將 Zn 和 Y 元素以原子比為 6:1 的形式加入 AM50 合金中, 并采用金屬型鑄造成形, 利用 OM, SEM, EDS, XRD, 熱分析法及拉伸實(shí)驗(yàn)研究了 AM50-x(Zn, Y) (x=0, 2, 3, 4, 5, 質(zhì)量分?jǐn)?shù), %)合金的顯微組織、凝固行為及力學(xué)性能. 結(jié)果表明: 向 AM50 合金中按原子比為 6 的形式加入 Zn 和 Y元素后, 組織得到明顯細(xì)化, 組織中并未形成 Mg3Zn6Y 準(zhǔn)晶相, 而形成了顆粒狀的 Al6YMn6相和細(xì)小的 Al2Y 相, 其中 Al6YMn6相尺寸隨著 Zn 和 Y元素含量的增加而增大; 當(dāng) x≥3 時(shí), 在組織中 β 相的周圍逐漸形成層片狀的 Φ-Mg21(Zn, Al)17相, 且其數(shù)量逐漸增加. 熱分析結(jié)果表明, Φ-Mg21(Zn,?Al)17相約在 354 ℃通過包晶反應(yīng)形成, 其中 α-Mg 和 β 相析出溫度隨著 x 的增加而降低. 由于 Al6YMn6相、Al2Y 相和 Φ-Mg21(Zn, Al)17相的形成, 使得 β 相的尺寸減小、數(shù)量減少; 當(dāng) x=4 時(shí), 合金組織最為細(xì)小, 且合金力學(xué)性能達(dá)到最優(yōu), 其抗拉強(qiáng)度、屈服強(qiáng)度和伸長率分別為 206.63 MPa, 92.50?MPa 和 10.04%.
As the lightest metallic structural material, magnesium alloys were widely used in automotive,?aerospace, electronic equipment and other fields. Among commercial magnesium alloys, AM series were?commonly used due to excellent ductility and energy absorption. However, their relatively poor strength greatly?restricted their extended use. In order to improve mechanical properties of AM50 alloy, the Zn and Y elements?were added into the AM50 alloy in the form of atomic ratio of 6:1 by the permanent mold casting. The?microstructure, solidification behavior and mechanical properties of AM50-x(Zn, Y) (x=0, 2, 3, 4, 5, mass?fraction, %) alloys were investigated by OM, SEM, EDS, XRD, thermal analysis and tensile tests. The results?indicated that addition of Zn and Y elements with an atomic ratio of 6:1 to AM50 alloy, the microstructures were?obviously refined, and the quasicrystal I-Phases (Mg3Zn6Y) cannot form. In addition, the granular Al6YMn6 phase?and fine Al2Y phase were formed in the microstructure, and the size of Al6YMn6 phase increased with increasing?the Zn and Y content. The Φ-Mg21(Zn, Al)17 phase with lamellar structure was formed around β phase when x≥3,?and its amount increased with increasing the Zn and Y addition. Thermal analysis results show that the Φ-Mg21(Zn,?Al)17 phase was formed at 354 ℃ by the peritectic reaction, in which the precipitation temperatures of α-Mg and β?phase were decreased with the increase of x content. Due to the formation of Al6YMn6, Al2Y and Φ-Mg21(Zn,?Al)17 phases, the size and amount of the β phase was decreased. For AM50-4 (Zn, Y) alloy, the microstructure was?greatly refined, and the ultimate tensile strength, yield strength and elongation of the alloy reached to the?maximum, 206.63 MPa, 92.50 MPa and 10.04%, respectively.
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