Study on Microstructures and Properties and Near-Net-Shape Process of Powder Metallurgy Heat Resistant Titanium Alloy
- Paper number
IAC-09.C2.I.3
- Author
Mr. Wang Liang, Aerospace Research Institute of Materials & Process. Tech., China
- Coauthor
Prof. Hongjun lv, China
- Coauthor
Mr. Yao Caogen, China Academy of Launch Vehicle Technology, China
- Year
2009
- Abstract
Abstract: The prealloyed powder metallurgy (PM) process is studied in this paper to prepare PM TC11 (Ti-6.5Al-3.5Mo-1.5Zr-0.3Si) alloy, which is a kind of heat resistant titanium alloy. And HIP technology and PREP powders are used in the prealloyed processing to get full density material. Heat treatments are studied to optimize the microstructures and properties of the PM TC11 alloy. The microstructures are examined by optical microscope, and the morphologies of PREP powders are observed by SEM. Room temperature and high temperature (550ºC) tensile properties (including ultimate tensile strength, yield strength, elongation and reduction of area) and elastic modulus of PM TC11 alloy are tested and discussed. The microstructures and properties of the PM TC11 alloy are compared with that of the same batch forged rod. Near-Net-Shape processes are studied to fabricate PM TC11 parts. Using metal capsule and forming mould, a big dimension thin wall integrity PM TC11 alloy spacecraft cabin with inner gridding stiffening ribs is near-net-shaped and no inner defect is detected. The results show that the PM TC11 alloy has same good tensile properties as forged material and plus perfect elastic modulus. The microstructures of the PM TC11 alloy are fine and uniform, and the typical ones are basketweave structures surrounded by equiaxed α. The PM TC11 alloy and suitable near-net-shape process can be used in the field of fabricating high performance-to-cost, high reliability, lightweight and heat resistant parts for spacecraft.
- Abstract document
- Manuscript document
IAC-09.C2.I.3.pdf (🔒 authorized access only).
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