Disclosed is a method for grain growth mitigation in titanium, zirconium, and/or hafnium materials. The method may include heating a titanium, zirconium, and/or hafnium material in a processing atmosphere to a first temperature above a transus temperature of the material. At a point in time before the material is at the first temperature, the method may include introducing hydrogen gas into the processing atmosphere to achieve a predetermined hydrogen partial pressure in the processing atmosphere. The method may include holding the material at the first temperature in the processing atmosphere at the predetermined hydrogen partial pressure for a first period of time.

Disclosed is a method for grain growth mitigation in titanium, zirconium, and/or hafnium materials. The method may include heating a titanium, zirconium, and/or hafnium material in a processing atmosphere to a first temperature above a transus temperature of the material. At a point in time before the material is at the first temperature, the method may include introducing hydrogen gas into the processing atmosphere to achieve a predetermined hydrogen partial pressure in the processing atmosphere. The method may include holding the material at the first temperature in the processing atmosphere at the predetermined hydrogen partial pressure for a first period of time.

Provided is a method for producing a Ni- or Ti-based alloy product, the method capable of reliably locally cooling and effectively cooling. The method includes the steps: heating and holding a hot working material of a Ni- or Ti-based alloy after hot forging or hot ring rolling at a solution treatment temperature to obtain a material held in a heated state, and cooling the material held in a heated state to obtain a solution-treated material. The cooling step includes carrying out local cooling by contacting a cooling member with a part of a surface of the material held in a heated state.

The present disclosure relates to a titanium or titanium alloy member and to a surface hardening method for the titanium or titanium alloy member. The titanium or titanium alloy member includes a base material of titanium or titanium alloy, and at a surface of the base material, a hardened layer formed by diffusion of oxygen into the surface.

The present disclosure relates to a titanium or titanium alloy member and to a surface hardening method for the titanium or titanium alloy member. The titanium or titanium alloy member includes a base material of titanium or titanium alloy, and at a surface of the base material, a hardened layer formed by diffusion of oxygen into the surface.

The present disclosure relates to TiMn-based or TiCrMn-based hydrogen storage alloys capable of absorbing and releasing hydrogen. In preferred embodiments the disclosure relates to TiMn-based or TiCrMn-based hydrogen storage alloys comprising ferrovanadium (VFe).

The present disclosure relates to TiMn-based or TiCrMn-based hydrogen storage alloys capable of absorbing and releasing hydrogen. In preferred embodiments the disclosure relates to TiMn-based or TiCrMn-based hydrogen storage alloys comprising ferrovanadium (VFe).

The disclosure provides a modified tin-phosphor bronze alloy and a preparation method thereof. The modified tin-phosphor bronze alloy comprises the following elements in percentage by mass: 4.0-10 wt % of Sn, 0.01-0.3 wt % of P and the balance of Cu and inevitable impurity elements, the average grain size of the modified tin-phosphor bronze alloy is 1-3 m, the grain size is in normal distribution, and the standard deviation of the grain size is below 0.8 m; the proportion of the total low-CSL grain boundary in the modified tin-phosphor bronze alloy in the whole grain boundary is 66-74%, and in the total low-CSL grain boundary, the ratio range of (9+27)/3 is (0.12-0.23):1. The modified tin-phosphor bronze alloy of this disclosure enables a finished alloy can give consideration to both tensile strength and excellent bending performance.

The disclosure provides a modified tin-phosphor bronze alloy and a preparation method thereof. The modified tin-phosphor bronze alloy comprises the following elements in percentage by mass: 4.0-10 wt % of Sn, 0.01-0.3 wt % of P and the balance of Cu and inevitable impurity elements, the average grain size of the modified tin-phosphor bronze alloy is 1-3 m, the grain size is in normal distribution, and the standard deviation of the grain size is below 0.8 m; the proportion of the total low-CSL grain boundary in the modified tin-phosphor bronze alloy in the whole grain boundary is 66-74%, and in the total low-CSL grain boundary, the ratio range of (9+27)/3 is (0.12-0.23):1. The modified tin-phosphor bronze alloy of this disclosure enables a finished alloy can give consideration to both tensile strength and excellent bending performance.

A copper alloy bonded body composed of a plurality of members made of an age-hardenable copper alloy, the members diffusion-bonded to one another. The copper alloy bonded body has undergone solution annealing and an aging treatment, the content of beryllium in the age-hardenable copper alloy is 0.7% by weight or less, and (i) a bonding interface between the members has disappeared and/or (ii) a bonding interface between the members remains, and an oxide film at the bonding interface has a thickness of 0 nm or more and 5.0 nm or less.