离心喷射沉积 Ti-48Al-2Mn-2Nb 合金的拉压性能

为了研究合金化和制备工艺对ＴｉＡｌ合金性能的影响，采用一种最新的真空离心喷射沉积成形技术制备了Ｔｉ－４８Ａｌ－２Ｍｎ－２Ｎｂ合金，研究了合金的室温拉伸和压缩性能以及显微组织的影响。结果表明，离心喷射沉积成形合金的屈服强度为２５１ＭＰａ，抗拉强度为３０５ＭＰａ，延伸率为２．８％。压缩屈服强度为４８８ＭＰａ，抗压强度为２２１０ＭＰａ，压缩率为３３．９％。离心喷射沉积成形Ｔｉ－４８Ａｌ－２Ｍｎ－２Ｎｂ合金组织呈层片状组织结构，并且含有孔隙，定量分析结果表明孔隙率约２％。文中对离心喷射沉积成形Ｔｉ－４８Ａｌ－２Ｍｎ－２Ｎｂ合金层片状组织的变形和断裂特征进行了分析。

TENSILE AND COMPRESSIVE PROPERTIES OF Ti-48Al-2Mn-2Nb ALLOY BY CENTRIFUGAL SPRAY DEPOSITION

The tensile and compressive properties of a Ti-48Al-2Mn-2Nb alloy produced by a new technique—centrifugal spray deposition (CSD) were investigated at ambient temperature for us to understand the effects of alloying and processing on the properties of TiAl intermetallics. The results show that the yield strength of the alloy is 251MPa, tensile strength 305MPa and plasticity 2.8%, while compressive yield strength is 488MPa, compressive strength 2210 MPa, and compressive ratio 33.9%. The microstructure of the alloy shows a fine lamellar structure with some porosity. The deformation and fracture behavior of the alloy were also discussed.