SiC強化Al合金の室温・高温疲労寿命に及ぼす破壊モード遷移の影響

概要

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A study has been made of the fatigue fracture mechanism in A6061 T6 metal matrix composite (MMC) reinforced with 5vol.% SiC particulate at room and elevated temperatures. The main results are summarized as follows. (1) Fatigue strengh decreased with increase of ambient temperature. (2) Relationship between fatigue life and temperature followed the Arrhenius rule. Therefore the fracture mechanism was the same, irrespective of ambient temperature. (3) Fatigue cracking of MMC initlated in the aluminum matrix and crack growth was in the shear mode, because the morphology of the fractured surface showed crystallographic facets. Then, fatigue crack growth mode changed from shear to monotonic fracture mode. (4) The transition occurred at the point at which the plastic zone size of the crack tip became larger than the average SiC particle size.
一般社団法人日本機械学会の論文
1997-02-25