(1.福州大学材料系，福州350002；
2.IRC in Materials,University of Bir mingham)
摘 要: 研究了γ-TiAl基合金经离心喷射沉积成形时不同喷射距离对合金组织的影响。合金经等离子弧熔炼并重熔后，在真空条件下进行离心喷射沉积成形，喷射沉积距离分别为200、300、400和500mm。结果表明，经离心喷射沉积后的合金仍存在着孔隙，且随喷射距离的增加，孔隙率增加，孔隙越细密。成形后的组织结构为层片状组织，其形貌、层片大小也随成形距离的不同而变化。
关键字: TiAl 离心喷射沉积 孔隙率
STRUCTURE OF GAMMA TITANIUM ALUMINIDES
PREPARED BY CENTRIFUGAL SPRAY DEPOSITION
（1.Department of Materials, Fuzhou University, Fuzhou 350002
2．IRC in Materials, University ofBirmingham, UK）
Abstract:The effects of spray forming distances during centrifugal spray deposition process on the structure of a gamma titanium aluminide(Ti-48Al-2Mn-2Nb)were investigated.The ingot of alloy was first melted in a plasma melting furnace, and then remelted and spray-formed onto the inside of a set of moveable mild steel substrates over different spraying distances from 200mm to 500mm respectively, by means of centrifugal spray deposition under vacuum condition. The results showed that there exist pores in the as-sprayed alloys, the porosity levels increase as the spray forming distances increasing from 200mm to 500mm, and more and finer pores are found with the increasing of spray forming distances; the typical lamellar structure was obtained, but the configuration of alloy is changeable, which is related to the spray forming distances.
Key words: TiAl centrifugal spray deposition porosity
