7Zn3轉(zhuǎn)變?yōu)镸g3Zn3Y2，最終轉(zhuǎn)變?yōu)镸g12ZnY。Y元素的加入阻礙了動(dòng)態(tài)再結(jié)晶的生長(zhǎng)過(guò)程，使晶粒得到細(xì)化，但是進(jìn)一步增加Y含量不會(huì)繼續(xù)增強(qiáng)晶粒細(xì)化程度。擠壓態(tài)Mg-2Zn-1Mn合金加入Y元素后，塑性呈現(xiàn)出先升高后下降的趨勢(shì)，這可能是受到了織構(gòu)取向變化和晶粒粗化的共同影響。此外，合金強(qiáng)度提高主要是由于細(xì)晶強(qiáng)化和第二相強(qiáng)化作用。Mg-2Zn-1Mn-7Y合金具有最佳的力學(xué)性能，其抗拉伸強(qiáng)度為357 MPa，屈服強(qiáng)度為262 MPa，延伸率為14%。"/>

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高Y添加量對(duì)Mg-2Zn-1Mn合金組織和力學(xué)性能的影響
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作者單位:

1.重慶大學(xué) 材料科學(xué)與工程學(xué)院，重慶 400045;2.重慶大學(xué) 國(guó)家鎂合金材料工程技術(shù)研究中心，重慶 400044;3.嘉興學(xué)院 信息科學(xué)與工程學(xué)院，浙江 嘉興 314001

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基金項(xiàng)目:

National Key Research and Development Program of China (2019YFC1520303); Natural Science Foundation of Zhejiang Province (LQ18E010003); Chongqing Science and Technology Commission (cstc2019jscx-mbdxX0031).


Effect of High Y Addition on Microstructure and Mechanical Properties of Mg-2Zn-1Mn Alloy
Author:
Affiliation:

1.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;2.National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing University, Chongqing 400044, China;3.College of Information Science and Engineering, Jiaxing University, Jiaxing 314001 China

Fund Project:

National Key Research and Development Program of China (2019YFC1520303); Natural Science Foundation of Zhejiang Province (LQ18E010003); Chongqing Science and Technology Commission (cstc2019jscx-mbdxX0031)

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    摘要:

    采用光學(xué)顯微鏡、X射線衍射儀、X射線熒光法、電子探針顯微分析儀、掃描電子顯微鏡、電子背散射衍射、透射電子顯微鏡和單軸拉伸測(cè)試等對(duì)Mg-2Zn-1Mn-xY (x=0，1，3，5，7，質(zhì)量分?jǐn)?shù)，%)合金的顯微組織和力學(xué)性能進(jìn)行研究。結(jié)果表明：隨著Y元素的加入，鑄態(tài)合金的第二相由Mg7Zn3轉(zhuǎn)變?yōu)镸g3Zn3Y2，最終轉(zhuǎn)變?yōu)镸g12ZnY。Y元素的加入阻礙了動(dòng)態(tài)再結(jié)晶的生長(zhǎng)過(guò)程，使晶粒得到細(xì)化，但是進(jìn)一步增加Y含量不會(huì)繼續(xù)增強(qiáng)晶粒細(xì)化程度。擠壓態(tài)Mg-2Zn-1Mn合金加入Y元素后，塑性呈現(xiàn)出先升高后下降的趨勢(shì)，這可能是受到了織構(gòu)取向變化和晶粒粗化的共同影響。此外，合金強(qiáng)度提高主要是由于細(xì)晶強(qiáng)化和第二相強(qiáng)化作用。Mg-2Zn-1Mn-7Y合金具有最佳的力學(xué)性能，其抗拉伸強(qiáng)度為357 MPa，屈服強(qiáng)度為262 MPa，延伸率為14%。

    Abstract:

    The microstructure and mechanical properties of Mg-2Zn-1Mn-xY (x=0, 1, 3, 5, 7, wt%) alloy were studied by optical microscope (OM), X-ray diffractometer (XRD), X-ray fluorescence spectrometer (XRF), electron probe microanalyzer (EPMA), scanning electron microscope (SEM), electron backscatter diffractometer (EBSD), transmission electron microscope (TEM), and uniaxial tensile tests. Results show that the secondary phases of as-cast alloys are changed from Mg7Zn3 to Mg3Zn3Y2 and finally transformed to Mg12ZnY with the addition of Y element. Although Y addition hinders the dynamic recrystallization process and therefore refines the grains, the excess Y addition cannot further refine the grains. Meanwhile, the ductility of as-extruded Mg-2Zn-1Mn alloy is increased and then decreased with the addition of Y element, which may be attributed to the synergistic effect of texture orientation and grain coarsening. Besides, the strength enhancement is mainly attributed to grain refinement strengthening and secondary phase strengthening. The Mg-2Zn-1Mn-7Y alloy has the optimal mechanical properties: the ultimate tensile strength is 357 MPa, yield strength is 262 MPa, and elongation is 14%.

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羅宇倫,張丁非,華建榮,代啟敏,鐘詩(shī)宇,胥鈞耀,胡光山,蔣斌,潘復(fù)生.高Y添加量對(duì)Mg-2Zn-1Mn合金組織和力學(xué)性能的影響[J].稀有金屬材料與工程,2023,52(1):54~62.[Luo Yulun, Zhang Dingfei, Hua Jianrong, Dai Qimin, Zhong Shiyu, Xu Junyao, Hu Guangshan, Jiang Bin, Pan Fusheng. Effect of High Y Addition on Microstructure and Mechanical Properties of Mg-2Zn-1Mn Alloy[J]. Rare Metal Materials and Engineering,2023,52(1):54~62.]
DOI：10.12442/j. issn.1002-185X.20220172

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  • 收稿日期:2022-03-05
  • 最后修改日期:2022-09-04
  • 錄用日期:2022-09-27
  • 在線發(fā)布日期: 2023-02-09
  • 出版日期: 2023-02-08