Process for manufacturing hot-forged parts made of a magnesium alloy

Abstract

A process for manufacturing a process for manufacturing a part made of a magnesium alloy is disclosed. The process includes a step of forging a block of the alloy followed by a heat treatment. The alloy is a casting alloy based on 85% magnesium, and containing, by weight: 0.2 to 1.3% zinc; 2 to 4.5% neodymium; 0.2 to 7.0% rare-earth metal with an atomic number from 62 to 71; 0.2 to 1% zirconium. The forging is carried out at a temperature above 400° C. In particular the temperature is set between 420 and 430° C. and the forging step comprises a plastic deformation carried out at a slow rate. The process allows one to produce parts such as elements of casing for aeronautical machines, operating at a temperature of around 200° C. and having good aging properties.

Description

technical field [0001] The invention relates to the field of metal processing, more particularly to the processing of magnesium alloys. Background technique [0002] To produce some high performance machine components, it is common practice to use aluminum or aluminum alloys due to their light weight mechanical properties. For these reasons, they are used in particular in automobiles and aeronautical machines. Typically, parts, such as engine casing parts, are machined from sheets or blanks obtained by casting techniques. However, the thermal stability of these materials becomes insufficient when dealing with components that are exposed in operation to temperatures in the range of 150-180° C. and above. In use, this weakness is more pronounced due to deformation and loss of mechanical strength. Increasing their weight is not a solution in this field, where weight is an important factor in material selection. [0003] It has been proposed to replace this metal with a magn...

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Problems solved by technology

This reduces the benefit of their application

[0004] Moreover, to the applicant's knowledge, there is only one industrial wrought magnesium alloy WE43 with sufficiently stable properties in the field of use at temperatures above 180 ° C, but it is very expensive

[0005] However, according to the prior art, it is acceptable that the tensile and yield strengths of magnesium alloy ingots are adversely affected by the temperature at which the deformation takes place

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