摘要
采用喷铸法制备了组织均匀的Al88Ni6La4Mg2合金棒材。使用不同尺寸的铜模进行浇铸来改变合金凝固的冷却速率,得到三种不同尺寸的样品。分析了冷却速率对合金组织形貌和压缩力学性能的影响。结果表明:三种合金的相组成相同,均为α-Al相、Al3Ni相和Al11La3相。随着冷却速率的降低,Al3Ni和Al11La3粗化,Al11La3相由枝晶状变为多边形状,数量减少。压缩载荷下,合金的抗压强度和塑性均随冷却速率的提高而增大,采用直径为3 mm的铜模进行浇铸时,合金的综合力学性能最好,抗压强度和塑性应变分别为607 MPa和16%。
The homogeneous Al88Ni6La4Mg2 alloy bar was prepared by spray casting. Three kinds of samples with different sizes were obtained by casting with different sizes of copper molds to change the cooling rate during alloy solidification.The effect of cooling rate on microstructure and compression mechanical properties of the three kinds of alloys was analyzed. The results show that, the three kinds of alloys all have three phases which are α-Al, Al3Ni and Al11La3. With the decrease of cooling rate, Al3Ni and Al11La3 coarsens, the morphology of Al11La3 changes from dendrite shape to polygon shape and the quantity of Al11La3 decreases. Under compression loading, the compressive strength and the plasticity of the alloy increase with the increase of cooling rate, the alloy cast with φ3 mm copper mold has the best comprehensive mechanical properties. The compressive strength and plastic strain are 607 MPa and 16%, respectively.
作者
陈磊
张波
王海尧
宋世昊
CHEN Lei;ZHANG Bo;WANG Haiyao;SONG Shihao(School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China)
出处
《热加工工艺》
北大核心
2020年第11期44-47,共4页
Hot Working Technology
基金
辽宁省自然科学基金项目(20180510048)。
