文章信息/Info

Title:

Research Progress on Ultra�睭igh Strength and Toughness Mg-Gd-Y-Zn-Zr Wrought Magnesium Alloys

文章編號:

1674-3962(2020)01-0019-12

作者:

鄭明毅; 徐超; 喬曉光; 孫婉婷; 池元清

（哈爾濱工業大學材料科學與工程學院，黑龍江，哈爾濱，150001）

Author(s):

ZHENG Mingyi;  XU Chao. QIAO Xiaoguang;  SUN Wanting;  CHI Yuanqing

(School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

關鍵詞:

超高強鎂合金; 稀土; 顯微組織; 強韌化; 變形鎂合金

Keywords:

ultrahigh strength Mg alloys;  rare earth;  wrought Mg alloys;  microstructure;  strengthening and toughening

分類號:

TG146.22

DOI:

10.7502/j.issn.1674-3962.201908036

文獻標志碼:

A

摘要:

超高強韌鎂合金的研發對推廣鎂合金在高技術領域的應用具有重要意義。鎂與稀土均是我國的優勢資源，因此在我國發展超高強韌稀土鎂合金具有得天獨厚的優勢，其中Mg-Gd-Y-Zn-Zr系變形鎂合金因其接近高強鋁合金的超高強度和塑性，近年來受到研究者的廣泛關注。綜述了超高強韌Mg-Gd-Y-Zn-Zr系變形鎂合金的合金成分、常規塑性變形工藝、新型劇烈塑性變形工藝和熱處理工藝對該合金顯微組織和力學性能的影響規律，以及該超高強韌變形鎂合金的顯微組織特征和強韌化機理。T5峰時效態超高強韌Mg-8-2Gd-3-8Y-1Zn-0-4Zr（質量分數）擠壓合金具有雙峰分布的晶粒尺寸“軟-硬”復合層片微結構，以及由高密度的基面γ′納米片狀析出相和棱柱面β′納米析出相形成的近連續網狀結構，該擠壓合金室溫拉伸屈服強度、拉伸強度和斷裂延伸率分別為466 MPa、514 MPa和14.5％。介紹了哈爾濱工業大學等單位在超高強韌Mg-Gd-Y-Zn-Zr系變形鎂合金的規模化制備和應用方面的研究進展，并展望了Mg-Gd-Y-Zn-Zr系變形鎂合金的發展趨勢。

Abstract:

The research and development of ultra-high strength and toughness magnesium alloys is of great significance to promote the application of magnesium alloys in high-tech industries. Magnesium and rare earth are the advantageous resources in China. The development of magnesium-rare earth (Mg-RE) alloys with ultra-high strength and toughness has unique advantages in China. Among them, Mg-Gd-Y-Zn-Zr wrought magnesium alloys can obtain ultra-high strength and ductility close to high-strength aluminum alloys, which have received great attention in recent years. In this paper, the effects of alloy composition, conventional plastic deformation processes, novel severe plastic deformation processes and heat treatment processes on the microstructure and mechanical properties of ultra-high strength and toughness Mg-Gd-Y-Zn-Zr wrought magnesium alloys are reviewed. The microstructure features, strengthening and toughening mechanisms of the Mg-Gd-Y-Zn-Zr wrought magnesium alloys with ultra-high strength and toughness are also discussed. The T5 peak-aging treated Mg-8-2Gd-3-8Y-1Zn-0-4Zr (mass fraction) extrusion alloy with ultra-high strength and toughness exhibits a “soft-hard” composite layered microstructure with bimodal grain sizes, and a near-continuous networks formed by precipitation of dense nanoscale basal and prismatic precipitates. The Mg-8-2Gd-3-8Y-1Zn-0-4Zr extrusion alloy obtains a tensile yield strength of 466 MPa, ultimate tensile strength of 514 MPa and elongation to failure of 14��5%. This paper also introduces the research progress of Harbin Institute of Technology and other groups in the large�瞫cale fabrication and application of ultra�瞙igh strength and toughness Mg-Gd-Y-Zn-Zr wrought magnesium alloys, and the research trends on Mg-Gd-Y-Zn-Zr wrought alloys with ultra-high strength and toughness are also prospected.