Saadi Habib

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Participant: PROMISE AGEP Research Symposium


Saadi Habib
Department
: Mechanical Engineering
Institution: University of Maryland, Baltimore County (UMBC)

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PROMISE AGEP Research Symposium 2015

ABSTRACT

Application and mechanical response of magnesium alloy ZEK100

Magnesium alloy is a highly sought after material due to its light weight and strength properties. It’s about 75% lighter than steel and about 35% lighter than aluminum. However, magnesium alloy sheet has a limited number of slip planes at room temperature and where twinning is a significant contributor to deformation due to hexagonal close packed (HCP) crystal structure. Also, it shows strong crystallographic texture due to material forming which causes strong anisotropic and asymmetric behavior. Magnesium alloy ZEK100 sheet shows significant improvement in crystallographic texture due to the addition of rare earth elements. The results of the weaker crystallographic texture are an increase in ductility. To be able to use this material in automotive and aerospace industry, mechanical response of the material under different load speeds and temperature must be tested. Mechanical responses of ZEK100 Magnesium alloy under uniaxial (tension-compression) loadings along the rolling direction (RD), 45° to rolling direction (DD), transverse direction (TD) and normal direction (ND) at the strain rate and temperature ranges of 10-4 – 3200 s-1 and 23°C & 150°C are presented. The mechanical response of the material will help in understanding how the material reacts in metal forming, under load and under impact. The material is dependent on strain rate, temperature and orientation. The yield strength is greatest along the RD and decreases towards TD whereas elongation is highest in the TD and decreases in the RD.

 

PROMISE AGEP Research Symposium 2014

ABSTRACT

Anisotropy and strain rate sensitivity of magnesium alloy ZEK100 at different strain rates and temperature

Mechanical response of magnesium alloy ZEK100 in sheet was tested under uniaxial (tension and compression) loading along the rolling direction (RD), 45° to rolling direction (DD), and transverse direction (TD) at strain rates of 10-4 to 2.4×103 s-1 and at temperature of 25 and 150°C. Magnesium alloy sheet has hexagonal close packed (HCP) crystal structure and crystallographic texture due to material sheet forming causing strong anisotropic and asymmetric behavior. Data shows yielding and strain hardening is dependent on strain rate and temperature in addition to orientation. The yield strength is the greatest along the RD and decreases towards TD. Jump test and monotonic test where also used to find strain rate sensitivity (SRS) along three different directions. Results show SRS to vary depending on strain, strain rate jump and direction of loading.

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BIOGRAPHICAL SKETCH

Throughout my life, I loved taking things apart and trying to understand how they worked. Before I entered college, I knew that engineering is what I wanted to do. I started college at Anne Arundel Community College to save money and where I had great professors that pushed me. I transferred to University of Maryland, Baltimore County (UMBC) after finishing my second year where I graduated spring 2013 with my mechanical engineering degree. Toward my last year of my undergrad, I realized that I wanted to learn more then what was capable at an undergrad level. This is when I decided that I had to continue my education by going to graduate school. I started graduate school at UMBC fall 2013, working on my masters in mechanical engineering with my research in solid mechanics and plasticity of magnesium alloys.

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GENERAL SUMMARY OF GRADUATE RESEARCH

Due to an increase awareness of global warming and increase in oil price, light weight material are in a demand. Magnesium alloys are one material that extensive amount of research is needed in understanding its mechanical and atomistic response especially in the highly sought after sheet and extruded material. Sheet and extruded magnesium alloys show better mechanical properties when compared to casting, however show strong basal texture that are developed during manufacturing (the basal plane tends to form parallel to the die surface). As a result, the material has significant anisotropy and asymmetry properties (different material properties in the x, y and z direction and in tension and compression). My research is in testing and modeling the mechanical response of the material in sheet magnesium alloy ZEK100. With an interest in plastic deformation of magnesium alloys related to high impact loading and model manufacturing formability and crashworthiness of the material. This type of research is extremely important in the automotive industry where sheet material will be useful.

SELECTED LIST OF PRESENTATIONS AND PUBLICATIONS

  1. 21st International Symposium on Plasticity and Its Current Applications, 2015. Montego Bay, Jamaica. Oral Presentation: Mechanical response of Magnesium alloy ZEK100 at different strain rates and temperatures
  2. PROMISE Research Symposium, 2014. University of Maryland, College Park. Poster Presentation: Anisotropy, Asymmetry and Strain Rate Sensitivity of Magnesium Alloy ZEK100 Sheet
  3. UMBC Graduate Research Conference, 2014. University of Maryland, Baltimore County.  Poster Presentation and Session Winner: Anisotropy, Asymmetry and Strain Rate Sensitivity of Magnesium Alloy ZEK100 Sheet
  4. UMES Regional Research Symposium, 2014. University of Maryland, Eastern Shore. Oral Presentation: Anisotropy, Asymmetry and Strain Rate Sensitivity of Magnesium Alloy ZEK100 Sheet

 

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