TZM Alloy Neutron Radiation Handling As Follows:
Deformation strengthening both for pure molybdenum or molybdenum alloy TZM, are an important means of strengthening. TZM molybdenum alloy after deformation strengthening, not only strength, ductility improved, while the ductile - brittle transition temperature is lowered. Table 1 gives the TZM molybdenum alloy strain hardening performance data before and after. Can be seen, either at room temperature or high temperature, molybdenum TZM alloy after deformation tensile strength was improved.
The purpose of strain hardening, the alloy is deformed to lattice distortion, the dislocation density increases, and generate secondary grain, etc., so that the mechanical properties change. Means more deformation strengthening, such as forging, extrusion, hot and so on. In taking enhanced techniques should be based on product requirements to take a different shape and enhancement pattern.
Table TZM alloy tensile strength before and after deformation strengthening
| Material | Test temperature/℃ |
|||
| Room temperature | 1 300 | 1 400 | 1 500 | |
| Before deformation strengthening | 534.1 | 142.1 | 107.8 | 83.3 |
| After deformation strengthening | 790.9 | 245.0 | 174.4 | 117.6 |
In preparing TZM alloy bar, the commonly used strain hardening is hot extrusion. After extrusion, the alloy along the extrusion direction perpendicular to the extrusion direction and performance will vary. Because extrusion, mandatory, non-axial stress of the alloy severe tissue deformation, so that the body-centered cubic crystal structure of molybdenum <110> direction is almost parallel to the extrusion axis. Thus, the alloy extrusion axis direction along exhibit ductility in the vertical direction of extrusion is showing brittleness.
Literature reports a molybdenum TZM alloy or more 1 200 ℃ after hot rolling, the yield strength significantly increased, but did not reduce the elongation. By SEM, EBSD, TEM observation of the microstructure of the alloy, analysis, found that after the formation of the alloy hot rolled structural organization of a sub, this sub-structural organization of the grain (ie, secondary grain) at about 500nm (Fig.1). The presence of secondary grains, refined grains to some extent, but also makes hot-rolled alloy increased dislocation density inside, thus increasing the strength of the alloy.
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