Mg-9Al-1Mn合金热轧板材组织与性能

Microstructure and Properties of Mg-9Al-1Mn Alloy Sheets Processed by Hot Rolling

中文关键词: Mg-9Al-1Mn (AM91)合金 单道次大应变热轧 多道次小应变热轧 组织 性能 各向异性

英文关键词: Mg-9Al-1Mn (AM91) alloy, single pass large strain hot rolling (LSR), small variable multi pass hot rolling (SSR), microstructure, properties, In-plane Anisotropy (IPA)

中文摘要:

      研究了经单道次大应变热轧(LSR)和多道次小应变热轧(SSR)两种不同的轧制工艺下3 mm的Mg-9Al-1Mn(AM91)挤压板的组织和性能。通过拉伸试验对两种工艺制备的板材的力学性能进行测定,并利用X射线衍射仪(XRD)、光学显微镜以及背散射电子衍射(EBSD)分析等方法对两种工艺制备的板材的微观组织进行观察和分析。研究结果表明:相比于SSR轧制态板材,LSR轧态及退火态的板材组织都得到了细化,织构也都得到了弱化,塑性变形能力得到了明显的改善。经LSR轧态的板材的断裂延伸率(FE)为20.5%,屈服强度(YS)为193 MPa,抗拉强度(UTS)为284 MPa。LSR工艺可显著改善板材的各向异性,SSR板材退火后的各向异性值(IPA)为8.8%,LSR板材退火后的IPA为5.0%。

英文摘要:

      In this paper, the microstructure and mechanical properties of Mg-9Al-1Mn (AM91) alloy sheets, which processed by hot extrusion in 3 mm followed by single pass large strain hot rolling (LSR) and multi pass small strain hot rolling (SSR) were investigated. And the microstructure and properties of the sheets were examined by X-ray diffraction (XRD), optical microscope, electron back scatter diffraction (EBSD) and tensile test, respectively. The results showed that, compared with the SSR method, the finer grains and more weaken texture could be achieved via using the LSR method in the as-extruded AM91 alloy. Moreover, compared with the SSR sheet, the yield strength (YS), ultimate tensile strength (UTS) and fracture elongation (FE) of LSR AM91 sheet were 193 MPa, 284 MPa and 20.5%, respectively. The plastic deformation capacity had been significantly improved. The mechanical anisotropy of the as-extruded sheet can be improved obviously by LSR method. The In-plane Anisotropy (IPA) of SSR and LSR AM91 sheet after annealing were 5% and 8.8%, respectively.