M Manisha Agrawal 🎓 Tutor III ⭐ 9.34K Points 📊 Engineering Materials Q. Age-hardening is related with (A) stainless steel (B) gun metal (C) german silver (D) duralumin 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (D) duralumin