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Yttria Content ImpactOn ZHMR Normal Performance

Yttria Content ImpactOn ZHMR Alloy(Zirconium Hafnium Molybdenum Rare Earth Alloy) Normal Performance As Follows:

By the following table to study yttria content on ZHMR alloy at room temperature properties.

No. 
Mo   ZrH2 HfH2 Y2O3
1
97.8
0.5
1.5
0.19
0
2
97.3
0.5
1.5
0.19
0.5
3
97
0.5
1.5
0.19
0.8
4
96.8
0.5
1.5
0.19
1
5
96.6
0.5
1.5
0.19
1.2
6
96.3
0.5
1.5
0.19
1.5

Yttrium oxide with rare earth oxide added increases, the room temperature, ZHMR alloy the tensile strength increased from 390MPa to 550MPa, but the added amount of yttrium oxide than 1.2%, the tensile strength decreased significantly, plus rare earth oxides of Y2O3 ZHMR elongation of alloy (4-5)%, the processing state ju ZHMR4 tensile strength alloy chamber 792MPa, elongation of 6.5%.

Powder metallurgical state ZHMR alloy dosage (0.8 ~ 1.2) at room temperature write intensity reaches the maximum value. The compressive strength at room temperature showed that when yttrium oxide addition is 0.8%, the maximum compressive strength of 3600MPa. Chang Wen Weishi hardness results show that with the increase in the amount of Y2O3 added, hardness slowly rising, ZHMR6 hardness of 2300MPa. In a certain range, with the increase of the content of yttrium oxide to improve the tensile strength caused mainly due to the grain refinement.

zhmr alloy

In ZHMR4 alloys, mainly in the form of yttrium Y2Hf2O7, in addition to a small amount of Y2O3, Zr0.02Y0.18O1.01 exist. In the initial stage of sintering, HfH2 molybdenum powder particle surface along the reaction leisure HfO2, Y2O3 and HfO2 △ G generated in the low Y2Hf2O7, which along with the sintering process for Andrew, it can effectively prevent the movement of a grain boundary of the powder, Therefore, the grain size of sintered compact than without yttria was clearly refined.

By the Hall-Patch finer grain than the formula indicates, the higher the yield strength. In the matrix along with the precipitation strengthening HfC particle (diameter 0.01 ~ 01lμm), the stretching, the base body and the dislocation lines is in effect only to bypass HfC particles HfC left around the dislocation loop, this effect is Orowan mechanism. Such HfC impediment for dislocations also showed strength improved.

If you have any interest in our ZHMR alloy(Zirconium Hafnium Molybdenum Rare Earth Alloy) or other molybdenum alloy products, please feel free to contact us by email: sales@chinatungsten.com,sales@xiamentungsten.com or by telephone:86 592 512 9696.

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