高溫短時間時效處理對Mg-3Nd-1Zn合金微觀組織及力學性能的影響
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-02-23
將固溶處理后的 Mg-2.7Nd-0.6Zn-0.5Zr 合金在 200~300℃之間進行不同溫度及時間的高溫時效處理，研究高溫短時間時效處理對合金的微觀組織和力學性能的影響，并利用OM、SEM 及TEM對合金的微觀組織進行表征。
高溫短時間時效處理對Mg-3Nd-1Zn合金微觀組織及力學性能的影響Effects of high temperatureshort time ageing treatmenton the microstructures?and mechanical properties of Mg-Nd-Zn alloy將固溶處理后的 Mg-2.7Nd-0.6Zn-0.5Zr 合金在 200~300℃之間進行不同溫度及時間的高溫時效處理，研究高溫短時間時效處理對合金的微觀組織和力學性能的影響，并利用OM、SEM 及TEM對合金的微觀組織進行表征。結果表明：固溶態Mg-2.7Nd-0.6Zn-0.5Zr合金經250~275℃高溫短時間時效后，其室溫屈服強度和抗拉強度最高增加了近70%和29%，宏觀組織呈直線性不均勻分布的析出相。析出相的顯微形貌為顆粒狀，成分為Mg12Nd。析出相的線性分布方向平行于Mg基體(0001)Mg基面，合金的時效硬化行為與這種沿基面呈平行線分布的顆粒狀析出相密切相關。在250~275℃范圍內時效20~30min 后屈服強度較高，這是由于在變形過程中顆粒狀Mg12Nd 的特殊分布對基面滑移及晶粒間協調變形起到很強的抑制作用。?
Among the traditional cast Mg alloys system, Mg–3Nd–Zn alloy with high strength and heat?resistance, has been widely applied in aeronautics such as in engine box and wing rib of airplane. In present?research the as-cast Mg-2.7Nd-0.6Zn-0.5Zr (NZ31) alloy was solution treated and then aged at temperature?ranging from 200 to 300℃. The microstructure and mechanical properties of the aged specimens especially at?relatively high temperature (225~300℃) were systematically characterized by OM, SEM, and TEM. A new kind?of precipitates distributed in line was clearly found in the specimens aged at high temperature (225~275℃) for a?short time (15~30min), which corresponded to a significant enhancement of hardness and tensile strength at room?temperature.The TEM results showed that the precipitates distributed in line had a composition of Mg12Nd and a?granular shape, and mainly formed along the (0001)Mg basal plane.The special distribution of the granular?Mg12Nd precipitates was effective barriers to the basal slips and may probably restrain the intergranular?coordination during tensile deformation, leading to a large strengthening effect, that is, the yield strength and?ultimate tensile strength, of the NZ31 alloy aged at 250~275℃ for 20~30min, increased by about 70% and 29%?respectively, in comparison with only the solutionized one.
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