Rolling Process Of Al/Al Laminated Material With Inner Grooves And Its' Properties

The Al/Al laminated material with inner groove(LMWIG)is a laminated material which was fabricated by roll bonding with the structure of inner groove.This material not only has light weight,sound insulation and other properties of sandwich foamed metal plate,but also has excellent bonding strength and mechanical properties of the laminated composite.In addition,it also has cooling,wiring and unique functions because of the inner groove.Therefore,The Al/Al LMWIG has broad application prospects.In this paper,the deformation behavior of inner groove and interface of Al/Al LMWIG was researched by finite element simulation.The effects of rolling reduction,rolling temperature,copper tube thickness,copper tube outer diameter/aluminum plate thickness(D/t)and grain size of the inner filler on the size of the grooves were investigated,and the best optimization scheme was also investigated.In addition,bonding strength and tensile properties of the Al/Al LMWIG fabricated by hot and cold rolling was studied.The effective height of groove increased with of the rise of rolling temperature and D/t aluminum plate,and increased with the down of rolling reduction and thickness of copper tube,and was not influenced by the diameter of NaCl powder within 150?m.The deformation of Al/Al LMWIG could be divided into three areas:The middle,groove and edge deformation zone,respectively.The copper tube expanded outward with the groove.The degree of deformation in the inside of groove was more server than that in the outside.The interfacial strain of LMWIG was lower and more inhomogeneous than that of laminated material without inner groove(LMWOIG).The Al/Al interfacial strain fabricated by hot rolling was bigger than that by cold rolling.The critical reduction of hot and cold roll bonding composite was lower that of LMWOIG,and was in 40%and 50%,respectively.Mechanical bonding mainly decided the bonding of Al/Al interface fabricated by cold rolling,while metallurgical bonding mainly contributed to the bonding of Al/Al interface produced by hot rolling.Therefore,the bonding strength of hot roll bonding was bigger than that of cold roll bonding with the value of 90MPa.The bonding strength of cold rolling first increased and then decreased with an increase in annealing temperature and time.When the annealing temperature and time were 65%and 450?,the bonding strength reached a maximum value.The bonding strength obtained by cold rolling linear increased with the increase of rolling reduction,while that of hot rolling was greatly affected by the rolling temperature.The most suitable rolling temperature and reduction were 450? and 55%,respectively.In addition,the hot roll bonding could obtain higher yield strength and tensile strength than cold roll bonding in the same annealing process because of smaller grain size.The tensile properties were best in rolling temperature at 400?.The tensile strength of LMWIG fabricated by cold and hot rolling were lower than that of original material.In general,the properties of AI/AI LMWIG fabricated by hot rolling were better than that of cold rolling.