تأثیر سرعت حرکت پین بر ریزساختار، خواص مکانیکی و زیست سازگاری کامپوزیت‌های سطحی Ti/HA ساخته شده به روش FSP
محورهای موضوعی : روش ها و فرآیندهای نوین در تولیدامیرحسین شهباز 1 , مهرداد عباسی 2 * , حامد ثابت 3
1 - گروه مهندسی مواد و متالورژی، واحد کرج، دانشگاه آزاد اسلامی، کرج، ایران.
2 - گروه مهندسی مواد و متالورژی، واحد کرج، دانشگاه آزاد اسلامی، کرج، ایران.
3 - گروه مهندسی مواد و متالورژی، واحد کرج، دانشگاه آزاد اسلامی، کرج، ایران.
کلید واژه: جوشکاری اصطکاکی اغتشاشی سرعت خطی تیتانیوم هیدروکسی آپاتیت خواص فیزیکوشیمیایی,
چکیده مقاله :
تیتانیوم یکی از مهم‌ترین عناصر فلزی است که در بسیاری از صنایع از جمله هوافضا، پزشکی و خودروسازی استفاده می‌شود. از سوی دیگر هیدروکسی آپاتیت (HA) یکی از مهم‌ترین مواد استفاده شده در صنایع پزشکی برای جایگزینی استخوان‌های آسیب‌دیده است. این مطالعه به بررسی اثر ریزساختار بر خواص مکانیکی و زیست سازگاری کامپوزیت‌های سطحی Ti/HA ساخته شده با استفاده از روش جوشکاری اغتشاشی اصطکاکی (FSP) می‌پردازد. ریزساختار با سرعت‌های مختلف 25-70 میلی‌متر در دقیقه تغییر یافت. مطالعات ریزساختاری نشان داد که سرعت‌های سرعت خطی کمتر (25-40 میلی‌متر در دقیقه) در مقایسه با سرعت‌های بالاتر (50-70 میلی‌متر در دقیقه) منجر به نقص‌های کمتری مانند حفره‌ها و ترک‌ها می‌شود. توزیع ناهمگن‌تر ذرات HA در ماتریس Ti در سرعت‌های سرعت خطی بالاتر به دلیل اثرات چرخش و نرخ سرد شدن بالاتر مشاهده شد. بررسی‌های مکانیکی نشان داد که استحکام کششی نهایی با افزایش سرعت خطی کاهش می‌یابد. مقادیر 25، 40، 55 و 70 میلی‌متر بر دقیقه به ترتیب 865 مگاپاسکال،748 مگاپاسکال،756 مگاپاسکال و 540 مگاپاسکال با انحراف معیار ± 4 درصد به دست آمد. همه نمونه‌ها زیست سازگاری بالایی از خود نشان دادند، اما بیشترین زیست سازگاری سلول‌ها در نمونه تولید شده با سرعت 70 میلی‌متر در دقیقه بود که دارای مقدار بیشتری نقص و تجمع سطحی ذرات HA بود که بر رشد و تکثیر سلولی تأثیر می‌گذاشت. این یافته‌ها نشان می‌دهد که چگونه شرایط فرایند می‌تواند به‌طور قابل‌توجهی بر خواص مواد از جمله زیست سازگاری سلول در طول زمان تأثیر بگذارد.
Titanium is one of the most important metal elements used in many industries including aerospace, medicine, and automotive. On the other hand, hydroxyapatite (HA) is one of the most important materials used in the medical applications to replace damaged bones. This research explored the influence of microstructure on the mechanical, electrochemical, and biological characteristics of Ti/HA surface composites created through the FSP method. The microstructure was modified by varying traverse speeds within the range of 25–70 mm/min. Examination of the microstructure revealed that lower traverse speeds (25–40 mm/min) resulted in fewer defects such as voids and cracks compared to higher speeds (55–70 mm/min). Higher traverse speeds led to a more heterogeneous distribution of HA particles in the Ti matrix due to increased stirring effects and cooling rates, resulting in more voids and cracks. Mechanical assessments indicated a decrease in ultimate tensile strength with increasing traverse speed. The values for samples at 25, 40, 55, and 70 mm/min were recorded as 865 MPa, 748 MPa, 756 MPa, and 540 MPa, respectively, with a ± 4% standard deviation. While all samples exhibited high biocompatibility, the sample produced at a speed of 70 mm/min, which had a higher number of defects and surface agglomeration of HA particles, showed the highest cell viability. These findings highlight the significant impact of processing conditions on material properties, affecting susceptibility to localized forms of cell viability over time.
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