US20130101458A1 - Magnesium alloy and method for making the same - Google Patents

Magnesium alloy and method for making the same Download PDF

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Publication number
US20130101458A1
US20130101458A1 US13/311,913 US201113311913A US2013101458A1 US 20130101458 A1 US20130101458 A1 US 20130101458A1 US 201113311913 A US201113311913 A US 201113311913A US 2013101458 A1 US2013101458 A1 US 2013101458A1
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United States
Prior art keywords
magnesium alloy
alloy
magnesium
making
solution
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Abandoned
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US13/311,913
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English (en)
Inventor
Jie Wang
Hsien-Tsung Li
Kam-Shau Chan
Xing-Xing Wang
Rui-Feng Fan
Yi Li
Jun-Feng Zhao
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Fuzhun Precision Industry Shenzhen Co Ltd
Foxconn Technology Co Ltd
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Fuzhun Precision Industry Shenzhen Co Ltd
Foxconn Technology Co Ltd
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Assigned to FOXCONN TECHNOLOGY CO., LTD., FU ZHUN PRECISION INDUSTRY (SHEN ZHEN) CO., LTD. reassignment FOXCONN TECHNOLOGY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAN, KAM-SHAU, FAN, Rui-feng, LI, HSIEN-TSUNG, LI, YI, WANG, JIE, WANG, Xing-xing, ZHAO, Jun-feng
Publication of US20130101458A1 publication Critical patent/US20130101458A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent

