Tear Toughness Evaluation of a Permanent Mold Cast A356 Aluminum Alloy Using a Small-size Specimen

Zhu, Hong; Kumai, Shinji; Tanaka, Toshikazu; Sato, Akira

doi:10.2320/matertrans.45.1714

Cited by 13 publications

(13 citation statements)

References 5 publications

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“…Specifically, plate-like Mg 2 Si in lamella AlMg 2 Si eutectic structure changed to globular Mg 2 Si at high cooling rates over about 1000 K/s. No morphological change was observed for Al 6 Mn particles. Al-13%Mg 2 Si pseudobinary alloy was also fabricated and the spheroidizing of Mg 2 Si phase at the high cooling rate was confirmed.…”

Section: Discussionmentioning

confidence: 82%

“…In this case, the effect of metallurgical microstructure is masked even though the refined microstructure is beneficial for increase in ductility. In contrast, a series of previous works by Kumai et al [2][3][4][6][7][8][9] found that the loaddisplacement curve obtained by the tear test using a notched specimen shows good reproducibility even if casting defects are included in the specimen. In addition, they reported that the shape of load-displacement curve is quite sensitive to the microstructural change of the specimen.…”

Section: Introductionmentioning

confidence: 89%

“…5) Kumai et al [2][3][4][6][7][8][9] have employed the tear test to examine the relationship between solidification structure and tear resistance. Tensile test using a smooth bar or a plate specimen is a standard method for mechanical property evaluation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cooling Rates during Solidification of Al-5.5%Mg-2.3%Si-0.6%Mn and Al-13%Mg<SUB>2</SUB>Si Pseudo-Binary Alloys on Their Secondary-Particle Morphology and Tear Toughness

Shimosaka

Kumai

Casarotto³

et al. 2011

Mater. Trans.

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Al-5.5%Mg-2.3%Si-0.6%Mn alloy and Al-13%Mg 2 Si pseudo-binary alloy were cooled at various cooling rates during solidification. Morphological change of secondary particle was examined. Solidified structure of Al-5.5%Mg-2.3%Si-0.6%Mn alloy consisted of primary -Al dendrites, Al-Mg 2 Si eutectic structure and Al 6 Mn particles. The most significant morphological change was from lamella Al-Mg 2 Si eutectic structure in the permanent mold cast and the die-cast product to refined and globular Mg 2 Si phase in the high-speed twin-roll cast product. In contrast, no morphological change was observed for Al 6 Mn particles. In order to investigate the effect of morphological change of Mg 2 Si phase on tear toughness, tear toughness tests were performed for Al-13%Mg 2 Si pseudo-binary alloy cast products produced by permanent mold casting and high-speed twin-roll casting. Unit crack propagation energy (UEp) of the high-speed twin-roll cast products was 5 times higher than that of permanent mold cast products. For permanent mold cast specimens, crack propagation occurred along the interface of plate-like Mg 2 Si/ matrix of the eutectic solidified region and in Al-matrix. But fracture surface of high-speed twin-roll cast specimens was covered with fine dimples. Such difference of fracture mode is due to morphological change of Mg 2 Si phase from plate-like to globular by rapid cooling.

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Section: Discussionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 89%

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Effect of Cooling Rates during Solidification of Al-5.5%Mg-2.3%Si-0.6%Mn and Al-13%Mg<SUB>2</SUB>Si Pseudo-Binary Alloys on Their Secondary-Particle Morphology and Tear Toughness

Shimosaka

Kumai

Casarotto³

et al. 2011

Mater. Trans.

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“…U saglasnosti sa slikom 6, UIE za leguru 1050A je mnogo veća za osnovni materijal nego za metal šava, videti sliku 7a. Ovo je verovatno zbog potpunog gubitka efekata obrade na hladno i stoga čvrstoće tokom TIG zavarivanja što je takođe saopšteno pri merenju tvrdoće i ispitivanju zatezanjem za leguru 1050A, poziv na Jedinica energije potrebna za naknadno širenje prsline do loma (UPE) predstavlja otpornost cepanju materijala [19] i takođe se shvata kao mera udarne žilavosti [44,54]. Slika 8 pokazuje dobijene vrednosti UPE koje potvrđuju potpuno različito prostiranje prslina u ove dve legure: otpornost na širenje prsline je mnogo veća u osnovnom materijalu od 5083 (171 N/mm) nego u osnovnom materijalu od 1050A (98 N/mm).…”

