High-strength cast Mg alloy containing rare-earth and preparing process thereof

Abstract

A high-strength cast RE-contained Mg-alloy contains Nd (2.5-3.6 Wt%), Zr (0.35-0.8), Zn (0-0.4), Ca (0-0.5), impurities (0-0.02) and Mg (rest). It is prepared through smelting Mg, adding Nd, Zr and Ca in Mg-Nd, Mg-Zr and Mg-Ca alloy mode, adding Zn, solution treating at 525-540 deg.C for 4-12 hr, quenching in water and ageing at 200 deg.C for 12-20 hr. It has high strength, hardness and high-temp creep performance.

Description

technical field

[0001] The invention relates to a rare earth-containing high-strength cast magnesium alloy and a preparation method thereof, in particular to a preparation method for obtaining a high-strength magnesium alloy by adding alloy elements (Nd, Zr, Zn, Ca) and changing the process conditions of smelting and heat treatment , the prepared magnesium alloy has mechanical properties such as room temperature strength, hardness, and high temperature creep performance superior to traditional commercial magnesium alloy ZM6. It belongs to the field of metal materials and metallurgy. Background technique

[0002] Magnesium rare earth alloys have good room temperature, high temperature mechanical properties and corrosion resistance, and are a class of magnesium alloys with very good application prospects; however, the high cost of magnesium rare earth alloys severely limits the wide application of magnesium rare earth alloys, especially in civil applications ; Magnesium rare ...