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高強Mg-Gd-Y-Zn-Zr合金的微觀組織和力學性能
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-09-19
通過金屬模鑄、熱擠壓和時效處理(T5)工藝過程制備出高強Mg-7Gd-4Y-1.6Zn-0.5Zr合金，并利用光學顯微鏡、XRD、SEM及TEM分析研究Mg合金不同狀態下的顯微組織和力學性能。
高強Mg-Gd-Y-Zn-Zr合金的微觀組織和力學性能Microstructures and mechanical properties of?high-strength Mg-Gd-Y-Zn-Zr alloy
通過金屬模鑄、熱擠壓和時效處理(T5)工藝過程制備出高強Mg-7Gd-4Y-1.6Zn-0.5Zr合金，并利用光學顯微鏡、XRD、SEM及TEM分析研究Mg合金不同狀態下的顯微組織和力學性能。結果表明：Mg-7Gd-4Y-1.6Zn-0.5Zr合金的鑄態組織主要由α-Mg基體和沿晶界分布的片層狀第二相Mg12Zn(Gd, Y)組成，經過熱擠壓變形后，合金晶粒顯著細化，時效處理過程中Mg12Zn(Gd, Y)相上析出少量細小的顆粒狀Mg3Zn3(Gd, Y)2相。時效態合金的抗拉強度、屈服強度和伸長率分別達到446 MPa、399 MPa和6.1%，其強化方式主要為細晶強化和第二相強化。
High-strength Mg-7Gd-4Y-1.6Zn-0.5Zr alloy was prepared by conventional metal mold casting，subsequently hot extrusion and T5 heat treatment were conducted. The microstructures and mechanical properties of this Mg alloy under different states were studied by using OP, XRD, SEM and TEM. The results show that the as-cast microstructures of Mg-7Gd-4Y-1.6Zn-0.5Zr alloy consists of α-Mg matrix and lamellar second-phase Mg12Zn(Gd, Y) phase which distributes around α-Mg matrix. After hot extrusion, the grain size of this alloy can be refined dramatically. Tiny little particle Mg3Zn3(Gd, Y)2?phase is precipitated out of the Mg12Zn(Gd, Y) phase during the process of T5 heat treatment. The tensile strength, yield strength and elongation of alloys under T5 condition reach 446 MPa, 399 MPa and 6.1%, respectively. The main strengthening methods are considered as fine grain strengthening and second-phase strengthening.
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