An aluminum alloy, an aluminum alloy wire, an aluminum alloy stranded wire, a covered electric wire, and a wire harness that are of high toughness and high electrical conductivity, and a method of manufacturing an aluminum alloy wire are provided. The aluminum alloy wire contains not less than 0.005% and not more than 2.2% by mass of Fe, and a remainder including Al and an impurity. It may further contain not less than 0.005% and not more than 1.0% by mass in total of at least one additive element selected from Mg, Si, Cu, Zn, Ni, Mn, Ag, Cr, and Zr. The Al alloy wire has an electrical conductivity of not less than 58% IACS and an elongation of not less than 10%. The Al alloy wire is manufactured through the successive steps of casting, rolling, wiredrawing, and softening treatment. The softening treatment can be performed to provide an excellent toughness such as elongation and impact resistance and thereby reduce fracture of the electric wire in the vicinity of a terminal portion when the wire harness is installed.

Aluminum alloy wire

Deformation behavior and microstructure evolution of titanium alloys with lamellar microstructure in hot working process: A review

Effect of β (110) texture intensity on α-variant selection and microstructure morphology during β→α phase transformation in near α titanium alloy

An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

Current understanding of the principles underlying the thermomechanical processing (TMP) of α/β titanium alloys is reviewed. Attention is focused on the formulation of constitutive descriptions for plastic flow under hot-working conditions, the evolution of microstructure, the occurrence of defects, and novel/emerging TMP techniques. With regard to constitutive behavior, descriptions of the plastic flow of the individual phases and two-phase alloys per se are summarized. The important influence of phase morphology, size, and volume fraction on plastic flow is emphasized. Mechanisms which underlie microstructure evolution include beta recrystallization (in the high-temperature β field), the development of dislocation substructure and its effect on dynamic and static spheroidization of colony microstructures (in the two-phase field), static and dynamic coarsening of primary α, and the development of deformation and transformation textures. In the area of defects, the effect of TMP variables and starting microstructure on the formation of cavities, the persistence of microtexture, and the development of undesirably-coarse β grain structures are described. The current status of relatively new processing techniques for α/β titanium alloys such as low-temperature superplastic forming and solid-state joining (via linear friction or friction-stir methods) are also briefly reviewed. Last, R&D which could help to resolve deficiencies in the current knowledge base for TMP of α/β titanium alloys are summarized for each of the areas.

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An Overview of the Thermomechanical Processing of α/β Titanium Alloys: Current Status and Future Research Opportunities

A flux-cored wire for different-material bonding which, when used for bonding an aluminum-based material to an iron-based material, heightens the bonding strength and has satisfactory welding efficiency; a method of bonding different materials; and a joint obtained by the method. In particular, the method is for use in the fusion welding of a high-tension steel material to a 6000-series aluminum alloy material, which are high-strength different materials, and in the bonding of a zinc-plated steel material. One embodiment employs a flux-cored wire comprising an aluminum sheath and a flux with which the inside of the sheath is filled, wherein the flux is a fluoride composition containing a specific amount of AlF3 and containing no chloride and the sheath comprises an aluminum alloy containing 1-13 mass% silicon. Use of such flux-cored wire in the fusion welding of a high-tension steel material to a 6000-series aluminum alloy material, which are high-strength different materials, gives a high bonding strength.

Flux-cored wire for different-material bonding and method of bonding different materials

Disclosed is an aluminum alloy sheet resistant to deterioration through natural aging. The aluminum alloy sheet is an Al—Mg—Si aluminum alloy sheet containing 0.35 to 1.0 percent by mass of magnesium; 0.5 to 1.5 percent by mass of silicon; 0.01 to 1.0 percent by mass of manganese; and 0.001 to 1.0 percent by mass of copper, with the remainder being aluminum and inevitable impurities, in which the amount of dissolved silicon is 0.55 to 0.80 percent by mass, the amount of dissolved magnesium is 0.35 to 0.60 percent by mass, and the ratio of the former to the latter is 1.1 to 2. The aluminum alloy sheet may further contain 0.005 to 0.2 percent by mass of titanium with or without 0.0001 to 0.05 percent by mass of boron.

Aluminum alloy sheet

Microstructure evolution during deformation of a near-α titanium alloy with different initial structures in the two-phase region

This invention provides a joint product between a steel product and an aluminum material, which can realize spot welding with high bonding strength, and a spot welding method for the joint product. In one embodiment, a steel product (1) having a sheet thickness t1 of 0.3 to 3.0 mm is joined to an aluminum material (2) having a sheet thickness t2 of 0.5 to 4.0 mm by spot welding to form a joint product between the steel product and the aluminum material. The joint product is characterized in that the nugget area in the joint is 20 × t20.5 to 100 × t20.5 mm2, the area of a part where the thickness of an interface reaction layer is 0.5 to 3 µm, is not less than 10 × t20.5 mm2, and the difference in thickness of the interface reaction layer between the joint center and a point distant from the joint center by a distance of one-fourth of the joint diameter DC is not more than 5 μm. The above constitution can provide a high-bonding strength joint product, between dissimilar materials, which can be formed without newly using other materials such as clad materials and without newly adding a separate step using an existing spot welding apparatus at low cost, and a spot welding method.

Joint product between steel product and aluminum material, spot welding method for the joint product, and electrode chip for use in the joint product

The purpose is to provide a joined body of dissimilar materials comprising steel material and aluminum material, which can be obtained by spot welding with high joining strength; and a spot welding method therefor. A joined body (3) is obtained by spot welding a particular thick steel material (1) and an aluminum material (2). The area of a nugget (5) in a spot weld is determined in relation to the plate thickness of the aluminum material (2). The area of the portion of a boundary reaction layer (6) having a thickness of 0.5-10 μm in the nugget (5) is determined in relation to the plate thickness of the aluminum material (2), and high joining strength is obtained.

Katsushi Matsumoto

Papers

Flux-cored wire for different-material bonding and method of bonding different materials

Aluminum alloy sheet

Microstructure evolution during deformation of a near-α titanium alloy with different initial structures in the two-phase region

Joint product between steel product and aluminum material, spot welding method for the joint product, and electrode chip for use in the joint product

Joined body of dissimilar materials comprising steel material and aluminum material, and joining method therefor