The Microstructure and Mechanical Properties of Al-7%SiMg Alloy Treated with a Exothermic Modifier Contained Na and B

Lipiński, T.; Bramowicz, Mirosław; Szabracki, Paweł

doi:10.4028/www.scientific.net/ssp.203-204.250

Cited by 9 publications

(10 citation statements)

References 3 publications

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“…Niekorzystne właściwości mechaniczne siluminów podeutektycznych można poprawić poprzez zastosowanie procesu modyfikacji, obróbki cieplnej, procesów technologicznych [1][2][3][4][5][6][7][8][10][11][12]. W efekcie modyfikacji uzyskuje się, wynikające z rozdrobnienia mikrostruktury, polepszenie właściwości mechanicznych.…”

Section: Wprowadzenieunclassified

“…Nie ma wów-czas potrzeby dbania o czystość chemiczną stopu, który i tak jest zanieczyszczony modyfikatorami pozostawiającymi trwały efekt. Można wówczas zastosować między innymi modyfikację związkami chemicznymi dającymi efekt egzotermiczny [4,5]. Zastosowanie tego rodzaju, również niekonwencjonalnej, metody modyfikacji umożliwia dodatkowo wprowadzenie do ciekłego stopu pierwiastków i związków chemicznych powodujących poprawę jego właściwości użytkowych.…”

Section: Wprowadzenieunclassified

“…Porównując wyniki badań z wynikami prac [4,5] stwierdzono, że pomimo korzystnego wpływu reduktorów w mieszance oraz mieszanki dającej efekt egzotermiczny na mikrostrukturę i właściwości modyfikowanego stopu, efektywność oddziaływania efektu cieplnego na zmianę mikrostruktury zależy od zastosowanych związków chemicznych. Należy sądzić, że efekt egzotermiczny może powodować poprawę właściwości stopów do pewnego zakresu, właści-wego dla stopu oraz składników mieszanki egzotermicznej, po przekroczeniu, którego jego efektywność maleje lub wręcz pogarsza właściwości stopu.…”

Section: Wyniki Badań I Ich Analizaunclassified

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The reducer efficiency effect contained in exothermic mixture on alloy`s properties

Lipiński¹

2015

Mechanik

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Section: Wprowadzenieunclassified

Section: Wyniki Badań I Ich Analizaunclassified

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The reducer efficiency effect contained in exothermic mixture on alloy`s properties

Lipiński¹

2015

Mechanik

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“…This microstructure is the reason for the low mechanical properties of the alloys [1-3; 5]. Increasing the properties of alloys can be achieved through an appropriately designed crystallization process [11][12][13], modification [14][15][16], through the use of appropriate technological processes: plasma [17], welding [18], homogeneous modifying [19]. For economic reasons the structure [20] and microstructure [21] of alloys are tested and simulation properties of alloys using numerical methods [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti and B additions as powder and preliminary alloy with Al-Si alloy on microstructure and mechanical properties of AlSi9Mg alloy intended for parts of agricultural machinery

Lipiński

Karpisz

2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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Foundry aluminum silicon alloys are widely used in various industries. In their unmodified state, they are not used for construction materials. Their use is possible after improving the unfavourable microstructure. Initially, the microstructure of hypoeutectic silumins is composed of a large primary α-phase and large, sharpshaped eutectic silicon grains. This phase creates microstructural notches. This microstructure is the reason for the low mechanical properties of the alloy. Increasing the properties of hypoeutectic silumins can be achieved, inter alia, by introducing chemical additives into the alloy, which refine the microstructure. There are reports in the literature on the use of various chemical compounds and technologies aimed at fragmenting the microstructure. A new approach is the modification process using a homogeneous modifier. This process does not introduce new alloying elements into the alloys. However, this process did not fragment the primary α-phase. The paper presents the results of AlSi9Mg alloy modification with AlSi9Mg alloy and boron and titanium. The test results confirm the effectiveness of the applied treatment. After it was carried out, the α + β eutectic and the primary α phase were fragmented. These changes, represented by the fragmentation of the microstructure, turned out to be correlated with an increase in the tensile strength of the alloy and its plasticity. The highest mechanical parameters (Rm = 195 MPa and A = 6.5%) were obtained for the alloy with 0.6% Al-Si + 0.15% Ti + 0.06% B.

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“…The modern construction material for components of work machines and vehicles must meet rigorous parameters regarding weight reduction, stability of material parameters, strength, corrosion resistance and surface quality. There are many alloys meeting the above criteria [9][10][11]. However, the Al-Si cast alloys are very attractive mainly because of their low density, good castability, high corrosion resistance, good thermal conductivity and durability [1; 11-19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ti and melt number on microstructure and mechanical properties of Al-Si alloy on agriculture machine parts

Lipiński

2018

Engineering for Rural Development

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Reducing the weight of the structure promotes improved machine performance and reduced fuel consumption. This can be achieved by optimizing the construction and use of light materials. It is the reason why aluminum is growing in popularity, mainly in the automotive industry and working machines, including agriculture. Al-Si alloys are still very popular mainly due to low density and high corrosion resistance. In order to reduce production costs, more and more machine parts are produced using the casting method. This favors the increase in the popularity of hypo-eutectic silumins. Among hypo-eutectic Al-Si alloys Al-9 %SiMg alloy is often used. Its raw microstructure consists of the plastic α phase and the large grains and needles of the undeformable β phase, which is the natural notch in the microstructure. This microstructure promotes the tendency to cracking the alloy. Through the modification process it is possible to fragmentation the beta phase and thus the plasticization of the alloy. By this method, the problem can be solved at the first melting. The market economy enforces the recovery of alloys and the use of waste from foundry production, such as risers, the gating system, castings with big defects, etc. It is then necessary to re-melt the alloy. It is uncertain whether the originally obtained microstructure, and therefore also the properties of the melts after a few melts, will not be adversely affected. Many salts and chemical compounds are used in the industry for modification. There is known modifying activity of such elements as: Na, Ca, K, Li, Ce, Te, Sr, Sb, Ti, B. Some of them have a permanent effect, but for most of them the effect of modification decreases with the time of holding the alloy in the liquid state and as expected, with the number of melts. With the number of melts also increases the holding time of the alloy in the liquid state. This paper presents the results of different ranges of Ti as a modification addition and melt number of the Al-9 %SiMg alloy. The effect of the Ti modifier on the microstructure, mechanical properties on the alloy was presented in graphs. As the research results showed the modification of a hypo-eutectic Al-9 %SiMg alloy firstly improved the alloy's properties, but with an increased number of melt the microstructure and mechanical properties were decreased.

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The Microstructure and Mechanical Properties of Al-7%SiMg Alloy Treated with a Exothermic Modifier Contained Na and B

Cited by 9 publications

References 3 publications

The reducer efficiency effect contained in exothermic mixture on alloy`s properties

The reducer efficiency effect contained in exothermic mixture on alloy`s properties

Effect of Ti and B additions as powder and preliminary alloy with Al-Si alloy on microstructure and mechanical properties of AlSi9Mg alloy intended for parts of agricultural machinery

Influence of Ti and melt number on microstructure and mechanical properties of Al-Si alloy on agriculture machine parts

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