Investigations of microstructure, impact toughness, and fatigue failure behavior of bulk UFG Al-Li 8090 alloy processed by multi-axial forging

被引：0
作者：
Panwar, Amit [1 ]
Joshi, Amit [1 ]
Tejyan, Sachin [1 ]
机构：
[1] Govind Ballabh Pant Inst Engn & Technol, Dept Mech Engn, Pauri Garhwal 246194, India
来源：
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES | 2024年 / 49卷 / 02期
关键词：
Multi axial forging; High cycle fatigue; Impact toughness; Electron backscattered diffraction; AA7075; ALUMINUM-ALLOY; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; TEXTURE EVOLUTION; MICRO;
D O I：
10.1007/s12046-024-02446-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study investigates the profound influence of multi-axial forging (MAF) on the microstructural characteristics, high cycle fatigue properties, and impact toughness behaviour of the bulk ultrafine-grained aluminum-lithium (Al-Li) 8090 alloy. The solution-treated Al-Li 8090 alloy was subjected to MAF at both liquid nitrogen temperature (LNT) and room temperature for 2, 4, and 6 forging cycles, resulting in cumulative true strains of 1.2, 2.4, and 3.6, respectively. The MAFed sample at LNT after 6 cycles displayed a well-defined ultrafine-grained microstructure, exhibiting grain sizes ranging from 100 to 400 nm. Detailed electron backscatter diffraction analysis confirmed significant grain refinement with increasing MAF cycles for various conditions. The high-cycle fatigue strength exhibited a progressive enhancement with the increasing number of cycles and was observed to be maximum for the CF cycle-6 condition (131 MPa), attributing to the effective suppression of dynamic recovery at cryogenic temperatures.
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页数：14
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