Cyclic deformation and fatigue in TiAl intermetallic compound under plastic strain control

✍ Scribed by Masahide Satoh; Susumu Horibe; Morihiko Nakamura; Hiroyuki Uchida

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 501 KB
• Volume: 32
• Category: Article
• ISSN: 0142-1123
• DOI: 10.1016/j.ijfatigue.2009.10.009

✦ Synopsis

For Mn-containing Ti-48 at.%Al intermetallic compound with a lamellar structure and an equiaxed nearc structure obtained by heat treatment, a tension-compression fatigue test under plastic strain control was conducted to clarify the fatigue behavior of TiAl. Cyclic hardening occurs significantly in the equiaxed near-c structure but not in the lamellar structure. The lamellar structure shows the pointed hysteresis loop, whereas the equiaxed near-c structure exhibits the relatively rounded loop. The variation of the hysteresis loops during cycling was investigated by using the modified energy parameter b 0 E , and it has been clarified that the strain localization process depends greatly on the microstructure.