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Abstract The fractoraphy of fatigue in air, in methanol or during dynamic hydrogen charging for the Ti-24Al-11Nb alloy was studied. The results showed that both hydrogen and methanol could promote fatigueof the alloy. The △K(th) decreases and the da/dn increases in the followins order: in air, in methanol,dynamic hydrogen charging medium. The prisms appeared on the fracture surface of corrosion fatigueduring dynamic charging indicated that hydrogen induced cleavage occurs along the base plane (0001)and prism planes {0110}. Some small dimples and some secondary microcracks of 3~6 μm in length onthe hydrogen induced cleaVage planes suggested that the cleavage cracks nucleated preferentially in α2platelets.
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Received: 25 April 1995
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| 1SastrySML,LipsittTK．MetallTransA;1977;SA:15432ChanKSMetallThans．A,1991,21A:26873GogieAK,BanerjeeD;NandyTNMetall．Thans．A,1990,21A:6094LukasakDA,KossDA．Metall．Thans．A,1990;21A:1355ChuWY,ThompsonAWMetall．Thans．A,1991,22A:716ChuWY,ThompsonAW．Metall．Thans．A,1992,23A:12297ChuWY,ThompsonAW．In:DasSK,BarlandCP,MarikarF．ed．HighPerformanceCompositesforthe1990’s,Warrendale,PA:TMS,1991,1438ZhangYue,WangYB;ChuYC,HsiaoCM．Script．Metall．Mater,1992,26:9259ZhangYue,WangYB;ChuWY,HsiaoCM．Script．Metall．Mater,1993,27:92710LipsittHA,ShechtmanD,SchafrikREMetall．Thans．A,1990,11A:136911MiaonishY．Phi．Map,1991,63A:1085 |
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