UACJ CORPORATION

This cold-rolled aluminum alloy sheet has a composition containing 0.15 to 0.40% by mass of Si, 0.30 to 0.80% by mass of Fe, 0.10 to 0.50% by mass of Cu, 0.80 to 1.20% by mass of Mn, and 0.50 to 1.70% by mass of Mg. In the cold-rolled aluminum alloy sheet, the content ratio, expressed in % by mass, of Fe to Si is within the range represented by the formula: 1.97≤Fe/Si≤4.00, the (amount of solid-solubilized Mn)/(total amount of Mn) ratio is 0.17 or more, the amount of solid-solubilized Si is 0.03% by mass or less, and a peak ratio I(18.26°±0.1°)/I(22.45°±0.1°) between a diffraction intensity I at a bragg angle (2θ±0.2°) of 18.26°±0.1° and a diffraction intensity I at a bragg angle of 22.45°±0.1° in an X-ray diffraction pattern is 0.11 or more.

A method of generating a trained model includes: a step of acquiring a process state parameter for every single charge (S 110 ); a step of performing preprocessing by applying machine learning to a data set of one or more process state parameters acquired through m charges (where m is an integer of 2 or greater) (S 130 ); a step of generating a learning data set (S 140 ); and a step of generating a trained model (S 150 ). The learning data set is generated based on n-dimensional features (where n is an integer of 1 or greater) that have been extracted through the preprocessing, and at least contains one or more process target parameters representing process fundamental information that is set for every single charge.

According to a method of producing a joined body of different materials, pushing a rivet including a head portion and a stem portion that has a round columnar shape and projection portions and recessed portions on an outer peripheral surface into a first member, joining the first member and the projection portions and the recessed portions of the rivet, inserting the stem portion of the rivet through the first member, contacting the stem portion of the rivet that is inserted through the first member with a second member that is made of material different from material of the first member, and applying electric current between the head portion of the rivet and the second member with pressing and welding the rivet and the second member to form the joined body of different materials.

Provided is an aluminum alloy brazing sheet in which a first cladding material/a first internal brazing material/core material are stacked in this order, the aluminum alloy brazing sheet is used for brazing in an inert gas atmosphere without using a flux, the first internal brazing material is formed of an aluminum alloy comprising 6.00 mass % to 13.00 mass % of Si, more than 0.50 mass % and 4.50 mass % or less of Mg, and 0.010 mass % to 0.50 mass % of Bi, and formed with the balance being Al and inevitable impurities, and the first cladding material is formed of an aluminum alloy comprising 6.00 mass % to 13.00 mass % of Si and more than 0.050 mass % and 0.50 mass % or less of Mg, having a Bi content of 1.00 mass % or less, and formed with the balance being Al and inevitable impurities. According to the present invention, an aluminum alloy brazing sheet having excellent brazeability in brazing in an inert gas atmosphere without using a flux can be provided.

A method of manufacturing a brazing sheet includes layering at least a core-material slab composed of an aluminum material and a filler-material slab composed of an Al—Si series alloy to prepare a clad slab. At least one aluminum slab in the clad slab, which is disposed in a range from the core-material slab to the filler-material slab inclusive, contains a metal element that oxidizes more readily than Al. The clad slab is hot rolled to prepare a clad sheet that includes a core material composed of the core-material slab and a filler material composed of the filler-material slab. Then, one or more passes of cold rolling is performed on the clad sheet. Between passes of cold rolling or after completion of the cold rolling, at least one surface of the clad sheet is etched using an alkaline etching solution having a sodium hydroxide concentration of 0.05-1.0 mass %.

An aluminum member ( 1 ) includes: a base material ( 2 ) composed of aluminum or an aluminum alloy; and an anodic oxide film ( 3 ) formed on a surface of the base material. The anodic oxide film includes: an amorphous layer ( 31 ), which is composed of an amorphous aluminum oxide and is formed on the base material ( 2 ); and a crystal layer ( 32 ), which is composed of a crystalline aluminum oxide and is formed on the amorphous layer ( 31 ). The aluminum member ( 1 ) can be obtained by forming the anodic oxide film ( 3 ) on the base material ( 2 ) by performing an anodization process on the base material ( 2 ) in an electrolytic solution, which contains boron atoms and has a pH of 7.0-12.0.

A method for producing an aluminum material, including: providing an electrolytic cell in which an anode electrode containing 0.01 to 30% by mass Si and Al and a cathode electrode are immersed in an electrolytic solution and depositing aluminum on the cathode electrode by energizing the anode electrode and the cathode electrode in the electrolytic solution.

One aspect of the present disclosure is an aluminum alloy sheet for a can lid including a silicon (Si) content of 0.20 mass % or more and 0.47 mass % or less; an iron (Fe) content of 0.30 mass % or more and 0.70 mass % or less; a copper (Cu) content of 0.11 mass % or more and 0.40 mass % or less; a manganese (Mn) content of 0.70 mass % or more and 1.20 mass % or less; a magnesium (Mg) content of 1.1 mass % or more and 3.7 mass % or less; and a balance consisting of or including aluminum (Al) and inevitable impurities. The aluminum alloy sheet has a solidus temperature higher than a solid solutionizing temperature of Mg 2 Si.

The present invention intends to provide a substrate for a magnetic disk and a method for manufacturing same, and a magnetic disk capable of holding high flatness after long-term use despite being thin, coping with a high capacity of hard disk, and improving long-term reliability thereof. In the substrate according to the present invention, when a process for heating a substrate at 120° C. for 30 minutes and then cooling the substrate at −40° C. for 30 minutes is defined as one cycle, the flatness PV of a surface of the substrate measured at 25° C. after a thermal impact test in which the cycle is repeatedly performed 200 times is not more than 12 μm. The present invention further encompasses a magnetic disk having a similar flatness PV under the same conditions. The present invention still further encompasses a method for manufacturing the substrate for a magnetic disk.

A heat-transfer member ( 1 ) includes: a base material ( 2 ) that is composed of an inorganic compound containing a metal or a metal element; and an oxide layer ( 3 ) that is composed of an oxide or oxides of the metal element contained in the base material ( 2 ) and is formed on the base material ( 2 ). The oxide layer ( 3 ) has a plurality of pores ( 31 ), which include: first portions ( 312 ) that have openings ( 311 ) on the surface of the heat-transfer member ( 1 ), the openings ( 311 ) having an average opening diameter of 5 nm or larger and 70 nm or smaller; and second portions ( 313 ) that have an average pore diameter larger than the average opening diameter of the first portions ( 312 ) and are continuous with the first portions ( 312 ). The average depth of the second portions ( 313 ) is 600 nm or more and 20 μm or less.