Profile Details

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Hire Dr. Yordan K.

Bulgaria

USD 140 /hr

Dr.-Ing. Materials Scientist & Process Engineer | Expert in Superalloys, Semiconductors & Advanced Data Analysis

Profile Summary

I am a Doctor of Engineering (Dr.-Ing.) in Materials Science with over 8 years of experience at the intersection of high-performance metallurgy, semiconductor technology, and statistical process control. I specialize in solving complex R&D challenges where material properties limit engineering performance. Core Expertise: Specialized Expertise based on Doctoral Research: High-Entropy Alloys (HEAs) & Phase Stability: Deep knowledge of multicomponent systems (quinary alloys). Expert in predicting and analyzing deleterious phases (e.g., Sigma phase) using DSC (Differential Scanning Calorimetry) and heat treatment protocols.Small-Scale Mechanics & Fracture Toughness: Proficiency in estimating Fracture Toughness ($K_{Ic}$) and hardness of extremely brittle materials using Nanoindentation, eliminating the need for bulk tensile specimens.Failure Analysis: Root cause analysis of thermal stress cracking due to elastic anisotropy and grain boundary incompatibilities. Thin Films & Semiconductors: Proven track record in process validation and characterization of thin-film systems. Expert in Nanoindentation and high-precision metrology. Equipment Commissioning: Experience in leading Factory Acceptance Tests (FAT) and Site Acceptance Tests (SAT) for complex analytical setups (e.g., Hysitron systems). Data Science for Engineering: Proficient in using Python and statistical algorithms to analyze large experimental datasets, perform risk assessments (FMEA), and optimize manufacturing parameters. Whether you need a rigorous technical feasibility study, a root-cause analysis for a failing component, or experimental design (DoE) optimization, I bring "German Engineering" discipline combined with flexible, remote-first consulting.

Subject Matter Expertise

• ★ Metallurgy
• ☆ Materials Science & Engineering
• ☆ Nanotechnology & Nanomaterials
• ☆ Ceramic Engineering
• ☆ Corrosion
• ☆ Aerospace Engineering
• ☆ Electrical Engineering
• ☆ Semiconductors
• ☆ Mechanical Engineering
• ☆ Tribology
• ☆ Data Analysis
• ☆ Image Processing
• ☆ Data Processing
• ☆ Statistics
• ☆ Applied Statistics
• ☆ Study Design
• ☆ Trend Analysis
• ☆ Risk Assessment & Actuarial Science
• ☆ German
• ☆ Technical & Scientific Writing
• ☆ Manuscript & Journal Article Writing
• ☆ Experimental Protocols
• ☆ Project Management

Services

• Writing
• Research
• Consulting
• Data & AI
• Product Development

Writing Non-Medical Regulatory Writing, Technical Writing

Research Market Research, Feasibility Study, Technology Scouting, Gap Analysis, Scientific and Technical Research, Systematic Literature Review

Consulting Business Strategy Consulting, Operations Consulting, Scientific and Technical Consulting, Financial Consulting, Manufacturing Consulting

Data & AI Predictive Modeling, Statistical Analysis, Data Visualization

Product Development Product Evaluation, Product Validation, Manufacturing, Quality Assurance & Control (QA/QC), Concept Development, Prototyping, Reverse Engineering, Device Fabrication

Work Experience

Independent Technical Consultant

Freelancer

October 2023 - Present

Co-Owner, Co-Founder

FinTech Start-up (Bulgaria)

January 2024 - September 2025

PostdoctoralResearcher

Ruhr-Universität Bochum

July 2022 - July 2023

Researcher, Research Associate

Ruhr-Universität Bochum

June 2018 - June 2022

Graduate Research Assistant / Research Assistant

Ruhr-Universität Bochum

January 2017 - June 2018

Interniship

Bonago GmbH

October 2016 - December 2016

Reaearch Assistant

Ruhr-Universität Bochum

April 2016 - September 2016

Education

Dr.-Ing.

Ruhr-Universität Bochum - Germany

June 2018 - July 2022

M.Sc. Sales Engineering and Product Management

Ruhr-Universität Bochum - Germany

November 2015 - May 2018

B.Sc. Sales Engineering and Product Management

Ruhr-Universität Bochum - Germany

October 2011 - October 2015

Certifications

• Cambridge English Business Higher (BEC)

  Cambridge Assesment English

  https://www.cambridgeenglish.org/why-choose-us/higher-education-institutions/how-to-verify-results-online/

  May 2019 - Present

• Cambridge Advanced English Certificate

  Cambridge Assesment English

  https://www.cambridgeenglish.org/why-choose-us/higher-education-institutions/how-to-verify-results-online/

  December 2018 - Present

• SAP Certified Associate - Business Process Integration with SAP ERP 6.0

  SAP Global Certification

  April 2016 - Present

• Prince2 Foundation

  People Cert

  March 2024 - March 2026

Publications

JOURNAL ARTICLE

Yordan Kalchev, Jean-Marc Joubert, Andrea Fantin, Jean-Claude Crivello, Rico Zehl, Erik Elkaim, Guillaume Laplanche (2023). Site occupancies in a chemically complex σ-phase from the high-entropy Cr–Mn–Fe–Co–Ni system . Acta Materialia.

Yordan Kalchev, Jingfeng Zhang, G. Mohan Muralikrishna, Alex Asabre, Julian Müller, Benjamin Butz, Sven Hilke, Harald Rösner, Guillaume Laplanche, Sergiy V. Divinski, et al.(2021). Tracer diffusion in the σ phase of the CoCrFeMnNi system . Acta Materialia. 203. p. 116498. Elsevier {BV}