Thermal treatment method suitable for magnetism alloy with age-hardening property

Abstract

The invention discloses a thermal treatment method suitable for magnetism alloy with an age-hardening property. The magnetism alloy with the age-hardening property is Mg-xM-0.6Zr-0.2Mn based alloy, M contains Sn, Pb, Zn and rare earth, and x ranges from 5 to 20 wt%. When multiple kinds of rare earth elements are included, the contents of all rare earth elements are same. Solid solution is carried out on the magnetism alloy under an isobaric outer field of 0.5 to 1GPa and 0.7 to 0.85 Tm (Tm: the melting point of the alloy), and the time of solid solution ranges from 2 to 4 hours. Pressure is removed after the treatment; the hot water ranges from 60 to 80 DEG C is directly used for cooling; under the external stress of 30 to 50 MPa and the pulse electric field of 1 to 10 Kv / cm, room temperature aging is carried out for 10 to 50 thousands of pulses per hour, and the pulse interval is 1 second; and the peak hardness can be acquired. The thermal treatment method suitable for the magnetism alloy with the age-hardening property has the advantages of simplicity in operation technology, short aging time, low aging temperature, low energy consumption and the like.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to a magnesium alloy heat treatment method. Background technique [0002] Solid solution strengthening, fine grain strengthening and aging precipitation strengthening are the three main strengthening methods of magnesium alloys. Among the three main strengthening methods, the effect of aging precipitation strengthening is particularly significant. The final mechanical properties of magnesium alloys are closely related to the heat treatment process of the alloys. In recent years, different types of heat treatment processes have been developed for different types of magnesium alloys. Such as graded solid solution, double aging, vibration heat treatment and strain heat treatment, etc. have appeared one after another. To sum up, the purpose of all the above heat treatment processes is to increase the volume fraction of the aging precipitation strengthening phase and optimize the m...

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Problems solved by technology

However, this traditional T6 heat treatment method has the following disadvantages: 1. Because the atomic radius of alloying elements is too large and the diffusion rate is slow, the temperature is generally set above 180°C during aging, and when it is lower than 180°C due to time If it is too long, it is difficult to observe the aging strengthening phenomenon; 2. Due to the high aging temperature, the supersaturation degree of the solute is reduced, so the volume fraction of the precipitation strengthening phase is reduced, and the strengthening effect is weakened; 3. Since magnesium has a hexagonal structure, so , most of the coherent or semi-coherent precipitates in the aging process are acicular phases or flakes, and it is difficult to obtain spherical strengthening phases, which significantly reduces the plasticity of the alloy; 4. The temperature of the traditional aging process is too high and the time is too long , time-consuming and energy-consuming

However, this heat treatment method has a certain solid solution temperature, a certain solid solution alloying element, and the aging temperature is basically unchanged, and the volume fraction of the strengthening phase that can be precipitated is constant, so the strengthening effect is limited.

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