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La和Nd復(fù)合添加對AZ91鎂合金鑄態(tài)組織和性能的影響
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四川省科技廳重點攻關(guān)項目(04GG1589)


Effects of La and Nd Co-addition on Microstructure and Mechanical Properties
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    摘要:

    利用SEM和XRD等方法研究了總添加量為2.5%(質(zhì)量分?jǐn)?shù), 下同)的單加或復(fù)合添加La和Nd的AZ91鎂合金的鑄態(tài)顯微組織和相組成，并測試和分析了合金的室溫力學(xué)性能。結(jié)果表明：單加或復(fù)合添加2.5%的La和Nd使AZ91合金中的β相Mg17Al12數(shù)量明顯減少。單加La和單加Nd在AZ91合金中形成的稀土相分別是針狀的Al11La3和塊狀的Al2Nd；二者復(fù)合加入時兩種稀土相同時出現(xiàn)，Al11La3相和Al2Nd相的尺寸較單加時有所減小，其相對含量與兩種稀土元素添加量成正比。當(dāng)復(fù)合添加La和Nd時，Al11La3相中的部分La和Al2Nd相中的部分Nd分別被Nd和La置換。相對于單一添加，復(fù)合添加La和Nd能更顯著地改善AZ91的力學(xué)性能。本實驗研究的合金中，AZ91+1.0%La+1.5% Nd合金力學(xué)性能最好，其鑄態(tài)合金的抗拉強度和延伸率分別為235 MPa和10%

    Abstract:

    The microstructures and phase composition of as-cast AZ91 magnesium alloys with addition of 2.5wt% RE (RE=La, La and Nd or Nd) in total were investigated by SEM/EDS and XRD. The mechanical properties of the alloys were analyzed at room temperature. The results show that the β-Mg17Al12 amount of AZ91 alloy is decreased evidently with the 2.5wt% addition of RE. The Al-RE phases of Mg-9Al-1Zn-2.5La and Mg-9Al-1Zn-2.5Nd are acicular Al11La3 and particle-like Al2Nd, respectively. Both Al11La3 and Al2Nd are formed with co-addition of La and Nd, whose sizes are smaller than those of single addition. The relative content of the two Al-RE phases is proportional to the addition content of La and Nd. Part of La in Al11La3 or Nd in Al2Nd is substituted by Nd or La respectively when La and Nd are co-added into AZ91 alloy. Compared with single addition of La or Nd, co-addition can improve the mechanical properties of as-cast AZ91 alloy more significantly. In all magnesium alloys investigated, the Mg-9Al-1Zn-1.0La-1.5Nd alloy exhibits the best mechanical properties, whose UTS is 235 MPa and d is 10% at room temperature

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趙源華,陳云貴,趙 冬,肖素芬,唐永柏,魏尚海,章曉萍,王 卿. La和Nd復(fù)合添加對AZ91鎂合金鑄態(tài)組織和性能的影響[J].稀有金屬材料與工程,2010,39(8):1470~1474.[Zhao Yuanhua, Chen Yungui, Zhao Dong, Xiao Sufen, Tang Yongbai, Wei Shanghai, Zhang Xiaoping, Wang Qing. Effects of La and Nd Co-addition on Microstructure and Mechanical Properties[J]. Rare Metal Materials and Engineering,2010,39(8):1470~1474.]
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  • 收稿日期:2009-08-27
  • 最后修改日期:2010-04-29
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