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
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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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