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Zorluk: Çok zorSingle-Sentence Inferences

Read the following sentence from an essay on early twentieth-century physical metallurgy:

"Although early twentieth-century physical metallurgists recognized that trace additions of titanium could impede grain growth in recrystallized aluminum-copper alloys, they incorrectly attributed this stabilization exclusively to grain-boundary pinning by insoluble intermetallic precipitates rather than to solute drag exerted by unprecipitated titanium atoms during high-temperature annealing."

Which of the following can be most reasonably inferred from the sentence regarding the behavior of aluminum-copper alloys containing trace additions of titanium?

  1. Grain growth in recrystallized aluminum-copper alloys can be inhibited by mechanisms other than grain-boundary pinning caused by insoluble intermetallic precipitates.Cevap
  2. B
    Early twentieth-century metallurgists failed to observe that adding trace amounts of titanium stabilized the grain structure of aluminum-copper alloys.
  3. C
    Insoluble intermetallic precipitates formed by titanium additions do not actually occur during the annealing of aluminum-copper alloys.
  4. D
    Solute drag caused by unprecipitated titanium atoms is an ineffective mechanism for controlling grain size during low-temperature metallurgical processes.
  5. E
    Early twentieth-century metallurgists correctly identified solute drag as a contributing factor to grain-boundary pinning in aluminum-copper alloys.

Cevap

Grain growth in recrystallized aluminum-copper alloys can be inhibited by mechanisms other than grain-boundary pinning caused by insoluble intermetallic precipitates.
The correct answer is supported by the author's statement that metallurgists 'incorrectly attributed this stabilization exclusively to grain-boundary pinning... rather than to solute drag.' This directly implies that solute drag—a mechanism distinct from precipitate pinning—also contributes to impeding grain growth, meaning that grain growth can indeed be inhibited by mechanisms other than precipitate pinning.

Adım Adım Çözüm

1
Analyze the factual assertions in the target sentence.
The sentence establishes that trace titanium additions do impede grain growth (stabilization) and that metallurgists recognized this effect.
Understanding the baseline facts stated in the sentence is required before evaluating logical deductions.
2
Analyze the author's critique of the metallurgists' attribution.
The author notes that metallurgists erred by attributing stabilization *exclusively* to grain-boundary pinning by insoluble precipitates instead of recognizing solute drag by unprecipitated titanium atoms.
Identifying the contrast between the incorrect attribution (exclusive precipitate pinning) and the overlooked factor (solute drag) clarifies what actually causes the stabilization.
3
Derive the strict single-sentence inference.
Because solute drag by unprecipitated titanium atoms contributes to impeding grain growth, grain growth inhibition is not limited solely to precipitate pinning.
This deduction directly supports the conclusion that mechanisms other than precipitate pinning operate to inhibit grain growth in these alloys.

Anahtar Kavram

Single-Sentence Logical Inference
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Konular

Single-Sentence Inferences

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