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Formation of Al2Ca Phase in as-Extruded X20 Magnesium Alloy by Solution Treatment
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Formation of Al2Ca Phase in as-Extruded X20 Magnesium Alloy by Solution Treatment
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Outstanding Doctoral Dissertation Foundation of Xi’an University of Technology (101-2111004); Open Foundation from State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials (SKL07006) and Shaanxi Provincial Project of Special Foundation of Key Disciplines

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    摘要:

    對Ca含量為2wt%的擠壓態(tài)X20鎂合金在410 ℃固溶處理20 h，采用光學(xué)顯微鏡 (OM)、掃描電鏡 (SEM) 結(jié)合能譜分析 (EDS)以及透射電鏡 (TEM) 對固溶處理前后的組織進(jìn)行了表征，利用XRD衍射儀考察了固溶處理前后合金的相組成。結(jié)果表明，經(jīng)固溶處理后，合金初始組織中β-Mg17Al12相的數(shù)量明顯減少，同時(shí)析出新相Al2Ca。Al2Ca的形成可歸結(jié)于殘余β-Mg17Al12中高的Ca原子所造成的Mg原子被Ca原子取代，同時(shí)Al2Ca相自身高的結(jié)構(gòu)穩(wěn)定性也是其在Mg-Ca和Al-Ca系競爭析出中勝出的原因

    Abstract:

    The as-extruded X20 magnesium alloys containing 2.0wt% Ca were solution-treated at 410 oC for 20 h. The microstructures before and after solution treatment were observed by optical microscope (OM), scanning electron microscope (SEM) together with an energy dispersive spectroscope (EDS), and transmission electron microscope (TEM). The phase compositions before and after solution treatment were confirmed by X-ray diffraction (XRD). The results show that the amount of β-Mg17Al12 phases decreases remarkably after solution treatment, and new Al2Ca phases are formed. The formation of Al2Ca phase might be due to high concentration of Ca atoms in residual β-Mg17Al12 phases, which leads the place of Mg atoms to be substituted by Ca. On the other hand, Al2Ca phase could be also described as a completing product between Al-Ca system and Mg-Ca system intermetallics due to its high structural stability

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謝 輝,賈 磊,張金龍,王智民,呂振林. Formation of Al2Ca Phase in as-Extruded X20 Magnesium Alloy by Solution Treatment[J].稀有金屬材料與工程,2012,41(6):958~961.[Xie Hui, Jia Lei, Zhang Jinlong, Wang Zhimin, Lü Zhenlin. Formation of Al2Ca Phase in as-Extruded X20 Magnesium Alloy by Solution Treatment[J]. Rare Metal Materials and Engineering,2012,41(6):958~961.]
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  • 收稿日期:2011-07-16
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