This paper deals with the influence of solution treatment

ageing and stabilizing process on the structures

propertles

stresses and dimensional stability of conmercial forging aluminium LD

2

by means of metalloscope

electron mic roscope

x-ray diffractometer

x-ray stress analyzer and method for the determination of mechanical properties. The experimental results suggested that under certain circumstances a good strengthening and toughenning effect can be obtained. By controling the conditions of solution treatment

quenching tempereture

ageing tempereture

ageing time and conditions of cold-heat cyclic stabilizing it may stabilize structures

reduce the residual stresses and meet the need of dimensional stability of parts required high dimensional stability in fine machine and fine instrument.