Brasche, L.J.H., D.J. Bracci, D.C. Jiles and O. Buck, “Electrical and Mechanical Properties of Precipitation Hardened Al-Li Alloys,” Materials Science and Engineering A, Vol. 119, 1989, pp. 7–15. Brauer, G., L. Liszkay, B. Molnar and R. Krause-Rehberg‚“Microstructural Aspects of Neutron Embrittlement of Reactor Pressure Vessel Steels – A View from Positron Annihilation Spectroscopy,” Nuclear Engineering and Design, Vol. 127, 1991, pp. 47–54. Dobmann, G., Luigi Debarberis and Jean-Francois Cosle, “Aging Material Evaluation and Studies by Non-destructive Techniques (AMES-NDT) A European Network Project,” Nuclear Engineering and Design, Vol. 206, 2001, pp. 363–374. Floreen, S. and R.F. Decker, “Heat Treatment of 18% Ni Maraging Steel,” Source Book on Maraging Steels, R.F. Decker, ed., Metals Park, Ohio, ASM, 1979, pp. 20–32. Gur, C.H. and I. Yildiz, “Non-destructive Investigation on the Effect of Precipitation Hardening on Impact Toughness of 7020 Al-Zn-Mg Alloy,” Materials Science and Engineering A, Vol. 382, 2004, pp. 395–400. Jin, S., D. Huang and J.W. Morris, Jr., “Structure and Properties of a Microduplex Maraging Steel,” Metallurgical Transactions A, Vol. 7A, 1976, pp. 637–645. Kirkegaard, P., M. Eldrup, O.E. Mogensen and N.J. Pedersen, “Program System for Analysing Positron Lifetime Spectra and Angular Correlation Curves,” Computer Physics Communications, Vol. 68, 1981, pp. 307–335. Kumar A., T. Jayakumar, Baldev Raj and K.K. Ray, “Correlation between Ultrasonic Shear Wave Velocity and Poisson’s Ratio for Isotropic Solid Materials,” Acta Materialia, Vol. 51, 2003, pp. 2417–2426. Ledbetter, H.M. and D.T. Read, “Low-Temperature Elastic Properties of a 300-Grade Maraging Steel,” Metallurgical and Materials Transactions A, Vol. 8A, Nov. 1977, 1805–1808. Li, P., S.L. Chu, C.P. Chou and F.C. Chen, “Use of Ultrasonic Velocity for Nondestructive Evaluation of Ferrite Content in Duplex Fe-Mn-Al Alloy Steels,” Scripta Metallurgica et Materialia, Vol. 26, 1992, pp. 127–132. Miller, G.P. and W.I. Mitchell, “Structure and Hardening Mechanisms of 18% Nickel-Cobalt-Molybdenum Maraging Steels,” Journal of the Iron and Steel Institute, Vol. 203, 1965, pp. 899–904. Moore, K.D., P.L. Jones and H.F. Cocks, “A Positron Annihilation Study of the Precipitation Hardening Effects in a Maraging Steel,” Physica Status Solidi A, Vol. 72, 1982, pp. K223–K227. Peters, D.T. and C.R. Cupp, “The Kinetics of Aging Reactions in 18 Pct Ni Maraging Steels,” Transactions of the Metallurgical Society of AIME, Vol. 236, 1966, pp. 1420–1429. Rajaraman, R., P. Gopalan, B. Viwanathan and S. Venkadesan, “A Positron Annihilation Study of TiC Precipitation in Plastically Deformed Austenitic Stainless Steel,” Journal of Nuclear Materials, Vol. 217, 1994, pp. 325–328. Rajkumar, K.V., S. Vaidyanathan, Anish Kumar, T. Jayakumar, Baldev Raj and K.K. Ray, “Characterization of Aging-Induced Microstructural Changes in M250 Maraging Steel Using Magnetic Parameters,” Journal of Magnetism and Magnetic Materials, Vol. 312, 2007a, pp. 359–365. Rajkumar, K.V., Anish Kumar, T. Jayakumar, Baldev Raj and K.K. Ray, “Characterization of Aging Behavior in M250 Grade Maraging Steel Using Ultrasonic Measurements,” Metallurgical and Materials Transactions A, Vol. 38A, 2007b, pp. 236–243. Sha, W., A. Cerezo and G.D.W. Smith, “Phase Chemistry and Precipitation Reactions in Maraging Steels: Part I. Introduction and Study of Cocontaining C-300 Steel,” Metallurgical and Materials Transactions A, Vol. 24A, 1993, pp. 1221–1232. Vasudevan, V.K., S.J. Kim and C.M. Wayman, “Precipitation Reactions and Strengthening Behavior in 18 Wt Pct Nickel Maraging Steels,” Metallurgical and Materials Transactions A, Vol. 21A, 1990, pp. 2655–2668. Zaitseva, R.D. and M.D. Perkas, “Factors Determining the Ductility and Toughness of Maraging Steels,” Metal Science and Heat Treatment, Vol. 17, No. 9, 1975, pp. 729–736.