MAO J,CHANG K M,YANG W H,et al.Cooling precipitation and strengthening study in powder metallurgy superalloy U720Li[J].Metallurgical and Materials Transactions A,2001,32:2441-2452.
[4]
O' NIELL H.Hardness measurement of metals and alloys[M].London:Chapman and Hall,1967.
[5]
P' NG K M Y,BUSHBY A J,DUNSTAN D J.Strength of coherently strained layered superlattices[J].Philosophical Magazine,2005,85(36):4429-4444.
JACKSON M P,REED R C.Heat treatment of UDIMET 720Li:the effect of microstructure on properties[J].Materials Science and Engineering A,1999,259(1):85-97.