研究了Be和Ca元素对Mg-9Al-0.5Zn合金显微组织和力学性能的影响。结果表明：在Mg-9Al-0.5Zn镁合金中添加0.1Be导致合金组织粗化和力学性能下降，同时在晶粒内部形成粒状γ相(Mg17Al12)。在此基础上添加Ca可以使合金组织细化，且含量越高，细化效果越明显。Mg-9Al-0.5Zn-0.1Be-0.5Ca合金具有较高的综合力学性能，但是进一步增加Ca含量导致合金常温力学性能下降。由于A12Ca相良好的高温强化作用，因此当Ca含量小于1％时，Mg-9Al-0.5Zn-0.1Be-XCa合金具有较高的高温强度，进一步增加Ca含量会增大合金脆性。
Be and Ca were added to Mg-9Al-0. 5Zn alloy to study the microstructure and mechanical propertes. After the addition of 0. 1% Be in Mg-9Al-0. 5Zn alloy, the grain size increased, mechanical properties declined and some nodular γ phases formed within the grains. Ca was added to Mg-9Al-0. 5Zn-0. 1Be alloy to refine the grains and results indicated that the grain size was inversely proportional to Ca addition. Small addition of Ca could increase the mechanical propertes, but more Ca addition would decrease the mechanical propeties. Because of the excellent strengthening effect Al2Ca, less than lwt% Ca addition in Mg-9Al-0. 5Zn-0. 1Be-XCa increased the elevated temperature strength remarkably, but too much Ca addition would make the alloy brittle.
参考文献
| [1] | Robert E Brown.53rd Annual morld magnesium conference[J].Light Metal Age,1996(08):50-60. |
| [2] | 陈力禾;赵慧杰;刘正;申志勇.镁合金压铸及其在汽车工业中的应用[J].铸造,1999(10):45-49. |
| [3] | Fruehling J W;Hanawalt J D .Protective Atmospheres for melting magnesium alloys[J].AFS Transactions,1996,77:59. |
| [4] | Sakamoto M;Akiyama s .Supperssion of ignition and burning of molten Mg alloy by Ca-bearing stable oxide film[J].Journal of Materials Science Letters,1997,16:1048. |
| [5] | Sakamoto M.Mechanism of Non-combustibility and Ignition of Ca-bearing Mg Melt[A].,1996:380. |
| [6] | 陆树荪.有色铸造合金及熔炼[M].北京:国防工业出版社,1983 |
| [7] | NINOMIYA R;Ojiro T;Kubota K .Improved Heat Resistance of Mg-Al Alloy by the Ca Addition[J].Acta Metallurgica Et Materialia,1995,43(02):669-674. |
| [8] | Shaw C;Jones H.Effect of Rapid Solidification and Subsequent Heat Treatment on the Structure and Properties of Melt-Spun Mg-Al-Ca Alloys[A].,1997:481-494. |
| [9] | Murray J L .The Al-Mg system[J].Bulletin of Alloy Phase Diagrams,1982,3(03):60-74. |
| [10] | ItkinVP;Alcock C B;Van P J et al.[J].Bulletin of Alloy Phase Diagrams,1988,9(06):652-657. |
| [11] | Nayeb-hashemi A A;Clark J B .[J].Bulletin of Alloy Phase Digarams,1987,8(01):58-65. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%