An aluminum alloy and a preparation method thereof are provided. In percentage by mass, the aluminum alloy includes: 8-11% of Si, 2-3% of Cu, 0.7-1.1% of Mg, 0.7-1.5% of Mn, 0.01-0.015% of Sr, 0.01-0.015% of Cr, 0-0.4% of Fe, 0.02-0.1% of Ti, 0.01-0.02% of Ga, 0.004-0.02% of B, 0-2% of Zn, and the balance of Al and less than 0.1% of other elements.

Aluminum-magnesium alloys useful as welding wire and mechanical support are disclosed. The aluminum-magnesium alloys exhibit improved cold wire drawing performance. Grain refiners and methods of forming the aluminum-magnesium alloys are further disclosed.

An embodiment of the present invention provides a steel material, for a pressure vessel, comprising, in weight %, 0.06-0.25% of carbon (C), 0.05-0.50% of silicon (Si), 1.0-2.0% of manganese (Mn), 0.005-0.40% of aluminum (Al), 0.010% or less of phosphorus (P), 0.0010% or less of sulfur (S), 0.001-0.03% of niobium (Nb), 0.001-0.03% of vanadium (V), 0.001-0.03% of titanium (Ti), 0.01-0.20% of chromium (Cr), 0.05-0.15% of molybdenum (Mo), 0.01-0.50% of copper (Cu), 0.05-0.50% of nickel (Ni), 0.0005-0.0050% of magnesium (Mg), 0.0005-0.0050% of calcium (Ca), 0.0020% or less of oxygen (O), and the remainder being Fe and other unavoidable impurities. A microstructure comprises in terms of area fraction 30% or less of pearlite and the remainder being ferrite. A non-metallic inclusion contains Mg—Al—Ca—O composite oxide.

An aluminum material, a preparation method thereof, and a bowl-shaped aluminum block are provided in the present disclosure, which relates to the technical field of alloys. Controlling the amount of manganese to 0.03-0.5 wt % in the present disclosure can improve the structure and enhance the impact mechanical properties of aluminum material; nickel can improve the strength and rust resistance of aluminum material, strontium can form an aluminum-strontium combination to adjust the crystal orientation of the metal lattice, which can improve molding and greatly enhance flexibility, and zirconium has a synergistic effect, which can improve the corrosion resistance of aluminum material, and improve surface gloss. The aluminum material provided by the present disclosure has a hardness of 23-30 HB, a tensile strength of 70-100 MPa, a yield strength of 35-59 MPa, and an elongation at break of 40-60%.

Methods for the manufacture of fine metal powders from metal carboxylate compounds such as metal oxalate compounds. The method includes decomposing particulates of the metal oxalate compound by heating to a decomposition temperature in the presence of a dilute hydrogen gas to decompose the metal oxalate compound, and forming a fine metal powder by heating to a higher refining temperature to remove contaminants from the metal powder. The method may include the conversion of a non-oxalate metal compound to a hydrated metal oxalate and the dehydration of the hydrated metal oxalate before decomposition to the metal. The method is applicable to the production of a wide variety of metals, and is particularly applicable to the production of rare earth metals of high purity and fine particle size.

Provided are maraging steel alloys having improved microstructures. Some variations provide maraging steel alloys including a base maraging steel alloy, a grain refiner, and optionally, a strengthening element. The base maraging steel alloy is surface-functionalized with the grain refiner. Other variations provide a method of method of manufacturing maraging steel including mixing a base maraging steel alloy with a grain refiner resulting in a maraging steel mixture, melting the maraging steel mixture, and solidifying the maraging steel mixture forming an equiaxed microstructure.

Provided are maraging steel alloys having improved microstructures. Some variations provide maraging steel alloys including a base maraging steel alloy, a grain refiner, and optionally, a strengthening element. The base maraging steel alloy is surface-functionalized with the grain refiner. Other variations provide a method of method of manufacturing maraging steel including mixing a base maraging steel alloy with a grain refiner resulting in a maraging steel mixture, melting the maraging steel mixture, and solidifying the maraging steel mixture forming an equiaxed microstructure.

The present disclosure relates to the technical field of metal materials, and more specifically, to a non-heat treated aluminum alloy stress-bearing member material with high toughness and high casting performance and its preparation method. The non-heat treated aluminum alloy stress-bearing member material with high toughness and high casting performance includes the following components in terms of mass percentage: Si: 8.5-12.0%, Mg: 0.10-0.35%, Mn: 0.25-0.4%, Cr: 0.02-0.14%, V: 0.02-0.38%, Sr: 0.01-0.04%, Ti: 0.05-0.11%, B≤0.005%, Ca≤0.05%, Zr≤0.1%, Zn≤0.1%, RE≤0.1%. The total amount of other impurities is less than or equal to 0.25%, and the balance is Al. Under the premise of ensuring that the alloy has good die casting performance, the die-casting parts in non-heat-treated state can have excellent comprehensive mechanical properties, thereby meeting the performance requirements of the die casting stress-bearing member.

An aluminum-alloy ingot contains TiB2 aggregates (2) dispersed in an aluminum matrix (1). The TiB2 aggregates (2) are formed by aggregation of TiB2 particles (3). The average value of the circle-equivalent diameters of the TiB2 aggregates (2) in the state in which the TiB2 aggregates (2) are exposed at a surface of the aluminum matrix (1) is 3.0 μm or less and the average value of the circularities is 0.20 or more.

A solder alloy essentially consists of tin, silver, copper, bismuth, antimony, and cobalt. Relative to a total amount of the solder alloy, the silver content is 2 mass % or more and 4 mass % or less, the copper content is 0.3 mass % or more and 1 mass % or less, the bismuth content is more than 4.8 mass % and 10 mass % or less, the antimony content is 3 mass % or more and 10 mass % or less, the cobalt content is 0.001 mass % or more and 0.3 mass % or less, and the tin content is the remaining portion.