本文選題：溫度梯度區(qū)域熔化 + 均勻化　； 參考：《稀有金屬材料與工程》2015年11期

【摘要】：采用SEM、EPMA、TEM以及顯微硬度測試等手段,研究了溫度梯度區(qū)域熔化(TGZM)對Al-Cu-Mg合金溶質(zhì)原子濃度分布、第二相析出以及顯微硬度的影響。研究表明:TGZM導(dǎo)致晶界兩側(cè)基體中的溶質(zhì)原子濃度存在顯著差異,靠近鑄錠邊部一側(cè)基體的Cu、Mg溶質(zhì)原子濃度明顯高于靠近鑄錠心部一側(cè)基體的溶質(zhì)原子濃度。在485℃的均勻化處理過程中,晶界兩側(cè)晶粒靠近邊部一側(cè)有大量第二相析出,而靠近心部一側(cè)則很少或者幾乎沒有第二相析出。該現(xiàn)象致使同一晶界兩側(cè)區(qū)域的顯微硬度值存在明顯差別,并且這種差別無法通過長時間的均勻化處理得以完全消除,在微觀上加劇了合金不同區(qū)域性能的差異。
[Abstract]:By means of SEM EPMA TEM and microhardness measurement, the effects of melting temperature gradient (TGZM) on solute concentration distribution, second phase precipitation and microhardness of Al-Cu-Mg alloy were studied. The results show that the concentration of solute atoms in the matrix on both sides of the grain boundary is significantly different due to the concentration of solute atoms in the two sides of the grain boundary. The concentration of solute atoms near the side of the ingot edge is obviously higher than that of the solute atom near the side of the ingot core. During the homogenization treatment at 485 鈩，

本文編號：1902532