Abstract Asymmetric plate impact experiments are conducted on LY12 aluminium
alloy in a pressure range of 85--131\,GPa. The longitudinal sound
speeds are obtained from the time-resolved particle speed profiles of
the specimen measured with Velocity Interferometer System for Any
Reflector (VISAR) technique, and they are shown to be good agreement
with our previously reported data of this alloy in a pressure range
of 20--70\,GPa, and also with those of 2024 aluminium reported by
McQueen. Using all of the longitudinal speeds and the corresponding
bulk speeds calculated from the Gruneisen equation of state (EOS),
shear moduli of LY12 aluminium alloy are obtained. A comparison of
the shear moduli in the solid phase region with those estimated from
the Steinberg model demonstrate that the latter are systematically
lower than the measurements. By re-analysing the pressure effect on
the shear modulus, a modified equation is proposed, in which the
pressure term of $P/\eta^{1/3}$ in the Steinberg model is replaced by
a linear term. Good agreement between experiments and the modified
equation is obtained, which implies that the shear modulus of LY12
aluminium varies linearly both with pressure and with temperature
throughout the whole solid phase region. On the other hand, shear
modulus of aluminium in a solid-liquid mixed phrase region decreases
gradually and smoothly, a feature that is very different from the
drastic dropping at the melting point under static conditions.
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10232040 and 10672149)
and the foundation of Laboratory for Shock Wave and Detonation
Physics Research, China Academy of Engineering Physics (Grant No
9140C6702020603).
Cite this article:
Yu Yu-Ying, Tan Hua, Hu Jian-Bo, Dai Cheng-Da Shear modulus of shock-compressed LY12 aluminium up to melting point 2008 Chin. Phys. B 17 264
Characteristics of urea under high pressure and high temperature Shuai Fang(房帅), Hong-An Ma(马红安), Long-Suo Guo(郭龙锁), Liang-Chao Chen(陈良超), Yao Wang(王遥), Lu-Yao Ding(丁路遥), Zheng-Hao Cai(蔡正浩), Jian Wang(王健), Xiao-Peng Jia(贾晓鹏). Chin. Phys. B, 2019, 28(9): 098101.
