發(fā)布時(shí)間：2018-03-30 15:55

  本文選題：超聲沖擊　切入點(diǎn)：MB鎂合金　出處：《稀有金屬材料與工程》2017年07期

【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。采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180μm,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)間的延長而提高。與未沖擊試樣相比,在沖擊時(shí)間為6 min時(shí),沖擊電流為1.2 A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 magnesium alloy was treated with HJ-III ultrasonic impact equipment. The microstructure and grain refinement mechanism of ultrasonic impact surface layer were studied by high power transmission electron microscope (TEM). The wear resistance of MB8 magnesium alloy treated by ultrasonic impact treatment and non-impact treatment was compared and studied. Scanning electrolysis was used to study the wear resistance of MB8 magnesium alloy. The effects of ultrasonic impact treatment on the morphology and microhardness of worn surface were studied by mirror and microhardness tester respectively. The results showed that ultrasonic impact caused severe plastic deformation on the surface of MB8 magnesium alloy. The depth of the plasticized layer is about 180 渭 m, and the surface structure is obviously refined. The wear resistance and microhardness increase with the prolongation of the ultrasonic impact time. Compared with the non-impact specimen, the impact current is 1.2A when the impact time is 6 min. The microhardness and wear resistance of impact samples were increased by 102.8% and 51.833%, respectively.
【作者單位】： 華東交通大學(xué);載運(yùn)工具與裝備教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：National Natural Science Foundation of China(51265013) Natural Science Foundation of Jiangxi Province(20151BAB206007)
【分類號(hào)】：TG146.22;TG663

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本文編號(hào)：1686588