes a steel sheet and a plating layer formed on at least part of a surface of the steel sheet, in which the plating layer has a chemical composition that includes, by mass %, Al: 6.00% to 35.00%, Mg: 2.00% to 12.00%, Ca: 0.005% to 2.00%, Si: 0% to 2.00%, Fe: 0% to 2.00%, Sb: 0% to 0.50%, Sr: 0% to 0.50%, Pb: 0% to 0.50%, Sn; 0% to 1.00%, Cu: 0% to 1.00%, Ti: 0% to 1.00%, Ni: 0% to 1.00%, Mn: 0% to 1.00%, Cr: 0% to 1.00%, and a remainder: Zn and impurities; the plating layer has an area ratio of a MgZn.sub.2 phase in a range of 15% to 60% in a cross section in a thickness direction, and the MgZn.sub.2 phase includes a Ca-based intermetallic compound having a circle equivalent diameter of 0.10 m or smaller.

This hot-dip Zn-based plated steel sheet includes a steel sheet and a plating layer formed on at least part of a surface of the steel sheet, in which the plating layer has a chemical composition that includes, by mass %, Al: 6.00% to 35.00%, Mg: 2.00% to 12.00%, Ca: 0.005% to 2.00%, Si: 0% to 2.00%, Fe: 0% to 2.00%, Sb: 0% to 0.50%, Sr: 0% to 0.50%, Pb: 0% to 0.50%, Sn; 0% to 1.00%, Cu: 0% to 1.00%, Ti: 0% to 1.00%, Ni: 0% to 1.00%, Mn: 0% to 1.00%, Cr: 0% to 1.00%, and a remainder: Zn and impurities; the plating layer has an area ratio of a MgZn.sub.2 phase in a range of 15% to 60% in a cross section in a thickness direction, and the MgZn.sub.2 phase includes a Ca-based intermetallic compound having a circle equivalent diameter of 0.10 m or smaller.

A slit copper material comprises 99.96% by mass or greater of Cu. In this slit copper material, a ratio W/t of a plate width W to a plate thickness t is 10 or greater, an electrical conductivity is 97.0% IACS or greater, a ratio B/A of an average crystal grain size B in a plate surface layer portion to an average crystal grain size A in a plate center portion is in a range of 0.80 or greater and 1.20 or less, and the average crystal grain size A in the plate center portion is 25 m or less.

A slit copper material comprises 99.96% by mass or greater of Cu. In this slit copper material, a ratio W/t of a plate width W to a plate thickness t is 10 or greater, an electrical conductivity is 97.0% IACS or greater, a ratio B/A of an average crystal grain size B in a plate surface layer portion to an average crystal grain size A in a plate center portion is in a range of 0.80 or greater and 1.20 or less, and the average crystal grain size A in the plate center portion is 25 m or less.

A high entropy alloy composition and methods of manufacturing such composition are provided. In one embodiment, the composition includes iron (Fe) in a range of 0-30% by weight, nickel (Ni) in a range of 20-55% by weight, cobalt (Co) in a range of 5-45% by weight, chromium (Cr) in a range of 0-40% by weight, aluminum (Al) in a range of 0-20% by weight, manganese (Mn) in a range of 0-5% by weight, and niobium in a range of 0-10% by weight.

A high entropy alloy composition and methods of manufacturing such composition are provided. In one embodiment, the composition includes iron (Fe) in a range of 0-30% by weight, nickel (Ni) in a range of 20-55% by weight, cobalt (Co) in a range of 5-45% by weight, chromium (Cr) in a range of 0-40% by weight, aluminum (Al) in a range of 0-20% by weight, manganese (Mn) in a range of 0-5% by weight, and niobium in a range of 0-10% by weight.

Provided are a hydrogen storage material containing a TiFe-based alloy, a hydrogen storage container including the hydrogen storage material, and a hydrogen supply apparatus including the hydrogen storage container. The hydrogen storage material contains an alloy of an elemental composition represented by Formula (1), in which, in 1000 magnified COMP image of cross section of the alloy obtained by EPMA, 25 or more and 3000 or less pieces of a phase in which R is enriched and that have phase sizes of 0.1 m or more and 10 m or less are present in a field of view of 85 m120 m of the COMP image, and an R-enriched phase area ratio of total area S.sub.R m.sup.2 of pieces of the phase present in the field of view to area S m.sup.2 of field of view is 0.3% or more and 6.0% or less:

Ti.sub.(1ab)R.sub.aM1.sub.bFe.sub.cMn.sub.dM2.sub.eC.sub.f(1).

Provided are a hydrogen storage material containing a TiFe-based alloy, a hydrogen storage container including the hydrogen storage material, and a hydrogen supply apparatus including the hydrogen storage container. The hydrogen storage material contains an alloy of an elemental composition represented by Formula (1), in which, in 1000 magnified COMP image of cross section of the alloy obtained by EPMA, 25 or more and 3000 or less pieces of a phase in which R is enriched and that have phase sizes of 0.1 m or more and 10 m or less are present in a field of view of 85 m120 m of the COMP image, and an R-enriched phase area ratio of total area S.sub.R m.sup.2 of pieces of the phase present in the field of view to area S m.sup.2 of field of view is 0.3% or more and 6.0% or less:

Ti.sub.(1ab)R.sub.aM1.sub.bFe.sub.cMn.sub.dM2.sub.eC.sub.f(1).