Section: žIlavostunclassified

“…Bez obzira na to, fina zrna često daju veću žilavost [19], kao što je prikazano u npr. studiji o Al livenim legurama -legura Al Si7Mg [54].…”

Section: žIlavostunclassified

Continued from previous issue: Influence of grain size on mechanical properties of aluminium GTA weld metal

Schempp¹,

Häcker²,

Pittner³

et al. 2015

Zavarivanje i zavarene konstrukcije

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ŽilavostŽilavost osnovnog materijala i metala šava legura 1050A i 5083 određena je pri ispitivanju cepanjem. Slika 6 pokazuje dobijene krive sila-pomeranje, gde je svaka kriva, srednja vrednost 6 različitih ispitivanja cepanjem. Kao što se očekivalo, maksimalna opterećenja su bila niža kod epruveta od legure 1050A (slika 6a) nego kod legure 5083 (slika 6b) s obzirom na nižu čvrstoću legure 1050A u poređenju sa legurom 5083. Štaviše, razlika u žilavosti između osnovnog materijala i metala šava je veća za leguru 1050A i manja za leguru 5083. Iz svake krive silapomeranje, jedinice energije UIE i UPE su računate prema jednačinama (2) i (3). Srednja vrednost energije potrebne za nastanak prsline (UIE) prikazana je na slici 7. UIE je mera za zareznu žilavost [19]. U saglasnosti sa slikom 6, UIE za leguru 1050A je mnogo veća za osnovni materijal nego za metal šava, videti sliku 7a. Ovo je verovatno zbog potpunog gubitka efekata obrade na hladno i stoga čvrstoće tokom TIG zavarivanja što je takođe saopšteno pri merenju tvrdoće i ispitivanju zatezanjem za leguru 1050A, poziv na delove 3.2 i 3.3. Rezultujuće smanjenje UIE od osnovnog materijala ka metalu šava bio je samo blago izražen kod legure 5083, videti sliku 7b. Ovo se može objasniti vrlo malim stepenom obrade na hladno osnovnog materijala lima 5083 (manje od ⅛ tvrd) u poređenju sa hladno obrađenim osnovnim materijalom 1050A (½ tvrd). U odnosu na osnovni materijal, legura 1050A pokazuje veću otpornost na nastanak prslina (64 N/mm) nego legura 5083 (53 N/mm), što se ne reflektuje na različite čvrstoće obe legure (legura 1050A: 108 MPa, legura 5083: 143 MPa). Štaviše, rafinacija zrna znatno povećava vrednosti UIE metala šava za leguru 1050A, dok je taj efekat zanemarljiv za leguru 5083. Da bi se ovo objasnilo, mora se pozvati na to da je smanjenje srednje vrednosti veličine zrna bilo više izraženo u metalu šava od 1050A (-86%) nego u metalu šava od 5083 (-44%), poziv na sliku 3. Prečnik zareza kao značajan uticajni faktor vezan za nastanak prslina, meren je na svakoj epruveti pre ispitivanja i njegove vrednosti su bile u intervalu 0.05 i 0.15 mm za sve epruvete od obe legure. Sistemski uticaj prečnika zareza na UIE, međutim, nije nađen.

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Development of Al/SiC metal matrix composite by using stir casting method

Kumar,

Reema,

Kumar

2024

Biopolymer, Smart Materials and Engineering Materials

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Tear Toughness Evaluation of a Permanent Mold Cast A356 Aluminum Alloy Using a Small-size Specimen

Cited by 13 publications

References 5 publications

Effect of Cooling Rates during Solidification of Al-5.5%Mg-2.3%Si-0.6%Mn and Al-13%Mg<SUB>2</SUB>Si Pseudo-Binary Alloys on Their Secondary-Particle Morphology and Tear Toughness

Effect of Cooling Rates during Solidification of Al-5.5%Mg-2.3%Si-0.6%Mn and Al-13%Mg<SUB>2</SUB>Si Pseudo-Binary Alloys on Their Secondary-Particle Morphology and Tear Toughness

Continued from previous issue: Influence of grain size on mechanical properties of aluminium GTA weld metal

Development of Al/SiC metal matrix composite by using stir casting method

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