通过金属模铸、热挤压和时效处理(T5)工艺过程制备出高强Mg-7Gd-4Y-1.6Zn-0.5Zr合金,并利用光学显微镜、XRD、SEM及TEM分析研究Mg合金不同状态下的显微组织和力学性能.结果表明:Mg-7Gd-4Y-1.6Zn-0.5Zr合金的铸态组织主要由a-Mg基体和沿晶界分布的片层状第二相Mg12Zn(Gd,Y)组成,经过热挤压变形后,合金晶粒显著细化,时效处理过程中Mg12Zn(Gd,Y)相上析出少量细小的颗粒状Mg3Zn3(Gd,Y)2相.时效态合金的抗拉强度、屈服强度和伸长率分别达到446 MPa、399 MPa和6.1％,其强化方式主要为细晶强化和第二相强化.
参考文献
| [1] | 陈振华.镁合金[M].北京:化学工业出版社,2004 |
| [2] | 王宏伟,易丹青,王斌,蔡金伶,钱锋,陈缇萦.Mg-6.3Zn-0.7Zr-0.9Y-0.3Nd镁合金的高温塑性变形行为的热压缩模拟[J].中国有色金属学报,2010(03):378-384. |
| [3] | 刘楚明,李冰峰,王荣,李慧中,陈志永.二次挤压对Mg-12Gd-3Y-0.6Zr合金显微组织及力学性能的影响[J].中国有色金属学报,2010(02):171-176. |
| [4] | 张磊,董选普,李继强,王爱华,罗可,樊自田.Mg-15Gd-3Y挤压合金的时效强化[J].中国有色金属学报,2010(04):599-605. |
| [5] | KIRYUU M;OKUMURA H;KAMADO S;KOJMA Y NINMIYA R NAKATSUGAWA I .Corrosion resistance of heat resistant magnesium alloys containing heavy rare earth elements[J].Japan Institute of Light Metal,1996,46(01):39-44. |
| [6] | PENG Q M;WU Y M;FANG D Q;MENG J WANG L M .Mierostructures and properties of Mg-7Gd alloy containing Y[J].Journal of Alloys and Compounds,2007,430:252-256. |
| [7] | ROKHLIN L L.Magnesium alloys containing rare earth metals[M].London:taylor and Francis,2003 |
| [8] | KAMADO S;IWASAWA S;OHUCHI K;KOJIMA Y NINOMIYA R .Aging hardening characteristics and high temperature strength of Mg-Gd and Mg-Tb alloys[J].Japanese Journal of Institute of Light Metals,1992,42(12):727-733. |
| [9] | KAWAMURA Y;HAYASHI K;INOUE A;MASUMOTO T .Rapidly solidified powder metallurgy Mg97ZnlY2 alloys with excellent tensile yield strength above 600 MPa[J].Materials Transactions,2001,42(07):1172-1176. |
| [10] | GAO Yan;WANG Qudong;GU Jinhai .Effects of heat treatments on microstructure and mechanical properties of Mg-15Gd-5Y-0.5Zr alloy[J].Journal of Rare Earths,2008(2):298-302. |
| [11] | 彭卓凯,张新明,陈健美,肖阳,蒋浩,邓桢桢.Mn,Zr对Mg-Gd-Y合金组织与力学性能的影响[J].中国有色金属学报,2005(06):917-922. |
| [12] | Michiaki Yamasaki;Tsutomu Anan;Shintaro Yoshimoto .Mechanical properties of warm-extruded Mg-Zn-Gd alloy with coherent 14H long periodic stacking ordered structure precipitate[J].Scripta materialia,2005(7):799-803. |
| [13] | KAWAMURA Y;YAMASAKI M .Formation and mechanical properties of Mg97ZnlRE2 alloys with long-period stacking ordered structure[J].Materials Transactions,2007,48(11):2986-2992. |
| [14] | ITOI T;SEIMIYA T;KAWAMURA Y;HIROHASHI M .Long period stacking structures observed in Mg97ZnlY2 alloy[J].Scripta Materialia,2004,51:107-111. |
| [15] | NUSSBAUM G;SAINFORT P;REGAZZONI G;GJESTLAND H .Strengthening mechanisms in the rapidly solidified AZ91 magnesium alloy[J].Seripta Metallurgica,1989,23:1079-1084. |
| [16] | ABE E;KAW AMURA Y;HAYASHI K;INOUE A .Long-period ordered structure in a high-strength nanocrystalline Mg-1at%Zn2at%Y alloy studied by atomic-resolution Z-contrast STEM[J].Scripta Materialia,2002,50:3845-3857. |
| [17] | POTER D A;EASTERING K E.Phase transformations in metals and alloys[M].London:Chapman and Hall,1992:387. |
| [18] | WANG Bai-shu,XIONG Shou-mei,LIU Yong-bing.Tensile fracture of as-cast and hot rolled Mg-Zn-Y alloy with long-period stacking phase[J].中国有色金属学报（英文版）,2010(z2):488-492. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%