摘要
研究了Ａｌ－ＲＥ合金的高温性能，用扫描电镜、电子探针对该合金的断口形貌和相成分进行了分析。结果表明，该合金在３５０～４００℃的高温下仍具有优越的力学性能，比一般耐热铝合金的耐热温度提高５０℃。这主要是因为合金中形成了多种高温稳定的稀土化合物相，这些化合物相呈放射状分布在晶界和枝晶间，可有效地阻碍高温下晶界的滑移。
In this paper,the properties of alloy Al-RE-Cu-Mn-Si at elevated temperature are discussed. Fracture characteristic and phase composition feature are analysed with SEM and EPMA. Results show that the alloy remains exellent mechanical properlies even at 350～400℃. Its heat resisant temperature increased 50℃ compared with ordinary leat resistant aluminum alloys.The main reason is that many stable rare earth comiounds are formed in the alloy.They are disributed at crysal boundary and inter-dendritic boundary in radicactive shape, and thus prevent effectlvely crystal boundary from slip and preven marix from plastic defomation at elevaed emioaure.
出处
《兵器材料科学与工程》
CSCD
北大核心
1995年第4期19-22,72,共5页
Ordnance Material Science and Engineering
关键词
铝合金
稀土化合物
晶界强化
合金
Al alloy, RE compounds, strengthening of crystal boundary
