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遠(yuǎn)離平衡態(tài)下鎂合金表面激光重熔強(qiáng)化的研究
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太原理工大學(xué),太原理工大學(xué),太原理工大學(xué),太原理工大學(xué)

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中圖分類號:

TG146

基金項目:

國家自然科學(xué)基金項目（面上項目，重點(diǎn)項目，重大項目）


Laser Surface Melting and Strengthening Magnesium Alloy Far from Equilibrium
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Taiyuan University of Technology,Taiyuan University of Technology,Taiyuan University of Technology,Taiyuan University of Technology

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    摘要:

    為了在鎂合金表面獲得遠(yuǎn)離平衡態(tài)的極端快速冷卻結(jié)構(gòu)，對AZ31B鎂合金進(jìn)行了在液氮環(huán)境下極端快速冷卻的CO2激光表面重熔處理，并對該重熔層的微觀結(jié)構(gòu)、性能和強(qiáng)化機(jī)制進(jìn)行了分析研究。研究結(jié)果表明：遠(yuǎn)離平衡態(tài)結(jié)晶凝固的鎂合金表面重熔層的晶粒高度細(xì)化，且晶粒大小基本均一。重熔層主要為α-Mg，以及沿晶界析出的極少量β-Mg17Al12。極端快速冷卻條件獲得的遠(yuǎn)離平衡態(tài)的重熔層的強(qiáng)化機(jī)制主要為細(xì)晶強(qiáng)化、超固溶強(qiáng)化和位錯強(qiáng)化。在此強(qiáng)化作用下重熔層的顯微硬度提高到140HV，磨損失量比空氣冷卻條件下的少50%，耐磨性顯著提高。該重熔層的沖擊斷口特征顯示出了塑性變形的痕跡，故該鎂合金表面的塑性和韌性也得到了改善。

    Abstract:

    In order to obtain extremely rapid solidification structure far from equilibrium, the surface of AZ31B magnesium alloy was melted by CO2 laser, while the samples were extremely rapidly cooled in liquid nitrogen. Microstructure, performance and strengthening mechanism of laser melted layer were investigated. The results showed that grains of melted layer were highly refined and grain size was nearly uniform. The melted layer contained α-Mg and β-Mg17Al12, but β-Mg17Al12 which distributed along grain boundary was few. Because of strengthening mechanisms of fined grains, super solid solution and dislocation, microhardness of melted layer was up to 140HV. Wear loss of melted sample cooled in liquid nitrogen was about 50% less than that of the untreated sample and melted sample cooled in air, and wear resistance of melted layer was improved obviously. Impacting fracture morphology indicated that there was trace of plastic deformation, thus, plasticity and ductility were also improved.

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葛亞瓊,王文先,郭謖,崔澤琴.遠(yuǎn)離平衡態(tài)下鎂合金表面激光重熔強(qiáng)化的研究[J].稀有金屬材料與工程,2016,45(8):1949~1955.[ge ya qiong, wang wen xian, guo su, cui ze qin. Laser Surface Melting and Strengthening Magnesium Alloy Far from Equilibrium[J]. Rare Metal Materials and Engineering,2016,45(8):1949~1955.]
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歷史
  • 收稿日期:2014-06-13
  • 最后修改日期:2014-07-23
  • 錄用日期:2014-08-12
  • 在線發(fā)布日期: 2016-10-09
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