Effects On Structure And Property Of TZM Alloy Sintered Compact With Different Doping Method

TZM alloy (0.4%～0.55%Ti，0.06%～0.12%Zr，0.01%～0.04%C) is one of themost widely applied molybdenum alloy. TZM alloy has high melting point, highstrength, high elastic modulus, good corrosion resistance and good mechanicsperformance. This study aimed to improve the property of TZM, proposed a new kindof La doped TZM alloy. By solid-solid and solid-liqud doping method, sintering, TZMand a new kind of La doped TZM alloy were manufactured, that Mo, Ti, Zr were dopedin the form of powder while La, C were doped in the form of lanthanum nitrate,lanthanum oxide and stearic acid, graphite powder.The structure and property of TZM alloy were prepared by different processes. Theresults show: The solid-liquid doping method was better than traditional methods. Withimproved doping method and processing technology, the strength of La doped TZMalloy reaches342MPa, while the tensile rate1.54%. The La doping is the key factor ofmaking TZM be toughened and reinforced. Pinning at grain boundaries, the dispersedsecond phase particles of La oxides or Carbide will prevent grain boundary slippingeffectively and decrease dislocation distribution function, which inhibites grain growth,and makes the TZM alloy toughened and reinforced at the same time. Carbon dopingmakes grain size smaller and more homogeneous (0.06%). The method of carbondoping affects less in property, but the stearic acid doping has a good effect on pressing and sintering, and increase of10%and4%respectively.