等离子体氢化对TiAl合金组织及力学性能的影响

Effects of Plasma-hydrogenation on Microstructure and Mechanical Properties of TiAl Alloy

对TiAl合金进行了等离子体氢化处理,研究了氢化处理对TiAl合金组织及力学性能的影响。结果表明,通过LECO ROH600氢氧含量分析仪测得H实际含量为0.060%。置氢处理前后TiAl合金的相组成未发生变化,仍为γ-TiAl和α2-Ti3Al,氢以固溶的形式存在于TiAl合金中。置氢处理后,合金硬度和室温抗压强度均有所提升。高温变形过程中的流变应力更低,材料再结晶程度提高,变形更加均匀。

Effects of hydrogen on the microstructure and mechanical properties of TiAl alloy hydrogenated by plasma were investiagted. The actual hydrogen content measured by the LECO ROH600 hydrogen and oxygen analyzer reach 0.060%. The XRD, SEM, microhardness, room temperature and high temperature mechanical properties, and high temperature deformed microstructures were analyzed for hydrogenated and unhydrogenated TiAl alloys. The results reveal that the phase composition of TiAl alloy with hydrogen is absent change, and it is still γ-TiAl and α2-Ti3Al. Hydrogen exists in solid solution in the TiAl alloy. After the TiAl alloy is hydrogenated by plasma, the hardness and compressive strength at room temperature are improved. The flow stress during high temperature deformation is decreased, and the degree of material recrystallization is improved, so the deformation presents more uniform.