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超聲沖擊對(duì)MB8鎂合金耐磨性能及顯微硬度的影響
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華東交通大學(xué)機(jī)電工程學(xué)院,華東交通大學(xué),華東交通大學(xué)機(jī)電工程學(xué)院,華東交通大學(xué),華東交通大學(xué)機(jī)電工程學(xué)院

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TG

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國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Experimental research on micro-hardness and wear resistance of MB8 magnesium alloy treated by ultrasonic impact
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School of Mechanical Electrical Engineering,East China Jiaotong University,Nan’chang,Key Laboratory for Conveyance and Equipment,Ministry of Education,Nan’chang,School of Mechanical Electrical Engineering,East China Jiaotong University,Nan’chang,Key Laboratory for Conveyance and Equipment,Ministry of Education,Nan’chang,School of Mechanical Electrical Engineering,East China Jiaotong University,Nan’chang

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    摘要:

    采用HJ-III型超聲沖擊設(shè)備對(duì)MB8鎂合金表面進(jìn)行沖擊處理,利用高倍透射電子顯微鏡研究了超聲沖擊表層的微觀組織及晶粒細(xì)化機(jī)制。對(duì)經(jīng)超聲沖擊處理和未沖擊處理的MB8鎂合金的耐磨性能進(jìn)行了對(duì)比研究。用掃描電鏡和顯微硬度計(jì)分別研究了超聲沖擊處理對(duì)磨損表面形貌和顯微硬度的影響。結(jié)果表明：超聲沖擊使MB8鎂合金的表面出現(xiàn)了嚴(yán)重的塑性變形,塑變層深度約為180 μm,表面組織明顯得到細(xì)化。耐磨性能和顯微硬度隨超聲沖擊時(shí)間的延長(zhǎng)而提高。與未沖擊試樣相比,在沖擊時(shí)間為6分鐘時(shí),沖擊電流為1.2A時(shí),沖擊試樣的顯微硬度和耐磨性分別提高了102.8% 和51.83%。

    Abstract:

    The surface of MB8 wrought magnesium alloy was treated by HJ-III type ultrasonic impact treating (UIT) machine. The microstructures on the treated surface were analyzed by means of an optical microscope, and the grain refining mechanism of UIT was investigated by High Resolution Transmission Electron Microscopy (HRTEM). The wear resistance of MB8 wrought magnesium alloy was experimentally researched both with the treated and un-treated specimens respectively. The effect of UIT process on the microstructure, micro-hardness were also investigated using scanning electron microscope (SEM) and micro-hardness tester. The experimental results indicated that the grains on the top surfaces of MB8 were highly refined. The severe plastic deformation was formed by UIT, and the thickness of the plastic deformation layer was approximately 180 μm. The microhardness and wear resistance of the treated surface layer of MB8 could be enhanced significantly compared to that of the un-treated specimens. The longer the UIT time, the greater of the microhardness and wear resistance of the treated surface layer of MB8 would be. When the impact current is 1.2A and impact time is 6 min respectively, the microhardness and wear resistance of the treated sample is about 102.8% and 51.83% higher than that of the un-treated specimen, respectively.

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于影霞,何柏林,呂宗敏,雷思涌,夏崧崧.超聲沖擊對(duì)MB8鎂合金耐磨性能及顯微硬度的影響[J].稀有金屬材料與工程,2017,46(7):1798~1802.[Yu Yingxia, He Bolin, Lv Zongmin, Lei Siyong, Xia Songsong. Experimental research on micro-hardness and wear resistance of MB8 magnesium alloy treated by ultrasonic impact[J]. Rare Metal Materials and Engineering,2017,46(7):1798~1802.]
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  • 收稿日期:2015-05-22
  • 最后修改日期:2015-10-26
  • 錄用日期:2015-11-18
  • 在線(xiàn)發(fā)布日期: 2017-11-14
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