Estimation of friction during equal channel angular (ECA) pressing of aluminum alloys

Candidature of equal channel angular pressing for processing of tubular commercial purity-titanium

“…The magnitude of the increase in load was reported to be higher in Route A than in Route C by the above authors. In a similar way, load increment for every pass up to four passes (for pure aluminium) and up to two passes (for Al-Mg-Si alloy) and then stabilization of the maximum load up to 16 passes during ECAP of Route C has been previously reported [16]. None of the published results show a decrease in the forming load during ECAP, as observed for Route A in the current study.…”

Principles of equal-channel angular pressing as a processing tool for grain refinement

“…A suitable lubricant such as MoS 2 is generally used to minimize frictional effects at the die walls. However, an alternative approach for minimizing friction is to make use of more complex configurations incorporating moving die walls [52,53,[101][102][103]. Two examples of movable die walls are shown in Fig.…”

The development of hardness homogeneity in aluminum and an aluminum alloy processed by ECAP

“…In practice, however, it is well established that the use of an ECAP die with a sharp corner having an arc of curvature of Y = 0°leads to the occurrence of a ''dead zone'' at this outer corner where the billet is no longer in contact with the die wall [11,[14][15][16][17][18]. Although the problems associated with these dead zones can be alleviated or removed through the use of dies having movable die walls [19,20], the construction of these dies is not easy and therefore their use tends to be inconvenient and time-consuming. In practice, therefore, conventional dies where the die walls are fixed are generally more practical for use in ECAP processing.…”