45results about How to "Deterioration of mechanical properties" patented technology

Provided is a method for manufacturing steel thin-wall welding equal-strength components with aluminum or aluminum alloy coatings. A steel plate to be welded comprises a base body and at least one coating on the surface of the base body. Each coating comprises an intermetallic compound alloy layer in contact with the base body and a metal alloy layer on the intermetallic compound alloy layer. Thecoatings do not need to be removed or thinned before welding or in the welding process; by presetting the welding gap and using a carbon manganese steel welding wire, a welding process and protectivegas for welding, after a welding component is subjected to hot stamping treatment, the tensile strength of a weld joint is greater than the tensile strength of a base material, the extension rate of the weld joint is greater than 4%, and the application requirement of the equal-strength welding components in the hot stamping field is met.

The invention provides a preparation method of an alloying-element-strengthened high-silicon aluminum composite and belongs to the technical field of material preparation. The preparation method is particularly suitable for preparation of electronic packaging material. The designed alloying-element-strengthened high-silicon aluminum composite comprises, by mass percent, 48.0%-52.0% of silicon, 0.5%-4.0% of X and the balance aluminum. The X is copper and / or magnesium. The preparation method of the alloying-element-strengthened high-silicon aluminum composite comprises the steps that a silicon source, an aluminum source and an X source are prepared according to the designed components, the prepared silicon source, the prepared aluminum source and the prepared X source are smelted, and then a melt is obtained; and atomized spray deposition is conducted on the obtained melt, so that a deposition preform is obtained, hot isostatic pressing treatment is conducted on the deposition preform, and then a finished product is obtained, wherein during hot pressing pressure treatment, the temperature is controlled to be 520-600 DEG C, and the pressure is controlled to be 150-200 MPa. The designed composite has the advantages of being excellent in comprehensive performance, outstanding in mechanical property, low in preparation cost and the like and is suitable for large-scale industrial production.

The invention discloses five-element high-entropy alloy Cu0.5FeNiVAlx and a strength and hardness improvement method thereof. The five-element high-entropy alloy Cu0.5FeNiVAlx mainly comprises Cu, Fe,Ni, V and Al with purities greater than or equal to 99.9%. The five-element high-entropy alloy Cu0.5FeNiVAlx comprises, by atomic percent, 10 to 15 at% of the Cu, 20 to 30 at% of the Fe, 20 to 30 at%of the Ni, 20 to 30 at% of the V, and 0 to 26 at% of the Al. A preparation method of the five-element high-entropy alloy Cu0.5FeNiVAlx is as follows: performing arc-strike smelting in a vacuum environment protected by argon gas on the alloy raw materials Cu, Fe, Ni, V and Al for repeated several times. The strength and hardness improvement method of the five-element high-entropy alloy Cu0.5FeNiVAlx is as follows: using a quartz tube for vacuum sealing of a prepared Cu0.5FeNiVAlx ingot, then using a muffle furnace at 500 DEG C, 750 DEG C and 1000 DEG C respectively for annealing treatment, andfinally thermally-insulating and cooling to room temperature. The five-element high-entropy alloy Cu0.5FeNiVAlx obtained by the method has an effective improvement in strength and hardness, and contributes to broadening the application range of a high-entropy alloy and improving the economic value.