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High-strength high-plasticity magnesium alloy and preparation method thereof

A magnesium alloy, high plasticity technology, applied in the field of magnesium alloy, can solve the problems of low strength and poor plasticity

Active Publication Date: 2016-03-09
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-strength and high-plasticity die-casting magnesium alloy and its preparation method for the current commercial Mg-Al series die-casting magnesium alloys with low strength and poor plasticity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Preheat magnesium ingots and aluminum ingots to 250°C, heat and melt them in a furnace preheated to 350°C, and form a melt after the alloy is completely melted. When the melt is heated to 720°C, put zinc ingots, Mg-La , Mg-Nd, Mg-Ca, Mg-Y, and Al-Mn intermediate alloys are directly added to the melt, and after the alloys added to the melt are melted, mechanically stir for 2 minutes at a stirring speed of 30r / min, and stir evenly; The homogenized melt was heated up to 740°C, Ar gas was passed into the bottom of the melt, refined and stirred for 10 minutes, the gas pressure was 0.5Mpa, and the ventilation rate was 5L / min; then it was kept for 20 minutes. Finally, the refined melt is cooled to 700°C, the surface scum is removed, and the die-casting production is carried out on a cold chamber die-casting machine. The first- and second-stage injection speeds of die-casting production are 0.16m / s, and the third-stage injection speed is 5.5m / s. m / s, the pouring temperature is ...

Embodiment 2

[0028] Preheat magnesium ingots and aluminum ingots to 250°C, heat and melt them in a furnace preheated to 350°C, and form a melt after the alloy is completely melted. When the melt is heated to 700°C, put zinc ingots, Mg-La , Mg-Nd, Mg-Ca, Mg-Y, and Al-Mn intermediate alloys are directly added to the melt, and after the alloys added to the melt are melted, mechanically stir for 5 minutes at a stirring speed of 60r / min, stir evenly, and then stir The homogenized melt was heated up to 730°C, Ar gas was passed into the bottom of the melt, refined and stirred for 5 minutes, the gas pressure was 0.2Mpa, and the ventilation rate was 2L / min; then it was kept for 50 minutes. Finally, the refined melt is cooled to 690°C, the surface scum is removed, and the die-casting production is carried out on the cold chamber die-casting machine. The first-stage and second-stage injection speeds of die-casting production are 0.2m / s, and the third-stage injection speed is 6m. / s, the pouring tempe...

Embodiment 3

[0033] Preheat magnesium ingots and aluminum ingots to 250°C, put them into a furnace preheated to 350°C, heat and melt to form a melt, and form a melt after the alloy is completely melted. When the melt is heated to 710°C, put zinc ingots, Mg-La, Mg-Nd, Mg-Ca, Mg-Y, Al-Mn intermediate alloys are directly added to the melt, and after the alloys added to the melt are melted, mechanically stir for 4 minutes at a stirring speed of 50r / min, stirring evenly; Then raise the temperature of the stirred melt to 750°C, pass Ar gas into the bottom of the melt, refine and stir for 8 minutes, the gas pressure is 0.4Mpa, and the ventilation rate is 4L / min; then keep warm and stand for 30 minutes. Finally, the refined melt is cooled to 680°C, the surface scum is removed, and the die-casting production is carried out on the cold chamber die-casting machine. The first-stage and second-stage injection speeds of die-casting production are 0.11m / s, and the third-stage injection speed is 5m / s, th...

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Abstract

The invention discloses high-strength high-plasticity magnesium alloy and a preparation method thereof. The high-strength high-plasticity magnesium alloy comprises, by mass, 7.5%-9.0% of Al, 0.5%-1.0% of Zn, 0.1%-0.5% of Mn, 0.1%-1.0% of La, 0.1%-1.0% of Y, 0.1%-1.0% of Nd, 0.1%-1.0% of Ca, and the balance Mg and inevitable impurity elements. Due to the compound addition of the multiple elements and the mutual influences between the elements, the solid solubility of the elements in a magnesium matrix can be reduced, and the usage amount of rare earth is reduced; moreover, the strengthening effect of the alloy can be obviously improved, and accordingly, the magnesium alloy with high strength and high plasticity is obtained.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a high-strength and high-plasticity magnesium alloy and a preparation method thereof. Background technique [0002] As environmental problems become more and more prominent, the transportation industry pays more and more attention to lightweight and high-performance materials. Magnesium alloy has the incomparable advantages of aluminum alloy such as light density, high specific strength and specific stiffness, good die-casting performance and damping performance, and it is an inevitable development trend to completely replace aluminum alloy. At present, the most common commercial die-casting magnesium alloys are Mg-Al alloys. Among them, the room temperature tensile strength, yield strength and elongation of AZ91 alloy (Mg-9Al-1Zn) with better mechanical properties are 230Mpa, 150MPa and 3.5Mpa respectively. %, its value is much lower than that of aluminum alloy, especially the low plasticit...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/03B22D17/00
CPCB22D17/00C22C1/03C22C23/02
Inventor 苏再军杨树忠普建周健文小强周强袁德林王玉香
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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