Publication detail

CYCLIC FATIGUE RESISTANCE OF AZ91 MAGNESIUM ALLOY

NĚMCOVÁ, A. ZAPLETAL, J. JULIŠ, M. PODRÁBSKÝ, T.

Original Title

CYCLIC FATIGUE RESISTANCE OF AZ91 MAGNESIUM ALLOY

Type

journal article - other

Language

English

Original Abstract

The paper deals with determination of principal mechanical properties and the investigation of fatigue behaviour of AZ91 magnesium alloy. The experimental material was made by squeeze casting technique and heat treated to obtain T4 state (solution annealing), when hard, brittle Mg17Al12 intermetallic phase is dissolved. The basic mechanical properties (Young's modulus, ultimate tensile strength, yield strength, elongation to fracture and reduction of area) were determined by static tensile test. Furthermore, fatigue parameters were investigated. The S-N curve on the basis of smooth test bars tested under symmetrical push-pull loading at room temperature was evaluated. The measured data were subsequently used for fitting with suitable regression functions (Kohout & Věchet and Stromeyer) for determination of the fatigue parameters. Fatigue limit ?C of the studied alloy for 108 cycles is approaching 50 MPa. In addition, the fracture surfaces were observed by scanning electron microscopy. The failure analysis proved that the striations were observed in fatigue crack propagation area and in the area of static fracture was observed the transgranular ductile fracture. The structure of the studied alloy in the basic state and after heat treatment was observed by light and scanning electron microscopy.

Keywords

Magnesium alloy, solution annealing, mechanical properties, fatigue properties, fractography

Authors

NĚMCOVÁ, A.; ZAPLETAL, J.; JULIŠ, M.; PODRÁBSKÝ, T.

RIV year

2009

Released

9. 11. 2009

Location

Žilina

ISBN

1335-0803

Periodical

Materiálové inžinierstvo

Year of study

XVI

Number

4/2009

State

Slovak Republic

Pages from

5

Pages to

10

Pages count

6

BibTex

@article{BUT47152,
  author="Aneta {Němcová} and Josef {Zapletal} and Martin {Juliš} and Tomáš {Podrábský}",
  title="CYCLIC FATIGUE RESISTANCE OF AZ91 MAGNESIUM ALLOY",
  journal="Materiálové inžinierstvo",
  year="2009",
  volume="XVI",
  number="4/2009",
  pages="5--10",
  issn="1335-0803"
}