Material Analysis
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Impact strength of toughened alloys varies greatly with temperature
Problem Phenomenon
Toughness is good at room temperature but embrittles rapidly at low temperatures
Cause Analysis
The Tg of the toughening phase (rubber) is higher than the test temperature and loses elasticity; the matrix embrittles at low temperature; interface bonding force decreases at low temperature
Solution
Select toughening rubbers with lower Tg (such as EPDM, POE); increase the toughening phase dosage; optimize interface compatibilization
Key Takeaway
The temperature resistance range of toughened alloys is strictly limited by the Tg of the toughening phase
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