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LPSO堆垛結(jié)構(gòu)轉(zhuǎn)變對(duì)擠壓態(tài)Mg-2.0Zn-0.3Zr-5.8Y鎂合金組織性能的影響
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青島理工大學(xué)機(jī)械工程學(xué)院,重慶大學(xué)材料科學(xué)與工程學(xué)院,青島理工大學(xué)機(jī)械工程學(xué)院,青島理工大學(xué)機(jī)械工程學(xué)院

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國(guó)家“十二五”支撐計(jì)劃(2011BAE22B03-3)；科技部國(guó)際合作項(xiàng)目(2011DFA5090)


Effect of transformation of LPSO phase on microstructure and mechanical properties of extruded Mg-2.0Zn-0.3Zr-5.8Y alloy
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College of Mechanical Engineering,Qingdao Technological University,,College of Mechanical Engineering,Qingdao Technological University,College of Mechanical Engineering,Qingdao Technological University

Fund Project:

National Natural Science Foundation of China (60961001); Major State Basic Research Program of China (2010CB635112)

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    摘要:

    本文通過(guò)改變擠壓溫度以獲得含有不同堆垛結(jié)構(gòu)長(zhǎng)周期相（LPSO）的Mg-2.0Zn-0.3Zr-5.8Y合金，研究LPSO相堆垛結(jié)構(gòu)轉(zhuǎn)變對(duì)擠壓態(tài)合金組織性能的影響規(guī)律及其作用機(jī)制。研究結(jié)果表明：擠壓溫度為390℃，合金中有18R和14H 兩種堆垛結(jié)構(gòu)的LPSO相，其平均晶粒尺寸為9.5±3.0μm，合金的抗拉強(qiáng)度達(dá)到280MPa，延伸率為18.7%；當(dāng)變形溫度達(dá)到420℃，合金中18R LPSO相全部轉(zhuǎn)變?yōu)?4H結(jié)構(gòu)，平均晶粒尺寸大幅細(xì)化至3.1±1.1μm，合金的抗拉強(qiáng)度和延伸率均得到明顯提高，分別達(dá)到330MPa和20.8%；隨著擠壓溫度的進(jìn)一步提高，合金的平均晶粒尺寸逐漸變大，強(qiáng)度和延伸率開(kāi)始逐漸降低。由于LPSO相堆垛結(jié)構(gòu)轉(zhuǎn)變和晶粒尺寸變化引起基面織構(gòu)和柱面織構(gòu)的強(qiáng)度發(fā)生變化，LPSO相形態(tài)改變以及晶粒細(xì)化是Mg-2.0Zn-0.3Zr-5.8Y擠壓態(tài)合金室溫力學(xué)性能變化的主要因素。

    Abstract:

    In this study, effect and mechanism of different stacking structures of LPSO phase on microstructures and mechanical properties of Mg-2.0Zn-0.3Zr-5.8Y under different extrusion temperatures were studied. The results showed that the average grain size of the alloy containing 18R and 14H LPSO phases reached 9.5±3.0μm under the extrusion temperature of 390℃, and the tensile strength and elongation reached 280MPa and 18.7%, respectively. When the extrusion temperature increased to 420℃, the 18R LPSO phase transformed to 14H structure, the grain size was refined significantly, and the tensile strength and elongation increased to 330MPa and 20.8%, respectively. With the increasing of extrusion temperature (over 420℃), the grain size increased and the tensile strength and elongation decreased. The variation of texture intensity under different deformation temperatures, the transformation of stacking structure and shape of LPSO phase and grain refinement are the main reasons caused the variation of mechanical properties of extruded alloy.

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引用本文

呂濱江,彭建,梁鵬,王進(jìn). LPSO堆垛結(jié)構(gòu)轉(zhuǎn)變對(duì)擠壓態(tài)Mg-2.0Zn-0.3Zr-5.8Y鎂合金組織性能的影響[J].稀有金屬材料與工程,2016,45(11):2861~2866.[Bin-Jiang Lv, Jian Peng, Peng Liang, Jin Wang. Effect of transformation of LPSO phase on microstructure and mechanical properties of extruded Mg-2.0Zn-0.3Zr-5.8Y alloy[J]. Rare Metal Materials and Engineering,2016,45(11):2861~2866.]
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  • 收稿日期:2015-06-03
  • 最后修改日期:2015-09-22
  • 錄用日期:2015-10-13
  • 在線發(fā)布日期: 2016-12-08
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