Processing method for improving high temperature creep properties of magnesium alloys by extrusion and hammering

A processing method, high-temperature creep technology, applied in the field of magnesium alloy processing, to achieve the effects of precise control, low equipment requirements, and high production efficiency

Active Publication Date: 2022-03-18
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to improve the high-temperature creep properties of magnesium alloys through traditional magnesium alloy processing technology has not been reported in the existing literature, and it is also a technical problem that needs to be solved to expand the application range of magnesium alloys.

Method used

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  • Processing method for improving high temperature creep properties of magnesium alloys by extrusion and hammering
  • Processing method for improving high temperature creep properties of magnesium alloys by extrusion and hammering
  • Processing method for improving high temperature creep properties of magnesium alloys by extrusion and hammering

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Experimental program
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Effect test

Embodiment 1

[0031] Magnesium alloys were prepared by water-cooled semi-continuous casting. Pure magnesium ingots (Mg 99.9%), pure aluminum ingots (Al 99.9%), pure zinc ingots (Zn99.9%), Al-Mn master alloys and Mg-Y master alloys were prepared. The as-cast structure of magnesium alloy is obtained by smelting and pouring. The mass percentage composition of magnesium alloy is Al: 8.5%, Zn: 0.90%, Mn: 0.3%, Y: 0.5%, and the rest are magnesium and irremovable impurity elements.

[0032] The as-cast microstructure was subjected to solution treatment at 380℃×12h; then the solid-solution microstructure was extruded, the extrusion temperature was 400℃, the extrusion ratio was 16:1, and the extrusion speed was 17mm / s. The apparent quality of the magnesium alloy is good, and the EBSD microstructure of the magnesium alloy after extrusion is as follows: figure 1 It can be seen that it has an obvious preferred orientation, and the texture strength of its 0001 base surface is 6.35; then the extruded str...

Embodiment 2

[0036] Magnesium alloys were prepared by water-cooled semi-continuous casting. Pure magnesium ingots (Mg 99.9%), pure aluminum ingots (Al 99.9%), pure zinc ingots (Zn99.9%), Al-Mn master alloys and Mg-Y master alloys were prepared. The as-cast structure of magnesium alloy is obtained by smelting and pouring. The mass percentage composition of magnesium alloy is Al: 9.5%, Zn: 0.45%, Mn: 0.4%, Y: 0.8%, and the rest are magnesium and irremovable impurity elements.

[0037]The as-cast structure is subjected to solution treatment at 400°C×8h; then the solid solution structure is extruded at a temperature of 350°C, an extrusion ratio of 8:1, and an extrusion speed of 20mm / s. EBSD microstructure of magnesium alloys such as Figure 5 As shown, it can be seen that it has an obvious preferred orientation, and the texture strength of its 0001 base plane is 7.44; then the extruded structure is hammered with a small amount of deformation, the hammering direction is parallel to the extrusio...

Embodiment 3

[0040] The magnesium alloy was prepared by water-cooled semi-continuous casting method. Pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn99.9%), Al-Mn master alloy and Mg-Y master alloy Smelting and pouring to obtain the as-cast structure of the magnesium alloy, the mass percent composition of the magnesium alloy is: Al: 0.91%, Zn: 0.61%, Mn: 0.15%, Y: 0.3%, and the rest is magnesium and impurity elements that cannot be removed.

[0041] The as-cast structure is subjected to solution treatment at 420°C×4h; then the solid solution structure is extruded at a temperature of 450°C, an extrusion ratio of 25:1, and an extrusion speed of 15mm / s. EBSD microstructure of magnesium alloys such as Figure 7 As shown, the extruded microstructure has obvious preferred orientation, and the texture strength of its 0001 base plane is 6.82; The temperature is room temperature (about 20°C), the number of hammering is 1 time, the hammering strain is 3%, and the...

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Abstract

The invention discloses a processing method for improving the high-temperature creep performance of a magnesium alloy through extrusion and hammering, and is characterized in that: the mass percentage composition of the magnesium alloy is: Al: 8.5%-9.5%, Zn: 0.45%-0.90%, Mn : 0.15% to 0.4%, Y: 0.3% to 0.8%, and the rest are magnesium and impurity elements that cannot be removed; the processing method includes the following steps: 1), carrying out solid solution treatment on magnesium alloy; The magnesium alloy is extruded, the extrusion temperature is 350-450°C, the extrusion rate is 15-20mm / min, and the extrusion ratio is 8:1-25:1; 3) Air hammer is carried out on the extruded magnesium alloy Hammering, the hammering direction is parallel to the extrusion direction, the hammering temperature is room temperature, the number of hammering is 1-4 times, the cumulative hammering strain is 1-3%, and the speed of the hammer head before it touches the magnesium alloy is 1m / s ~40m / s. In the present invention, by adjusting the microstructure of magnesium alloy, the magnesium alloy undergoes creep dynamic precipitation during high-temperature creep process, and the creep dynamic precipitation phase improves the thermal stability of the material and improves the high-temperature creep performance. Application promotion is of great significance.

Description

technical field [0001] The invention relates to a processing method for improving the high temperature creep performance of magnesium alloys by extrusion and hammering, and belongs to the technical field of magnesium alloy processing. Background technique [0002] Magnesium alloys are alloys based on magnesium and other elements. Its characteristics are: low density (1.8g / cm 3 left and right), high strength, large elastic modulus, good heat dissipation, good shock absorption, greater impact load capacity than aluminum alloy, and good corrosion resistance to organic substances and alkalis. At present, the most widely used is magnesium-aluminum alloy, followed by magnesium-manganese alloy and magnesium-zinc-zirconium alloy. Mainly used in aviation, aerospace, transportation, chemical, rocket and other industrial sectors. AZ91 magnesium alloy is one of the most widely used magnesium alloys in commercial use, and its main use states are as-cast and aged. The as-cast structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/02
CPCC22F1/06C22C23/02
Inventor 黄伟颖李微黄煌周小杰何建军
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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