Unsteady‑State Horizontal Solidification of an Al–Si–Cu–Fe Alloy: Relationship Between Thermal Parameters and Microstructure with Mechanical Properties/Fracture Feature

다국어 초록 (Multilingual Abstract)

Aluminum casting alloys have properties which are of great industrial interest, such as low density, good corrosion resistance,high thermal and electrical conductivities, good combination of mechanical properties, good workability in machiningprocesses and mechanical forming. Currently, these alloys are produced in various systems and dozens of compositions. Inthis investigation, a mutual interaction of thermal parameters, scale of the dendritic microstructure, intermetallic compounds(IMCs), microhardness and tensile properties/fracture characteristics of a casting Al–7wt%Si–3wt%Cu–0.3wt%Fe alloywas analyzed. Solidification experiments were developed using a furnace that promoted horizontal growth under transientheat flow conditions. Then, growth rate (VL), cooling rate (CR), and local solidification time (tSL) were determined frommeasured temperature profiles. Secondary dendritic spacings (λ2), Si particles, Fe-rich and Al2Cuintermetallic phases werecharacterized by optical and SEM microscopy, as well as the area mapping and point-wise EDS microanalysis. Hence, theinterrelations involving Vickers microhardness (HV), yield strength (σYS), ultimate tensile strength (σUTS) and elongation(E%) with microstructural features were evaluated by mathematical equations. IMCs as well as morphologies of Si were alsoanalyzed in the fracture regions. In addition, the experimental growth law of λ2 = f(tSL) proposed in this study was comparedwith a predictive theoretical model reported in the literature for multicomponent alloys. It was observed that areas that tendto grow faster (lowest λ2 values) were associated with the highest σUTS and E% values, while HV and σYS properties were notaffected by the thermal and microstructural parameters (CR and λ2). In addition, less extensive cleavage planes accompaniedby small dimples in were observed in fractured samples with lower λ2 values.

참고문헌 (Reference)

1 A. T. R. Franco, 21 : 1-8, 2018

2 A.M. Samuel, 11 (11): 552-567, 2017

3 A. M. Samuel, 30 : 4823-4833, 1995

4 Z. Li, 367 : 96-110, 2004

5 A. H. Musfirah, 8 : 4865-4875, 2012

6 D. L. Soares, 12 : 413-428, 2017

7 W. R. Osório, 6 : 6275-6289, 2011

8 W. R. Osório, 56 : 8412-8421, 2011

9 E. C. Araújo, 48 : 1163-1175, 2017

10 E. Sjölander, 210 : 1249-1259, 2010

11 E. H. Samuel, 30 : 893-901, 1996

12 A. M. Samuel, 105 : 951-962, 1997

13 A. M. Samuel, 27 : 1785-1798, 1996

14 Z. Li, 38 : 1203-1218, 2003

15 Y. M. Han, 116 : 79-90, 2008

16 M. F. Ibrahim, 32 : 2130-2142, 2011

17 O. L. Rocha, 34 : 995-1006, 2003

18 D. Bouchard, 28 : 651-663, 1997

19 J. D. Hunt, 173 : 79-83, 1993

20 H. Kaya, 34 : 707-712, 2012

21 R. Trivedi, 34 : 395-401, 2003

22 E. Çadırlı, 694 : 471-479, 2017

23 M. Gündüz, 327 : 167-185, 2002

24 H. Kaya, 255 : 3071-3078, 2008

25 D. B. Carvalho, 16 : 874-883, 2013

26 M. D. Peres, 381 : 168-181, 2004

27 O. L. Rocha, 361 : 111-118, 2003

28 F. Sá, 373 : 131-138, 2004

29 C. Brito, 46 : 3342-3355, 2015

30 R. Chen, 685 : 391-402, 2017

31 T. A. Costa, 683 : 485-494, 2016

32 A. J. Vasconcelos, 88 : 1099-1111, 2016

33 T. A. Costa, 31 : 1103-1112, 2015

34 D.J. Moutinho, 730–732 : 883-888, 2013

35 M. Rappaz, 47 : 3205-3219, 1999

36 R. Chen, 24 : 1645-1652, 2014

37 T. Okamoto, 129 : 137-146, 1975

38 W. Kalifa, 19 : 156-166, 2006

39 J. A. Taylor, 1 : 19-33, 2012

40 L. Liu, 40 : 2457-2469, 2009

41 M. A. Moustafa, 209 : 605-610, 2009

42 C. M. Dinnis, 37 : 3283-3291, 2006

43 C. M. Dinnis, 425 : 286-296, 2006

44 Z. Ma, 490 : 36-51, 2008

45 N. Roy, 27 : 415-429, 1996

46 C. Puncreobutr, 68 : 42-51, 2014

47 R. V. Reyes, 685 : 235-243, 2017

48 P. R. Goulart, 421 : 245-253, 2006

49 K. Liu, 43 : 1231-1240, 2012

50 André Santos Barros, "Measurements of Microhardness During Transient Horizontal Directional Solidification of Al-Rich Al-Cu Alloys: Effect of Thermal Parameters, Primary Dendrite Arm Spacing and Al2Cu Intermetallic Phase" 대한금속·재료학회 21 (21): 429-439, 2015

51 I.J. Polmear, "Light Alloys: From Traditional Alloys to Nanocrystals" Elsevier Butterworth-Heinemann 2006

52 Ashutosh Sharma, "Influence of Various Additional Elements in Al Based Filler Alloys for Automotive and Brazing Industry" 대한용접접합학회 34 (34): 1-8, 2015

53 Emin Çadırlı, "Effect of Solidification Parameters on Mechanical Properties of Directionally Solidified Al-Rich Al-Cu Alloys" 대한금속·재료학회 19 (19): 411-422, 2013

54 M. Warmuzek, "Aluminum–Silicon Casting Alloys: An Atlas of Microfractographs" ASM International 2004

55 B. Altshuller, "Aluminum Brazing Handbook" The Aluminum Association Inc 1990

56 ASM International, "ASM Handbook: Volume 12: Fractography, 9th edn" ASM International 1987