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超細(xì)晶反擠壓Mg-8Sn-1Al-1Zn合金的組織和性能
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山西省青年科技基金 (2013021013-4)；山西省留學(xué)回國(guó)人員擇優(yōu)資助項(xiàng)目 (2013-68)


Microstructure and Mechanical Properties of Indirect-Extruded Mg-8Sn-1Al-1Zn Alloy with Ultrafine Grained Structure
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    摘要:

    采用OM、SEM、XRD、EBSD、TEM和電子材料試驗(yàn)機(jī)等手段研究了超細(xì)晶反擠壓Mg-8%Sn-1Al-1Zn(質(zhì)量分?jǐn)?shù))合金的組織和力學(xué)性能。結(jié)果表明：在250 ℃下，通過反擠壓可以制備出具有超細(xì)晶組織的高強(qiáng)度Mg-8Sn-1Al-1Zn合金。在反擠壓過程中，大部分粗大晶粒均通過動(dòng)態(tài)再結(jié)晶轉(zhuǎn)變?yōu)榧?xì)小的等軸晶，其平均晶粒尺寸為1.92 μm。另外，合金中存在大量的微米和納米級(jí)Mg2Sn顆粒相。反擠壓合金表現(xiàn)出典型的基面纖維織構(gòu)。上述組織特征是動(dòng)態(tài)再結(jié)晶、孿晶和第二相共同作用的結(jié)果。合金的室溫抗拉屈服強(qiáng)度和壓縮屈服強(qiáng)度分別為285 和260 MPa，合金的拉伸/壓縮屈服點(diǎn)比率R高達(dá)0.91。合金的高強(qiáng)度和高R值主要?dú)w因于合金的細(xì)晶組織以及彌散分布的微納米級(jí)第二相

    Abstract:

    The microstructure evolution and mechanical properties of indirect-extruded Mg-8Sn-1Al-1Zn have been investigated by OM, SEM, XRD, EBSD, TEM and a stand universal testing machine. The results indicate that the high strength Mg-8Sn-1Al-1Zn alloy with ultrafine grained structure can be successfully fabricated by indirect extrusion at 250 oC. During the extrusion process, most of the coarse grains were changed into fine equiaxed grains with average sizes of 1.92 μm. In addition, some nano-sized particles were observed by TEM in the alloy. The extruded alloy reveals a type of fiber texture in which basal poles are preferentially perpendicular to the ED. The formation of the ultra-fine grained structure was ascribed to the dynamic recrystallization and second phase. The tensile yield strength and compressive yield strength of the extruded alloys are 285 and 260 MPa, respectively. The R value of the alloy equals to 0.91. The superior strength and low yield asymmetry are mainly related to the fine-grained structure and dispersive fine second phase particles

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程偉麗,霍 瑞,陸楊婕,You Bong-sun, Park Sung-soo.超細(xì)晶反擠壓Mg-8Sn-1Al-1Zn合金的組織和性能[J].稀有金屬材料與工程,2014,43(11):2824~2828.[Cheng Weili, Huo Rui, Lu Yangjie, You Bong-sun, Park Sung-soo. Microstructure and Mechanical Properties of Indirect-Extruded Mg-8Sn-1Al-1Zn Alloy with Ultrafine Grained Structure[J]. Rare Metal Materials and Engineering,2014,43(11):2824~2828.]
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  • 收稿日期:2013-11-18
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  • 在線發(fā)布日期: 2015-04-07
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