The effect of some additives on some properties of Al-Si alloys of eutectic composition

Dissertant

Shukr, Rabab Hamid

Thesis advisor

al-Khazraji, Qahtan Khalaf

University

University of Technology

Faculty

-

Department

Department of Materials Engineering

University Country

Iraq

Degree

Master

Degree Date

2010

English Abstract

The Present work encompasses the effect of some additives of wt (TiO2 & ZrO2.Y2O3) with a fixed amount of MgO about (1.0 % wt) on microstructure and some mechanical properties of the eutectic Al-12 % wt Si alloy.

The addition of 0.4 % wt TiO2, 0.6 % wt ZrO2.Y2O3 and 0.1 % wt of MgO had revealed the best modification compared with the other percentages of the mentioned additions, i.e.

the hardness about (24.49 BH) with lower wear rate of (7.5*10-9 cm3.cm-1) and a maximum value of impact resistance of (0.053 J / mm2) with tensile strength about (100 Mpa Also the research studies the effect of adding 2 %wt of (CaCl2 & CaF2) or CaF2 alone on grain refinement of the eutectic Al-Si alloy.

It was found that the addition of (CaCl2 & CaF2) had refined the eutectic phase in the Al-12 %wt Si alloy and revealed lower wear rate i.e.

(6*10-9 cm3.cm-1) and hardness was (39.70 BH).

Furthermore, the maximum value occurred in the impact resistance by adding 2 % wt of CaF2 with CaCl2 to the molten eutectic Al-Si alloy, i.e.

(0.0516 J / mm2) and ultimate tensile strength of (117 Mpa).

Main Subjects

Materials Science , Minerals

Topics

• Mechanical properties
• Aluminum alloys
• Aluminum-silicon alloys

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305120