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重力鑄造Mg-3Nd-0.2Zn-Zr鎂合金高周疲勞行為的研究
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國家高技術(shù)研究發(fā)展計(jì)劃（“863”計(jì)劃）（2009AA033501）


Study on High Cycle Fatigue Behavior of Gravity Cast Mg-3Nd-0.2Zn-Zr Magnesium Alloy
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    摘要:

    對(duì)重力金屬型鑄造 (GPC) 和重力砂型鑄造(GSC)Mg-3Nd-0.2Zn-Zr(NZ30K) (質(zhì)量分?jǐn)?shù)，%)合金T6態(tài)的顯微組織、室溫拉伸性能和室溫拉壓疲勞性能 (R= –1) 進(jìn)行對(duì)比研究。研究發(fā)現(xiàn)，GPC-NZ30K合金晶粒大體呈正態(tài)分布，平均晶粒較細(xì)小 (60 μm)；GSC-NZ30K合金晶粒分布偏離正態(tài)分布，晶粒尺寸大小不均勻且平均晶粒較粗大 (70 μm)。晶粒細(xì)小均勻的顯微組織 (GPC-NZ30K-T6合金) 可以明顯提高合金的室溫拉伸性能，包括屈服強(qiáng)度 (+6.6 MPa)、抗拉強(qiáng)度 (+43 MPa)和延伸率 (+2.8%)，但對(duì)于提高合金的室溫拉壓疲勞強(qiáng)度 (+1.12 MPa) 作用不明顯；平均晶粒略粗大且大小分布不均勻的顯微組織 (GSC-NZ30K-T6合金) 可使NZ30K-T6合金的疲勞性能穩(wěn)定。

    Abstract:

    The optical microstructure, mechanical properties and high cycle tension-compression fatigue properties (R= –1) at room temperature of gravity permanent cast (GPC) and gravity sand cast (GSC) Mg-3Nd-0.2Zn-Zr (NZ30K) (wt.%) magnesium alloy were studied. Results show that GPC-NZ30K alloy has normal grain size distribution generally, with relatively fine grains, about 60 μm, while GSC-NZ30K alloy has non-uniform grain size distribution, with relatively coarse grains, about 70 μm. Finer grains in GPC-NZ30K-T6 alloy lead to higher yield strength (+6.6 MPa), higher ultimate tensile strength (+43 MPa) and higher elongation (+2.8%). However, it has a little influence on fatigue strength (+1.12 MPa). Coarse and non-uniform grain size distribution in GSC-NZ30K-T6 alloy is favor to minimize the fatigue variation of cast NZ30K-T6 alloy.

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李智峰,李貞明,付彭懷,彭立明,王迎新.重力鑄造Mg-3Nd-0.2Zn-Zr鎂合金高周疲勞行為的研究[J].稀有金屬材料與工程,2012,41(9):1592~1596.[Li Zhifeng, Li Zhenming, Fu Penghuai, Peng Liming, Wang Yingxin. Study on High Cycle Fatigue Behavior of Gravity Cast Mg-3Nd-0.2Zn-Zr Magnesium Alloy[J]. Rare Metal Materials and Engineering,2012,41(9):1592~1596.]
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  • 收稿日期:2011-09-21
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