Spray Deposited Magnesium Alloys With Nd Hot Compressive Deformation And Organization Study

Magnesium alloy prouduced by Spray deposited has the characteristics offine grains and homogeneous microstructure etc. Compared with traditional castmagnesium alloys, which greatly improved the alloy mechanical property andcorrosion resistance, and the preparation of magnesium alloy greatly reduced theprocess flow compared with powder metallurgy. Spray deposited magnesium alloypreparation has an important theory and application value.The plastic distortion of magnesium research at home and abroad are mostlyconcentrated in the cast magnesium alloys, But the report for magnesium alloythermal simulation research which included lanthanon of Nd spray deposition adoptedin the paper is little. This paper adopts magnesium alloy included Nd by spraydeposited extrusion state to study the spray deposited magnesium alloy extrusion stateof plastic deformation characteristics of magnesium alloys for high provide theorybasis. OM and SEM and XRD are used to study of the organizational characteristicsof alloy and deformation mechanism determined primarily, including magnesiumalloy Nd rational processing parameters. In order to study the deformation in differentconditions including the rare earth Nd spray deposition fast cooling extrusion stateafter the characteristics of magnesium alloys deformation, A part of magnesium alloybars heat treatment, take extrusion state bar and heat treatment state in350℃bar,wewill contrast research the strain rate in0.001s-1¹s-1single word time under thermalsimulation.Take extrusion state bar in330℃conditions thermal simulation researchand study the flow stress behavior in double ways. The main conclusions are asfollows:（1）Spray deposited included Nd extrusion state and heated treatment state in350℃magnesium alloy strain rate of1s-1single channel times compressed thegrains will be refined happened dynamic recrystallization and there is an obviousinstability phenomenon, dynamic recrystallization is probably have the causes of thephenomenon.（2）Extrusion and heated treatment state magnesium alloy in350℃, strain rate of0.001¹s-1thermal simulation compression deformation, with the increase of strainrate, organization become more and more density, strain rate in1s-1appeared dynamicrecrystallization caused the grain size difference change contributed to instabilityhappens, the state of an object is except Mg and Al₂Ca, and a small amount ofMg_0.97Zn_0.03. with the increase of strain rate, things have not changed the phase composition. Heated treatment state in compression deformation of magnesium alloyafter things have Mg and Al₂Ca phase, and a small amount of AlMg₂Zn.（3）Extrusion state in330℃magnesium alloy double ways for secondarycompression process, between the5s and30s time interval, stress-strain curveinstability phenomena of more obvious, in the time interval between stress and straincurve after30s than5s of stress at intervals, with the increased time interval, becausethe original grain growth and recrystallization grain size increases the deformationcaused by poor when the energy is not harmonious, therefore the instability of theperformance more obvious.