Theoretical analysis of the aging response of order hardening alloys. [Al-Li]

Technical Report · Thu May 01 04:00:00 EDT 1986

OSTI ID:5474692

Glazer, J

Most precipitation-hardened aluminum alloys are used in specified aging conditions. An understanding of the sources of strength and yielding behavior is fundamental to defining desirable microstructures and designing processing steps to achieve them. In this paper, a model of aging behavior of alloys hardened by coherent, ordered precipitates with relatively low misfit strains is developed and some of its consequences explored. The model is based on the Hanson and Morris solution for the critical resolved shear stress for dislocations glide through a random array of obstacles. The model is applied to the specific case of delta' precipitates in binary aluminum-lithium alloys and found to be in good quantitative agreement with measured aging behavior. The effects of precipitate size, size distributions and shape on the critical resolved shear stress are explored via the model and predictions for more optimized microstructures presented.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5474692
• Report Number(s): LBL-21849; ON: DE86015124
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AGING
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
BINARY ALLOY SYSTEMS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
HARDENING
LINE DEFECTS
LITHIUM ALLOYS
PRECIPITATION HARDENING