A1. ED0008232-B.pdf
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- PIP-II Niobium Sheets, Rings, and Disks
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- 385634-DSF
About this file
This is a Technical Specification document for Titanium-Niobium alloy materials to be used in PIP-II 650 MHz Superconducting Radio Frequency (SRF) cavities at Fermi National Accelerator Laboratory. The specification establishes material requirements, testing standards, and documentation protocols for suppliers providing this specialized alloy.
The material must meet specific chemical composition requirements with Titanium at 55±1%, Niobium as the remainder, and strict limits on impurities including Hydrogen (≤0.0045%), Oxygen (≤0.1%), and other elements such as Aluminum, Carbon, and Chromium (each ≤0.01%). Hardness testing per ASTM E92, E384, or manufacturer equivalents must demonstrate values between 130-170 HV, while mechanical strength testing per ASTM E8 must achieve minimum yield strength of 60,000 psi (410 MPa) and minimum tensile strength of 65,000 psi (450 MPa). Material finish must be free of injurious external and internal imperfections, with samples taken after all metallurgical processing and annealing but before work hardening. Suppliers must provide comprehensive documentation including traceability information (lot number, serial number, heat treatment number) and certification with chemical analysis, hardness test, and tension test reports showing the testing standards used. Material packaging must prevent damage during transportation with specific details to be coordinated prior to shipment. The specification references ASTM B884-11, ASTM B265, ASTM E92, ASTM E384, and ASTM E8, allowing industry or manufacturer standards as alternatives if identified and approved by Fermilab.
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Fermi National Accelerator Laboratory 1
Technical Specification for Titanium Niobium Alloy for Use in PIP-II 650 MHz Superconducting Radio Frequency Cavities
Author: S. Chandrasekaran
Document Number: ED0008232
Fermi National Accelerator Laboratory 2
Document Approval Date Approved Originator S. Chandrasekaran As in Teamcenter Reviewer Approver G. Wu As in Teamcenter
Revision History Author Revision Date Description of Change S. Chandrasekaran 29 AUG 2018 Initial release
H. Park 15 JUN 2021
Section 2: ASTM B884 changed from applicable document to reference document.
Section 3: Added microstructure, hardness, mechanical strength requirements.
Added section 4 documentation requirements.
Added section 5 packaging and shipping.
C. Narug, H. Park 7 FEB 2022
Section 3.1: Microstructure replaced by Finish.
Section 3.4: Mechanical strength requirement changed.
Fermi National Accelerator Laboratory 3
1 Introduction
Fermi National Accelerator Laboratory (FNAL, Fermilab) designs and constructs superconducting particle accelerators. This specification addresses Titanium-Niobium alloy for superconducting radio-frequency (SRF) cavities, which are a key component of particle accelerators.
Components are fabricated from stock by machining or other metal-forming processes.
Components are joined by electron-beam welding or TIG welding. Cavities are operated in a cryogenic vacuum environment, requiring pressure certifications and material traceability. All of these factors motivate the content of this specification.
2 Reference Documents
The requirements in this specification are originated or modified from ASTM B884-11 (reapproved 2019) and ASTM B265. This specification refers to ASTM Testing methods.
However, industry or manufacturer’s standards are allowed as long as those standards are identified and approved by Fermilab.
ASTM B884-11 (Reapproved 2019) Standard Specification for Niobium-Titanium Alloy Billets, Bar, and Rod for Superconducting Applications
ASTM B265 Specification for Titanium and Titanium Alloy Strip, Sheet, and Plate ASTM E92 Standard Test Methods for Vickers Hardness and Knoop Hardness of
Metallic Materials ASTM Test Methods E384 Standard Test Method for Microindentation Hardness of Materials ASTM E8 Standard Test Methods for Tension Testing of Metallic Materials
Source of Documents
The documents may be obtained from the following source(s):
ASTM Documents:
American Society of Testing and Materials 1916 Race Street Philadelphia, PA 19103
Fermi National Accelerator Laboratory 4
3 Requirements
The material to be supplied shall meet the following requirements.
Samples for testing shall be taken from the finished material after all metallurgical processing including annealing and before work hardening process such as rolling.
3.1 Finish
Material should be free of injurious external and internal imperfections of a nature that will interfere with the purpose for which is intended.
3.2 Chemical composition
Analytical methods for chemical composition shall be in accordance with industry or manufacturer’s standards.
Titanium 55 1 % Aluminum 0.01 % Carbon 0.02 % Chromium 0.01 % Copper 0.01 % Hydrogen 0.0045 % Iron 0.02 % Nickel 0.01 % Nitrogen 0.015 % Oxygen 0.1 % Silicon 0.01 % Tantalum 0.25 % Niobium remainder
3.3 Hardness
Hardness testing shall be according to Test Methods E92, E384 or manufacturer’s equivalent.
130 HV < 170
3.4 Mechanical strength
Tension testing according to ASTM E8 or manufacturer’s equivalent standard shall be performed to determine yield strength and ultimate tensile strength. Subsize test specimens of ASTM E8 are allowed.
Fermi National Accelerator Laboratory 5
The minimum strength requirement shall be as follows:
Minimum yield strength 60,000 psi (410 MPa) Minimum tensile strength 65,000 psi (450 MPa)
4 Documentation Requirements
Materials shall include, at minimum, the following material documentation:
Traceability information
Manufacturer’s unique identifiers that trace the material including but not limited to Lot number, Serial number, and Heat treatment number.
Certification
A certificate showing the following test results.
o Chemical analysis report and testing standard used o Hardness test report and testing standard used o Strength (Tension) test report and testing standard used
5 Packaging and Shipping
Material shall be packaged such a way that no damage occurs during transportation.
Details of packaging shall be discussed before shipping.
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