Quantifying Grain Level Stress-Strain Behavior for AM40 via Instrumented Microindentation

Journal Article · Fri Jan 01 00:00:00 EST 2016 · MRS Advances

DOI:https://doi.org/10.1557/adv.2016.25· OSTI ID:1255366

Cheng, Guang; Barker, Erin I.; Stephens, Elizabeth V.; Choi, Kyoo Sil; Sun, Xin

ABSTRACT Microindentation is performed on hot isostatic pressed (HIP) Mg-Al (AM40) alloy samples produced by high-pressure die cast (HPDC) process for the purpose of quantifying the mechanical properties of the α-Mg grains. The process of obtaining elastic modulus and hardness from indentation load-depth curves is well established in the literature. A new inverse method is developed to extract plastic properties in this study. The method utilizes empirical yield strength-hardness relationship reported in the literature together with finite element modeling of the individual indentation. Due to the shallow depth of the indentation, indentation size effect (ISE) is taken into account when determining plastic properties. The stress versus strain behavior is determined for a series of indents. The resulting average values and standard deviations are obtained for future use as input distributions for microstructure-based property prediction of AM40.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1255366
• Report Number(s): PNNL-SA-117595; VT0505000
• Journal Information: MRS Advances, Vol. 1, Issue 12; ISSN 2059-8521
• Publisher: Materials Research Society (MRS)
• Country of Publication: United States
• Language: English