Studies were carried out on the precipitation in two sets of binary Al-Li alloys by means ofhardness tests,DSC analyses and TEM observations.When the alloys wer
By adding small amount of Mg to the wrought superalloys,the steady stage of creep,and es-pecially the tertiary stage of creep are prolonged.Also,the steady cree
The TEM observation on the single-side thinned specimens was made of the nucleation andgrowth of boride during boronization for steel 20 and the influence of pr
In combination with the Bagnold’s shearing theory and the principle of Markov process,amathematical model of sluice type’s gravity concentrators has been deve