The role of elevated temperature exposure on structural evolution and fatigue strength of eutectic AlSi12 alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F16%3A00464558" target="_blank" >RIV/68081723:_____/16:00464558 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2015.05.007" target="_blank" >http://dx.doi.org/10.1016/j.ijfatigue.2015.05.007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2015.05.007" target="_blank" >10.1016/j.ijfatigue.2015.05.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The role of elevated temperature exposure on structural evolution and fatigue strength of eutectic AlSi12 alloys

Popis výsledku v původním jazyce

Pistons of internal combustion (IC) engines are typically subjected during operation to high cycle fatigue loading at elevated temperatures (up to 350 degrees C). The materials typically used for piston production are eutectic Al-Si alloys for their excellent fluidity and suitable mechanical properties. Results of a fatigue testing program of eutectic Al-Si alloys at room temperature and at elevated temperatures (250 degrees C, 300 degrees C and 350 degrees C) performed with the aim to support piston design and material optimization are reported in this paper. Specimens were extracted from piston crowns and tested in a rotating bending test machine. The fatigue strength at 10(7) cycles was quantified by a staircase approach.To investigate the strengthening mechanism based on the formation of precipitates (Guinier-Preston (GP) zones) during decomposition of a metastable supersaturated solid solution, a structural investigation of one of the alloys before and after fatigue testing at elevated temperatures was conducted. Metallography, color etching, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to elucidate the following aspects: (1) the structural features of the alloy (dendrites of a-phase, primary Si particle size and distribution, morphology and distribution of intermetallic phases); (2) the changes of the strengthening mechanism (GP zones) with elevated temperature exposure.

Název v anglickém jazyce

The role of elevated temperature exposure on structural evolution and fatigue strength of eutectic AlSi12 alloys

Popis výsledku anglicky

Pistons of internal combustion (IC) engines are typically subjected during operation to high cycle fatigue loading at elevated temperatures (up to 350 degrees C). The materials typically used for piston production are eutectic Al-Si alloys for their excellent fluidity and suitable mechanical properties. Results of a fatigue testing program of eutectic Al-Si alloys at room temperature and at elevated temperatures (250 degrees C, 300 degrees C and 350 degrees C) performed with the aim to support piston design and material optimization are reported in this paper. Specimens were extracted from piston crowns and tested in a rotating bending test machine. The fatigue strength at 10(7) cycles was quantified by a staircase approach.To investigate the strengthening mechanism based on the formation of precipitates (Guinier-Preston (GP) zones) during decomposition of a metastable supersaturated solid solution, a structural investigation of one of the alloys before and after fatigue testing at elevated temperatures was conducted. Metallography, color etching, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to elucidate the following aspects: (1) the structural features of the alloy (dendrites of a-phase, primary Si particle size and distribution, morphology and distribution of intermetallic phases); (2) the changes of the strengthening mechanism (GP zones) with elevated temperature exposure.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Fatigue

ISSN

0142-1123

e-ISSN

—

Svazek periodika

83

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

24-35

Kód UT WoS článku

000367111200004

EID výsledku v databázi Scopus

2-s2.0-84947125660