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Method for improving room-temperature ductility of LPSO structural phase-containing Mg-RE-Zn system alloy

An alloy and room temperature technology, which is applied in the field of heat treatment and phase transformation of metal materials, can solve problems such as limited effects, and achieve the effects of simple method, increased elongation, and improved plasticity of alloys

Inactive Publication Date: 2017-06-06
BAOJI TITANIUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The existing methods involving the regulation of long-period ordered structural phases in magnesium alloys mainly use ultrasonic vibrations to change the morphology of bulk LPSO phases on grain boundaries during the solidification process. For example, the patent application number 201610846456.9 has very limited effects. And it does not involve how to transform the massive LPSO structural phase existing in the microstructure after solidification into acicular LPSO structural phase, thereby improving the plasticity of the alloy

Method used

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  • Method for improving room-temperature ductility of LPSO structural phase-containing Mg-RE-Zn system alloy
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  • Method for improving room-temperature ductility of LPSO structural phase-containing Mg-RE-Zn system alloy

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specific Embodiment approach

[0033] The specific implementation of the present invention includes the following steps:

[0034] 1. Alloy melting

[0035] The ingredients are calculated according to the mold size of Φ100×400mm. The raw materials are pure Mg block, pure rare earth Gd, Y and Nd, pure Zn block and Mg-30wt.% Zr intermediate alloy. The designed ingot weight before smelting is 5kg, and the results of smelting and composition testing can be calculated: Mg yield is 98.8%, pure RE yield is 90%, Zn yield is 100%, Mg-30wt. The yield of %Zr master alloy is 25%.

[0036] 1.1 Preparation before smelting

[0037] (1) Weigh, prepare the charge, first remove the corrosives and oxides on the charge, remove the rust from the tools, and preheat all molds, raw materials, fluxes, etc. to 150°C;

[0038] (2) Connect the protective gas pipeline, the protective gas is Ar 2 Gas is used to smelt magnesium alloys with steel crucibles, which are always protected during the smelting process. Temperature control is an important...

Embodiment 2

[0057] The method for improving the room temperature plasticity of the alloy based on the morphology control of the LPSO structural phase proposed in the present invention is to obtain a massive LPSO structural phase after the as-cast Mg-RE-Zn series alloy undergoes two-stage homogenization heat treatment. After the alloy is cooled to a certain temperature with the furnace for short-term heat preservation, and the Mg-RE phase particles and precipitation phases cannot appear in the microstructure during the furnace cooling process, the massive LPSO structure phase is transformed into the needle-like LPSO structure phase. Subsequently, subsequent hot extrusion and aging heat treatment are performed, and finally a highly plastic Mg-RE-Zn alloy containing needle-like LPSO structure phase is obtained.

[0058] This method is suitable for all Mg-RE-Zn series alloys containing LPSO structure phase, but the specific process parameters are adjusted accordingly according to the alloy compos...

Embodiment 3

[0065] The as-cast Mg-7Gd-3Y-1Nd-1Zn-0.5Zr (wt.%) in Example 1 was cooled to 440℃, 450℃, 460℃, 470℃, 480℃ after two-stage homogenization heat treatment. , 490°C, 500°C temperature nodes and heat preservation at the above different temperatures for 2h, and the remaining steps are consistent with those disclosed in Example 1. The mechanical properties of the finally obtained material were tested, and the results are shown in Table 3.

[0066] table 3

[0067] temperature440℃450℃460℃470℃480℃490℃500℃ Sample plasticity A / %7.38.211.5111287

[0068] From the comparison of the data in Table 3, it can be seen that the cooling time is the same with the furnace, but at the four temperature nodes of 440℃, 450℃, 490℃, and 500℃, the plasticity changes little, but it is obviously better than 460℃, 470℃, 480℃. The three temperatures are low, so the above data comparison shows that only in the furnace cooling temperature range of the present invention can the room temperature plasticity of the...

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Abstract

The invention discloses a method for improving the room-temperature ductility of an LPSO structural phase-containing Mg-RE-Zn system alloy, and belongs to the field of thermal treatment of metal and phase change. The method comprises the following steps: carrying out two-stage homogenizing treatment on the cast-state Mg-RE-Zn system alloy for 24 hours under a condition of 480 + / - 10 DEG C and for 32 hours under a condition of 500 + / - 5 DEG C, then cooling the alloy to 460 to 480 DEG C in a furnace, and preserving the heat for 2 hours and 10 minutes, thus obtaining the needle type LPSO structural phase-containing Mg-RE-Zn system alloy. According to the Mg-RE-Zn system alloy prepared through the method disclosed by the invention, under a condition of small change amplitude of the mechanical strength of a material, the percentage elongation of fracture of the material is obviously improved, namely the room-temperature ductility is obviously improved.

Description

Technical field [0001] The invention belongs to the field of heat treatment and phase transformation of metal materials, and specifically relates to a method for improving the room temperature plasticity of a Mg-RE-Zn alloy containing a long-period ordered structure phase (LPSO structure phase for short). Background technique [0002] Mg-RE series alloys have excellent room temperature and high temperature mechanical properties, high high temperature creep resistance and good corrosion resistance, so the research and application of Mg-RE series alloys are becoming more and more extensive. [0003] Recently, scientific research has found that Mg-RE-TM (TM = Zn, Cu, Ni, Co; RE = Y, Gd, Dy, Ho, Er, Tm, Tb) and Mg-Al-Gd alloy have a long Periodic ordered stacking (LPSO) structure phase. The LPSO structure phase is not only a long-period structure ordered phase but also a chemically ordered phase. The Mg-RE-Zn alloy containing the LPSO structure phase has high comprehensive properties. ...

Claims

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Application Information

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IPC IPC(8): C22F1/06
CPCC22F1/06C22F1/002
Inventor 李蒙王俭徐哲张平辉
Owner BAOJI TITANIUM IND
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