AZ80鎂合金激光沖擊表面改性
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-05-06
采用預固溶或預時效+LSP形變+后時效處理方法，研究預固溶或預時效以及后時效處理對激光沖擊AZ80鎂合金組織參數(孿晶和析出相)的影響。
AZ80鎂合金激光沖擊表面改性Surface modification for AZ80 magnesium alloy by laser shock processing采用預固溶或預時效+LSP形變+后時效處理方法，研究預固溶或預時效以及后時效處理對激光沖擊AZ80鎂合金組織參數(孿晶和析出相)的影響。結果表明:預固溶+激光沖擊強化(LSP)形變處理使LSP強化層內產生高密度孿晶的形變帶，離沖擊表面越近，孿晶密度越高;經(170 ℃, 16 h)時效處理后，由于殘余壓應力熱穩定性，預固溶+LSP形變強化層仍產生具有高密度孿晶的形變帶;同時，彌散析出大量的顆粒狀β-Mg17Al12相，優先在應力集中的形變帶、孿晶界面和孿晶片層內析出;預時效析出的高密度β相極大地降低沖擊強化層孿生產生率，孿晶體積分數明顯降低，這是由于LSP誘導的高密度位錯和析出相引起的。
The effect of pre-solution, pre-aging and post-aging on microstructure parameters (twins and precipitates) of laser shocked AZ80 magnesium alloy was investigated by pre-solution or pre-aging+LSP deformation+post-aging. The results show that the deformation band with high density twins in the strengthened layer is produced by the treatment of pre-solution+laser shock processing(LSP) deformation, and the twins density increases with decrease of the distance to the impacted surface. The deformation band with high density twins is still produced by treatment of aging treatment for 16 h under the temperature of 170 ℃ due to the stability of the residual compressive stresses. At the same time, a large number of granular β-Mg17Al12?phases are dispersively and preferentially precipitated in the deformation band, the twin interface and the twin lamellae where the stress concentration exists. The ratio of twinning in the strengthened layer is greatly reduced by the high density β phase precipitated from the pre-solution, and the volume fraction of the twins is decreased significantly, because of the high density dislocation and precipitates induced by LSP.
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