Modification of the Al-9%SiMg Alloy with Aluminum, Boron, and Titanium Fast Cooled Mixtures

Lipiński, T.

doi:10.12693/aphyspola.130.982

Cited by 7 publications

(3 citation statements)

References 13 publications

(15 reference statements)

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“…They are the reason for the low mechanical properties of alloys. For many years, a number of technological procedures have been known to refine the microstructure and, at the same time, increase the mechanical properties resulting from the microstructure [12][13][14][15][16][17][18][19][20][21][22]. Hypoeutectic silumins are one of the few alloys in which, as a result of changes in the microstructure, it is possible to increase all mechanical properties, e.g., tensile strength and elongation, at the same time.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Proportions of Titanium and Boron in the Al and AlSi7-Based Master Alloy on the Microstructure and Mechanical Properties of Hypoeutectic Silumin, AlSi7Mg

Lipiński

2023

Applied Sciences

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Unmodified hypoeutectic silumins have a microstructure composed of large-sized phases, which are the reason for their low mechanical properties. Many years of research have shown the modifying effects of many chemical elements and their compounds, including the master alloy consisting of Al-Ti-B, often in the form of the finished AlTi5B alloy. In this work, it was decided to check how the proportions of Ti and B content in the Al or AlSi-based master alloy affect the microstructure and mechanical properties of a hypoeutectic silumin, AlSi7Mg. It has been shown that a master alloy containing silicon (with the participation of Al + Ti + B) has a more effective impact on the refinement of the microstructure, and thus an increase in the mechanical properties of the AlSi7Mg alloy, than a master alloy without silicon. It has been shown that the ratio of titanium to boron content in the very-often-used AlTi5B modifier is not always optimal. It has been shown that the use of a master alloy with a composition similar to that of modified silumin with titanium and boron in a 2:1 ratio allows the obtaining of an AlSi7Mg alloy with higher mechanical properties than the alloy after the modification of the AlTi5 master alloy.

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Section: Introductionmentioning

confidence: 99%

The Influence of the Proportions of Titanium and Boron in the Al and AlSi7-Based Master Alloy on the Microstructure and Mechanical Properties of Hypoeutectic Silumin, AlSi7Mg

Lipiński

2023

Applied Sciences

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“…In industrial conditions, modification is carried out with mixtures of one of these two elements (mainly strontium) and salts of various metals. The composition of the mixtures used in industrial conditions to modify silumins remains known only to the alloy manufacturer [19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Modification of AlSi7Mg alloy with Sr and Sb

Lipiński

Pietraszak

2023

22nd International Scientific Conference Engineering for Rural Development Proceedings

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Hypoeutectic aluminum-silicon alloys called hypoeutectic silumins have been used for foundry structural elements. Their properties depend directly on the microstructure. They are one of the few metal alloys that are characterized by a simultaneous increase in strength and elongation. This is possible by changing the shape of the eutectic silicon precipitates from the lamellar form to the dendritic or, less frequently, spheroidal form. Hard and at the same time brittle silicon plates are natural notches occurring in silumins. They are also places of nucleation and development of microcracks leading to the destruction of the material. Modification of the shape of this unfavourable phase to an oval shape leads to an increase in the properties of the alloy. A number of silumin modification processes are known in the literature. These processes can be divided into technological ones, in which the geometric form of eutectic silicon is changed, e.g. by controlling the crystallization of the alloy by means of a temperature gradient. The second group of processes are chemical modification processes. During these processes, chemical additives introduced into the liquid alloy by affecting the crystallization process cause changes in the microstructure. The influence of a very large number of chemical elements on the alloy crystallization process is known. Unfortunately, among so many reports, there is contradictory information about the impact of individual additives. In this work, it was decided to check the repeatability of the test results found in the literature in other technological conditions. Typical hypoeutectic silumin containing 7% silicon with the addition of magnesium was tested. The alloy was modified only with antimony and a double modification consisting in modification with strontium and then with antimony was carried out. The contents of antimony and strontium were taken from the literature. As a result of the tests, it was noticed that the addition of antimony leads to the modification of the microstructure, and thus to the increase of the mechanical properties of the alloy. After double modification with strontium and then with antimony, changes in mechanical properties oscillating around the measurement error were obtained. It can therefore be assumed that modification of the alloy with antimony after prior permanent modification with strontium is not very effective.

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“…There are many salts and chemical compounds 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 [36][37][38][39][40][41][42][43][44]. There are well known other technological processes, too [45][46][47][48][49][50][51].…”

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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Modification of the Al-9%SiMg Alloy with Aluminum, Boron, and Titanium Fast Cooled Mixtures

Cited by 7 publications

References 13 publications

The Influence of the Proportions of Titanium and Boron in the Al and AlSi7-Based Master Alloy on the Microstructure and Mechanical Properties of Hypoeutectic Silumin, AlSi7Mg

The Influence of the Proportions of Titanium and Boron in the Al and AlSi7-Based Master Alloy on the Microstructure and Mechanical Properties of Hypoeutectic Silumin, AlSi7Mg

Modification of AlSi7Mg alloy with Sr and Sb

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

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