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3Â¥2012-03-03 09:52:45
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casclzb(½ð±Ò+1): 2012-03-03 15:23:50
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Ö»¼ûµ½Ò»Æª¡£ Accession number: 20102513015887 Title: Study on microstructures and properties and near-net-shape process of powder metallurgy heat resistant titanium alloy Authors: Liang, Wang1 ; Hongjun, Lv1 ; Zebao, Lang1 ; Gang, Shi1 ; Yanqing, Jiang1 ; Caogen, Yao1 Author affiliation: 1 Aerospace Research Institute of Material and Processing Technology, China Box 9211, Beijing, 100076, China Corresponding author: Liang, W. (wliangsn@sina.com) Source title: 60th International Astronautical Congress 2009, IAC 2009 Abbreviated source title: Int. Astronaut. Cong., IAC Volume: 7 Monograph title: 60th International Astronautical Congress 2009, IAC 2009 Issue date: 2009 Publication year: 2009 Pages: 5915-5923 Language: English ISBN-13: 9781615679089 Document type: Conference article (CA) Conference name: 60th International Astronautical Congress 2009, IAC 2009 Conference date: October 12, 2009 - October 16, 2009 Conference location: Daejeon, Korea, Republic of Conference code: 80592 Publisher: International Astronautical Federation, IAF, 94bis Avenue de Suffren, Paris, 75015, France Abstract: The prealloyed powder metallurgy (PM) process is studied in this paper to prepare PM TC11 (Ti-6.5Al-3.5Mo-l.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 micro structures and properties of the PM TCI 1 alloy. The micro structures are examined by optical microscope, and the morphologies of PREP powders are observed by SEM. Room temperature and high temperature (550¡ãC) tensile properties (including ultimate tensile strength, yield strength, elongation and reduction of area) and elastic modulus of PM TCI 1 alloy are tested and discussed. The micro structures and properties of the PM TCI 1 alloy are compared with that of the same batch forged rod. Near-Net-Shape processes are studied to fabricate PM TC11 parts. By using of special dies, 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 micro structures of the PM TC11 alloy are fine and uniform and the typical ones are basket weave structures surrounded by equiaxed a. The PM TCI 1 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 spacecrafts. Number of references: 17 Main heading: Titanium alloys Controlled terms: Alloys - Aluminum powder metallurgy - Cerium alloys - Elastic moduli - Heat treatment - Spacecraft - Structural properties - Tensile strength - Titanium - Weaving - Zirconium Uncontrolled terms: Big dimension - Forged materials - Gridding - Heat resistant - Heat-resistant titanium alloys - High reliability - High temperature - Inner defects - Near-net-shape - Optical microscopes - Pre-alloyed powder - Reduction of areas - Room temperature - SEM - Stiffening ribs - TC11 alloy - Thin walls - Ultimate tensile strength - Weave structures - Yield strength Classification code: 951 Materials Science - 541.1 Aluminum - 542.3 Titanium and Alloys - 547.2 Rare Earth Metals - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 655.1 Spacecraft, General - 819.5 Textile Products and Processing - 537.1 Heat Treatment Processes - 531.1 Metallurgy - 422.2 Strength of Building Materials : Test Methods - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties - 408 Structural Design - 536 Powder Metallurgy Database: Compendex Compilation and indexing terms, © 2011 Elsevier Inc. |
4Â¥2012-03-03 11:41:15













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