Definitions

  • the present disclosure relates to magnesium alloys, particularly to a magnesium alloy having good processing property and high corrosion resistance, and a method for making the same.
  • Magnesium alloys have low density, high mechanical strength, high thermal conductivity, high electrical conductivity, good electromagnetic interference shielding property, and good machining property, and have been widely used in the aerospace, automotive industries and consumer electronic devices.
  • general-grade magnesium alloys have an unfavorable processing property due to the insufficient ductibility and toughness thereof, and products made from material thereof have a bad corrosion resistance.
  • FIG. 1 shows a flowchart of a method for making a magnesium alloy of an illustrated embodiment.
  • FIG. 2 shows a table presenting the results of the mechanical properties of the magnesium alloy from an example 1 at room temperature.
  • FIG. 3 shows a table presenting the results of the mechanical properties of the magnesium alloy from an example 2 at room temperature.
  • FIG. 4 shows a table presenting the results of the mechanical properties of the magnesium alloy from an example 3 at room temperature.
  • FIG. 5 shows a table presenting the results of the mechanical properties of the magnesium alloy from the example 1 at 170° C.
  • FIG. 6 shows a table presenting the results of the mechanical properties of the magnesium alloy from the example 2 at 170° C.
  • FIG. 7 shows a table presenting the results of the mechanical properties of the magnesium alloy from the example 3 at 170° C.
  • FIG. 8 shows a table presenting the results of the mechanical properties of the AZ91D magnesium alloy at room temperature.
  • FIG. 9 shows a table presenting the results of the mechanical properties of the AZ91D magnesium alloy at 170° C.
  • FIG. 10 shows a table presenting the results of the mechanical properties of the magnesium alloy from an example 4 at room temperature.
  • FIG. 11 shows a table presenting the results of the mechanical properties of the magnesium alloy from the example 4 at 170° C. .
  • FIGS. 12( a )-( d ) shows a plurality of microstructure images of the magnesium alloy obtained from the example 1 and the example 4.
  • FIG. 13 shows a table presenting the results of etching weight per square centimeter when dipping the magnesium alloy from the example 1 and the AZ91D magnesium alloy in salt water.
  • An embodiment of a magnesium alloy contains the following: about 7.0 weight (wt) % to about 8.0 wt % aluminum (Al), about 0.45 wt % to about 0.90 wt % zinc (Zn), about 0.17 wt % to about 0.40 wt % manganese (Mn), about 0.50 wt % to about 1.5 wt % rare earth elements (RE), about 0.0005 wt % to about 0.0015 wt % beryllium (Be), and the rest being magnesium (Mg) and unavoidable impurities.
  • the preferred range of Al is about 7.2 wt % to about 7.8 wt %.
  • RE is preferably made of one or more material selected from the group consisting of cerium (Ce), lanthanum (La), praseodymium (Pr), neodymium (Nd), yttrium (Y) and any suitable combination thereof.
  • the preferred range of RE is about 0.50 wt % to about 0.8 wt %. In the illustrated embodiment, the RE is Nd.
  • a method for making the above-described magnesium alloy of the illustrated embodiment includes the following steps.
  • raw materials are provided.
  • the raw materials contains: about 7.0 wt % to about 8.0 wt % Al, about 0.45 wt % to about 0.90 wt % Zn, about 0.17 wt % to about 0.40 wt % Mn, about 0.50 wt % to about 1.5 wt % RE, about 0.0005 wt % to about 0.0015 wt % Be, and the rest being Mg and impurities.
  • the Al (composition) includes pure Al and an Al—Be inter-alloy
  • the Zn includes pure Zn
  • the Mn includes anhydrous manganese dichloride (MnCl 2 )
  • the RE includes a Mg—RE inter-alloy
  • the Be includes an Al—Be inter-alloy
  • the Mg includes pure Mg and a Mg—RE inter-alloy.
  • the RE (composition) can be one or more materials selected from the group consisting of Ce, La, Pr, Nd, Y, and any suitable combination thereof.
  • a raw Mg—Al—Zn solution is formed.
  • the pure Mg is melted, and the pure Al, the pure Zn, and the anhydrous MnCl 2 are added into the melted Mg at a temperature of about 700 degrees Celsius, such that the raw Mg—Al—Zn solution is obtained.
  • a refined Mg—Al—Zn solution is formed.
  • a refining flux is added into the above-mentioned raw Mg—Al—Zn solution to remove impurities at a temperature of about 720 degrees Celsius, and the temperature is maintained for 0.5 hours to obtain the refined Mg—Al—Zn solution.
  • the refining flux is a combination of chlorides and fluorides, such as magnesium dichloride (MgCl 2 ), potassium chloride (KCl), calcium fluoride (CaCl 2 ) and so on.
  • a Mg—Al—Zn-RE solution is formed.
  • the Mg—RE inter-alloy and the Al—Be inter-alloy are added into the refined Mg—Al—Zn solution at a temperature of about 730 degrees Celsius, and a mixture of the above-mentioned solution and alloys is stirred for about 0.5 hours to obtain the Mg—Al—Zn-RE solution.
  • the pure RE and the pure Be may be added instead of the Mg—RE inter-alloy and the Al—Be inter-alloy.
  • a Mg—Al—Zn—RE alloy is formed.
  • the above-mentioned Mg—Al—Zn—RE solution is cooled to a temperature of about 670 degrees Celsius, and then casted to obtain the Mg—Al—Zn—RE alloy.
  • the preferred RE is Nd. It is understood that the RE can be one or more materials selected from the group consisting of Ce, La, Pr, Nd, Y, and any suitable combination thereof.
  • An example 1 of the method for making the magnesium alloy of the embodiment is as follows.
  • a plurality of raw materials are provided.
  • the raw materials contain about 7.5 wt % Al, about 0.68 wt % Zn, about 0.28 wt % Mn, about 0.50 wt % RE, about 0.0010 wt % Be, and the rest being Mg and unavoidable impurities.
  • the Al (composition) includes pure Al and Al—Be inter-alloy
  • the Zn includes pure Zn
  • the Mn includes anhydrous manganese dichloride (MnCl 2 )
  • the RE includes a Mg—Nd inter-alloy
  • the Be includes an Al—Be inter-alloy
  • the Mg includes pure Mg and a Mg—Nd inter-alloy.
  • the weight ratio (in percent) of Nd in the Mg—Nd inter-alloy is about 20%.
  • a raw Mg—Al—Zn solution is formed.
  • the pure Mg is melted, and the pure Al, the pure Zn, and the anhydrous MnCl 2 are added into the melted Mg at a temperature of about 700 degrees Celsius, such that the raw Mg—Al—Zn solution is obtained.
  • a refined Mg—Al—Zn solution is formed.
