In this work, a cast magnesium alloy AZ91D was friction stir processed. Detailed microstructural studies and Gleeble hot ductility tests were conducted on the as-cast and the FSPed samples to comparatively assess their heat-affected zone liquation cracking behavior. The results show that the use of FSP as a pretreatment to fusion welding can strikingly improve the heat-affected zone liquation cracking resistance of alloy AZ91D by reducing the amount and size of the low-melting eutectic β (Mg17Al12) as well as by refining the matrix grain size. © 2017, The Minerals, Metals & Materials Society and ASM International.

Ravi Sankar Kottada

Department of Metallurgical and Materials Engineering

Janaki Ram G D

G. M. Karthik

Aluminum alloys

Binary alloys

corrosion

Cracks

Friction

Friction stir welding

Heat affected zone

Heat resistance

Magnesium

CAST MAGNESIUM ALLOY

Friction stir processing

Fusion welding

HOT DUCTILITY TESTS

LIQUATION CRACKING

MATRIX GRAIN SIZE

Micro-structural

PRE-TREATMENT

Magnesium alloys

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IIT Madras

Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

In the current work, the effect of friction stir processing on heat-affected zone (HAZ) liquation cracking resistance of aluminum-copper alloy AA 2219 was evaluated. In Gleeble hot-ductility tests and longitudinal Varestraint tests, the FSPed material, despite its very fine dynamically recrystallized equiaxed grain structure, showed considerably higher susceptibility to HAZ liquation cracking when compared to the base material. Detailed microstructural studies showed that the increased cracking susceptibility of the FSPed material is due to (i) increase in the amount of liquating θ phase (equilibrium Al2Cu) and (ii) increase in the population of grain boundary θ particles. An important learning from the current work is that, in certain materials like alloy 2219, the use of FSP as a pretreatment to fusion welding can be counterproductive. © 2016, The Minerals, Metals & Materials Society and ASM International.

Heat-Affected Zone Liquation Cracking Resistance of Friction Stir Processed Aluminum-Copper Alloy AA 2219

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Producing nanograined microstructure in Mg–Al–Zn alloy by two-step friction stir processing

Use of Friction Stir Processing for Improving Heat-Affected Zone Liquation Cracking Resistance of a Cast Magnesium Alloy AZ91D

Journal	Data powered by TypesetMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Publisher	Data powered by TypesetSpringer Boston
ISSN	10735615
Open Access	No