Ti-29Nb-13Ta-4.6Zr高速压制行为及其烧结性能的研究

利用自主研发的机械蓄能式高速压机成形Ti-29Nb-13Ta-4.6Zr粉末并进行真空烧结,研究冲击能量对试样的密度及力学性能的影响。结果表明:随着冲击能量的提高,试样生坯密度提高,在冲击能量为1 805 J时,获得的最大生坯密度达到5.63 g/cm~3(相对密度94.1%);径向弹性后效随着冲击能量增加而增加;经真空1 250℃烧结后,烧结坯的密度随着冲击能量的增加而增加,但烧结坯的体积发生了膨胀,最大烧结密度为5.53 g/cm~3(相对密度为92.5%);真空烧结2.0 h后,钛合金的抗拉强度和硬度达到最大值,分别为629.8 MPa和324.5 HV。

High velocity compaction behavior and sintered properties of Ti-29Nb-13Ta- 4.6Zr alloy

The Ti-29Nb-13Ta-4.6Zr powder was compacted with a self-developed high velocity compaction ma-chine. The effect of impact energy on density as well as mechanical properties was investigated. The results reveal that the green density increases with increasing impact energy,the green density reaches a maximum of 5.63 g/cm3 (relative density of 94.1％)with impact energy of 1805 J. The radial spring back of the samples increase with in-creasing impact energy. After sintered in vacuum at 1250℃,the sintered density increases with the increase of im-pact energy while the volume of the sintered compacts expand and the sintered compacts obtain the maximum den-sity of 5.53 g/cm3(relative density of 92.5％). After sintered for 2.0 h in vacuum,the sintered compacts obtain the highest tensile strength of 629.8 MPa and the highest hardness of 324.5 HV.