  • a refining flux is added into the above-mentioned raw Mg—Al—Zn solution to remove impurities at a temperature of about 720 degrees Celsius, and the temperature is maintained for about 0.5 hours to obtain the refined Mg—Al—Zn solution.
  • a Mg—Al—Zn—Nd solution is formed.
  • the Mg—Nd inter-alloy and the Al—Be inter-alloy are added into the refined Mg—Al—Zn solution at a temperature of about 730 degrees Celsius, and a mixture of the above-mentioned solution and alloys is stirred for about 0.5 hours to obtain the Mg—Al—Zn—Nd solution.
  • a Mg—Al—Zn—Nd alloy is formed.
  • the above-mentioned Mg—Al—Zn—Nd solution is cooled to a temperature of about 670 degrees Celsius, and then casted to obtain the Mg—Al—Zn—Nd alloy.
  • An example 2 of the method for making the magnesium alloy of the embodiment is similar to the example 1 of the method for making the magnesium alloy of the embodiment.
  • the raw materials in the first step, contain about 1.0 wt % RE.
  • the Al, Zn, Mn, and Be have the same respective wt % or ratios as for the example 1, and the rest is Mg and unavoidable impurities.
  • An example 3 of the method for making the magnesium alloy of the embodiment is similar to the example 1 of the method for making the magnesium alloy of the embodiment.
  • the raw materials contain about 1.5 wt % RE.
  • the Al, Zn, Mn, and Be have the same respective wt % or ratios as for the example 1, and the rest is Mg and unavoidable impurities.
  • An example 4 of the method for making the magnesium alloy of the embodiment is similar to the example 1 of the method for making the magnesium alloy of the embodiment.
  • the RE in the first step, includes a Mg—RE inter-alloy, and the Mg includes pure Mg and a Mg—Ce—La inter-alloy.
  • the RE contains the combination of Ce and La.
  • the weight ratio (in percent) of Ce to RE is about 65%, and the weight ratio (in percent) of La to RE is about 35%.
  • the total weight ratio (in percent) of Ce and La in the Mg—RE inter-alloy is about 20%.
  • the tensile strength, the percentage of elongation, and the yield strength of the magnesium alloy samples of the above examples 1, 2, and 3 and those of the AZ91D magnesium alloy sample were tested according to ASTM E8M-04 Standard Test Methods for Tension Testing of Metallic Materials at room temperature and at a temperature of about 170 degrees Celsius, respectively.
  • the impact toughness of the magnesium alloy samples of the above examples 1, 2, and 3 and those of the AZ91D magnesium alloy sample were tested according to ASTM E3-04 Standard Test Methods for Notched Bar Impact Testing of Metallic Materials. The results are shown in FIGS. 2 through 9 .
  • the average values of the mechanical parameters of 30 samples obtained at room temperature and that of 10 samples obtained at a temperature 170 degrees Celsius are shown in Table 1.
  • the magnesium alloys of the embodiment of the instant disclosure have a relatively low Al content, and contains RE.
  • the magnesium alloys of the respective examples 1, 2, and 3 have relatively excellent mechanical properties at room temperature, especially the percentage of elongation and the impact toughness.
  • the magnesium alloys of the respective examples 1, 2, and 3 have relatively excellent percentage of elongation at a temperature of 170 degrees Celsius.
  • the concentrated RE hinders the growth of the magnesium alloy grains, which refines the grains of the magnesium alloy, thereby enhanced the mechanical properties of the magnesium alloy. If the RE content is high, the percentage of elongation and the impact toughness will first be reduced and then increased afterwards; in addition, the higher the cost of the magnesium alloy becomes. Therefore, the RE content is preferably about 0.5 wt %.
  • the magnesium alloy from the example 1 has relatively excellent mechanism properties at room temperature, especially the percentage of elongation and the impact toughness, and the magnesium alloy of the example 1 has relatively excellent percentage of elongation at a temperature of 170 degrees Celsius.
  • the scale of grains of the magnesium alloy form the example 1 is smaller than that of grains of the magnesium alloy from the example 4, that is to say, in the illustrated embodiment, Nd has a better refining effect or capability for the magnesium alloy grains than that of the Ce—La combination. Thereby, the magnesium alloy added with Nd has an excellent set of material or mechanical properties.
  • the corrosion resistance of the magnesium alloy from the example 1 of the embodiment and the AZ91D magnesium alloy were tested by a salt water dipping method.
  • the salt water dipping method includes the following steps: a magnesium alloy sample having a length of about 20 mm, a width of about 20 mm, and a thickness of about 5 mm is dipped into about 5 wt % sodium chloride solution for about 96 hours; the volume of hydrogen released during the time period is tested; and the corrosion weight per square centimeters of the sample is calculated according to the hydrogen volume.
  • the test results are shown in FIG. 13 .
  • the average values of the corrosion weight of the example 1 and AZ91D are shown in Table 3.
  • the corrosion resistance of the magnesium alloy of the example 1 of the embodiment of instant disclosure is greater than that of the AZ91D magnesium alloy. Because the combining force between RE and oxygen is greater than that between magnesium and oxygen, during the melting process, RE can combine with oxygen to form RE oxide, such that the oxygen impurities can be removed. In addition, during the melting process, magnesium is easily reacted with water vapor to release hydrogen gas, such that gas hole can be caused in magnesium alloy casting, which negatively affects the corrosion resistance of the magnesium alloy. RE can react with hydrogen, thereby preventing the gas hole from forming, and thus the corrosion resistance can be improved.
  • the magnesium alloys of the examples of the embodiment of instant disclosure have a good processing property, and products made from thereof have a good corrosion resistance.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Powder Metallurgy (AREA)
US13/311,913 2011-10-20 2011-12-06 Magnesium alloy and method for making the same Abandoned US20130101458A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2011103205796A CN103060650A (zh) 2011-10-20 2011-10-20 镁合金及其制备方法
CN201110320579.6 2011-10-20

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CN100371486C (zh) * 2004-12-24 2008-02-27 北京有色金属研究总院 一种镁合金及其制备方法
CN100519799C (zh) * 2007-12-29 2009-07-29 中国科学院长春应用化学研究所 含铈镧高强耐蚀压铸镁合金

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