The effects of hydrogen on the physical and mechanical properties of iron and steel are reviewed. A new mechanism for the cold work peak for hydrogen in iron is considered. Together, internal friction and mechanical properties indicate that hydrogen softens iron by enhancing screw dislocation mobility at room temperature but hardens iron by core interactions at low temperatures. No single mechanism exists for the degradation of the properties of steel by hydrogen. Instead a complex process involving many of the proposed mechanisms as contributing factors is shown to account for most degradation phenomena.

Effects of hydrogen on the properties of iron and steel

Design, preparation and properties of non-oxide CMCs for application in engines and nuclear reactors: an overview

http://myweb.clemson.edu/~daw/D_reprints/MatSciRep.v9p251y93.pdf

The embedded-atom method: a review of theory and applications

Handbook of SiC properties for fuel performance modeling

Potential importance of hydrogen as a future solution to environmental and transportation problems

Promise and challenges of SiCf/SiC composites for fusion energy applications

Stress-Corrosion Cracking. Materials Performance and Evaluation

Al- and Mg-based alloys are being used for reducing the weight of automobiles. For structural applications, they must have adequate stress corrosion resistance, and yet, under some circumstances, stress corrosion cracking can occur in both alloy systems. Precipitation of the Mg-rich β-phase (Al3Mg2) at grain boundaries of Al-Mg alloys and the γ-phase (Mg17Al12) at grain boundaries of the Mg-Al alloys is a critical factor in their stress corrosion performance. In Mg-Al, the γ-phase is cathodic (noble) to the matrix, while in the Al-Mg case, the β-phase is anodic (active) to the matrix. These phases produce localized galvanic-induced corrosion that leads to intergranular stress corrosion cracking and crack growth rates of 350 and 1,800 times faster than the solution-treated condition, for Al-Mg and Mg-Al, respectively.

Stress Corrosion Cracking of Al-Mg and Mg-Al Alloys

This book contains four sections, each consisting of several papers. The section titles are: Crack-Tip Chemistry; Atomistics of Fracture; Stress-Corrosion Cracking and Hydrogen Embrittlement; and Corrosion Fatigue.

Modeling environmental effects on crack growth processes

This article summarizes a series of experiments to determine the influence of Mg on the corrosion and electrochemical behavior of Al. Magnesium is commonly added to increase the strength of lightweight nonheat treatable Al alloys. However, these alloys are susceptible to grain boundary dissolution, stress corrosion cracking, or hydrogen induced embrittlement due to changes in the alloy structure and elemental distribution during processing, welding, or in-service exposure to elevated temperatures. Auger electron spectroscopy and transmission electron microscopy measurements show that alloys having a distribution of Al3Mg2 (β phase) precipitates and segregated Mg on grain boundaries are more susceptible to cracking. To understand the roles of Mg on the cracking process we compared the corrosion potential and film formation of pure Al, Al implanted with Mg, a 7 wt % Mg–Al alloy and pure Al3Mg2 phase. The surfaces of the specimens were cleaned and prepared in a surface analysis system and transferred in a va...

Russell H. Jones

Papers

Promise and challenges of SiCf/SiC composites for fusion energy applications

Stress-Corrosion Cracking. Materials Performance and Evaluation

Stress Corrosion Cracking of Al-Mg and Mg-Al Alloys

Modeling environmental effects on crack growth processes

Influence of Mg on the corrosion of Al