掺镧TZM合金板材断口形貌和组织分析

Fracture and Microstructure of La Doped TZM Plate

采用粉末冶金和轧制工艺制备不同掺镧方式的La-TZM合金,运用金相法、SEM和力学性能测试分别对其组织和性能进行研究,探讨La2O3和La(NO3)3两种掺镧方式对TZM合金力学强度及延伸率的影响机理。研究表明:La2O3-TZM合金抗拉强度为1057 MPa,延伸率为8.2%;La(NO3)3-TZM合金的抗拉强度为1202 MPa,延伸率为7.0%。La(NO3)3掺杂使合金组织内形成更加细小均匀的第二相,其断裂面为准解理断口,显著提高了TZM合金的强度,但对TZM合金的延伸率有一定的影响。

The different doping methods of La-TZM alloy plate were studied by observing and comparing the fracture and structure. The effect of La2O3 and La（NO3）3 on tensile properties and elongation of TZM alloy was discussed. The results show that the tensile strength of La2O3-TZM alloy plate is 1057 MPa and the elongation is 8.2%, while the tensile strength of La（NO3）3-TZM alloy is 1202 MPa, and the elongation is 7.0%. La（NO3）3 doped TZM alloy plate has finer second phase, and it makes the strength even higher, but lower the elongation.