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AZ91筒形件旋壓的組織衍化及微納力學(xué)性能
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1太原理工大學(xué)

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51375328)


Microstructure evolution and micro/nano mechanical properties of AZ91 magnesium alloy tube by spinning
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1.Taiyuan University of Technology

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    摘要:

    本文采用強(qiáng)力正旋的方式對(duì)AZ91鎂合金筒形件進(jìn)行多道次旋壓，通過光學(xué)顯微鏡(OM)和配有電子背散射衍射和能譜的掃描電子顯微鏡(SEM-EBSD-EDS)對(duì)不同旋壓道次的微觀組織衍化進(jìn)行觀察，結(jié)合EDS和X-Ray衍射儀（XRD）對(duì)筒形件的物相進(jìn)行分析，通過納米壓痕試驗(yàn)儀對(duì)不同旋壓道次鎂合金的微區(qū)力學(xué)性能進(jìn)行測(cè)試。研究結(jié)果表明：當(dāng)AZ91鎂合金筒形件的壁厚減薄率達(dá)到88.3%時(shí)，表面成形良好，無裂紋、褶皺產(chǎn)生；在旋壓的初期，主要為外壁鎂合金發(fā)生塑性變形，隨著旋壓變形量的增加，筒形件內(nèi)外壁鎂合金變形趨于一致，組織均勻，脆性相Mg17Al12發(fā)生破碎，呈流線形彌散地分布在鎂合金內(nèi)部，同時(shí)鎂合金晶粒也得到細(xì)化，并發(fā)生動(dòng)態(tài)再結(jié)晶；隨著變形量的增加，筒形件的強(qiáng)度提高，硬度最高可達(dá)1.036 GPa，強(qiáng)化方式主要為第二相彌散強(qiáng)化和細(xì)晶強(qiáng)化。

    Abstract:

    In this study, multi-pass spinning of AZ91 magnesium alloy tube was conducted by power forward spinning. The microstructural evolution, phaseStransformation and micro mechanical properties were examined by opticalSmicroscope, SEM-EBSD-EDS, and nano-indentation tests. The results show that when the wall thickness of AZ91 magnesium alloy tube reduced by 88.33%, the surface was well formed without cracks or folds. In the initial stage of spinning, plastic deformation mainly occurred on the outer surface of magnesium alloy. With the spinning deformation increased, the deformation of inner and outer surface tended to be consistent. The brittle phase Mg17Al12 broke down and distributed with a streamline shape in magnesium alloy. At the same time, the grain of magnesium alloy refined and dynamic recrystallization occurred. With the increase of deformation, the strength of tubular parts increased, and the hardness was up to 1.036 GPa. The strengthening modes mainly include second phase dispersion strengthening and fine grain strengthening.

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張媛琦,王文先,陳洪勝,曹曉卿,張婷婷,張宇陽(yáng). AZ91筒形件旋壓的組織衍化及微納力學(xué)性能[J].稀有金屬材料與工程,2019,48(2):580~586.[Zhang Yuanqi, Wang Wenxian, Chen Hongsheng, Cao Xiaoqing, Zhang Tingting, Zhang Yuyang. Microstructure evolution and micro/nano mechanical properties of AZ91 magnesium alloy tube by spinning[J]. Rare Metal Materials and Engineering,2019,48(2):580~586.]
DOI：10.12442/j. issn.1002-185X.20170600

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  • 收稿日期:2017-07-07
  • 最后修改日期:2017-09-05
  • 錄用日期:2017-09-12
  • 在線發(fā)布日期: 2019-03-15
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