罗文忠
,
沈军
,
李庆林
,
满伟伟
,
郑循强
,
刘林
,
傅恒志
金属学报
以Ti-43Al-3Si为籽晶, 研究了不同抽拉速率对TiAl合金籽晶法定向凝固全片层组织的影响. 结果表明, 60 mm/h抽拉速率下, 凝固组织中的片层方向能够与生长方向保持一致. 随抽拉速率增加, 由于温度梯度降低、成分过冷增大等因素的影响, 凝固组织中出现了与生长方向成45或90夹角的片层取向. 电磁搅拌引起的强制对流使固/液界面前沿的扰动不断增强, 晶体生长形态发生变化, 破坏了片层取向的一致性.
关键词:
TiAl
,
Lamellar microstructure
,
Seeding
,
TiAl
J.Zhang
,
K.Xia
材料科学技术（英文）
Enhancing mechanical properties and improving reliability of TiAl alloys by utilizing the mechanical anisotropy of the cast lamellar structure were reported. A self-oriented lamellar (SOL) microstructure was successfully produced in shaped components. After modification by hot isostatic pressing, such a microstructure exhibited improved mechanical properties. The TiAl rotor blades with SOL in a turbocharger passed rotation rig tests and showed enhanced engine performance.
关键词:
TiAl alloys
,
null
,
null
