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快速凝固Mg-Si-RE(La,Ce)鎂合金的微觀組織及其摩擦磨損行為研究
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南昌大學(xué)

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National Natural Science Foundation of China (Nos.52061031;Nos. 51665036）


Microstructure and friction and wear behavior of fast solidified Mg-Si-RE (La, Ce) magnesium alloys
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    摘要:

    本文利用快速凝固工藝制備了Mg-Si-RE鎂合金并對(duì)其顯微組織及在不同載荷下的摩擦磨損行為和磨損機(jī)制進(jìn)行分析。研究發(fā)現(xiàn)，快速凝固Mg-Si-RE合金的顯微組織主要由α-Mg基體、Mg2Si共晶相和REMg2Si2納米稀土相組成。對(duì)摩擦系數(shù)和磨損量隨載荷變化的關(guān)系曲線分析表明，Mg-Si-RE合金的摩擦磨損性能明顯優(yōu)于Mg-1Si基體合金，由輕微磨損轉(zhuǎn)變?yōu)閲?yán)重磨損時(shí)的載荷比基體合金低20N，且在高載荷時(shí)磨損量遠(yuǎn)遠(yuǎn)小于基體合金，120N時(shí)的磨損量?jī)H為基體合金的50%。Mg-Si-RE合金的磨損機(jī)制包括氧化磨損、磨粒磨損和剝層磨損，其優(yōu)異的摩擦磨損性能主要?dú)w功于析出了彌散分布與晶界和晶內(nèi)的納米稀土相。同時(shí)，稀土元素能對(duì)鎂合金基體起到固溶強(qiáng)化作用，有效提高了Mg-Si-RE合金的摩擦磨損性能。實(shí)驗(yàn)還發(fā)現(xiàn)加入不同種類的稀土元素后，Mg-Si-RE合金表現(xiàn)出不同的摩擦磨損行為。

    Abstract:

    In this paper microstructure, friction and wear behavior under different loads of Mg-Si-RE magnesium alloys fabricated by rapid solidified process were studied. It was found that the microstructure of the fast-solidified state Mg-Si-RE alloy mainly consists of α-Mg matrix, eutectic Mg2Si phases and REMg2Si2 nano phases with 500-800 nm size. The relationship curve of friction coefficient and wear quantity with load of Mg-Si-RE alloy is determined. Results show that the friction and wear performance of Mg-Si-RE alloy is obviously better than that of Mg-1Si matrix alloy. The load of changed from slight wear to serious wear is lower than that of matrix alloy 20 N. And the wear amount is much smaller than that of matrix alloy at high load. The wear mechanism of Mg-Si-RE alloy includes oxidation wear, abrasive wear and delamination wear. The excellent friction and wear performance of RSP Mg-Si-RE alloy is mainly due to that the nano-scale rare earth phases were well dispersed along the grain boundary and within α-Mg matrix. Moreover, the Mg-Si-RE alloys exhibit different frictional wear behaviors after the addition of different types of rare earth elements.

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李瑤輝,李克,尹文來(lái),戴佳.快速凝固Mg-Si-RE(La, Ce)鎂合金的微觀組織及其摩擦磨損行為研究[J].稀有金屬材料與工程,2022,51(1):266~272.[Li yaohui, Li ke, Yin wenlai, Dai jia. Microstructure and friction and wear behavior of fast solidified Mg-Si-RE (La, Ce) magnesium alloys[J]. Rare Metal Materials and Engineering,2022,51(1):266~272.]
DOI：10.12442/j. issn.1002-185X.20210047

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  • 收稿日期:2021-01-16
  • 最后修改日期:2021-03-29
  • 錄用日期:2021-03-31
  • 在線發(fā)布日期: 2022-02-09
  • 出版日期: 2022-01-28