It is observed that polycrystalline chromium has a higher tensile strength than single crystalline chromium. Propose...

It is observed that polycrystalline chromium has a higher tensile strength than single crystalline chromium. Propose a reason for this difference in tensile strength

Solutions

Expert Solution

Polycrystalline means Aggregate of several crystals or grains.The boundary between the grain is the grain boundary across which the orientation of the crystal changes.A general relationship between mechanical properties and grain size is given by the Hall-Petch equation .Finer grain size means more grain boundaries or higher grain boundary area per unit volume. Deformation in metals takes place by dislocation motion and grain boundaries act as obstacles to dislocation motion. Hence, presence of more grain boundaries (finer grain size) will increase the resistance to deformation and enhance the tensile strength.but in case of single crystalline chromium dislocattionz takes place very easily because of single grain boundary

samet mamat answered 2 years ago

Next > < Previous

Related Solutions

The water quenched 1045 sample had a higher hardness and tensile strength than the air cooled...

The water quenched 1045 sample had a higher hardness and tensile strength than the air cooled sample? Explain in term of microstructural theory as to why this is the case.

It has been empirically observed that CoCo bonds with identical maturity have a higher yield than...

It has been empirically observed that CoCo bonds with identical maturity have a higher yield than straight debenture bonds of the same company. Why is this so?

In other to achieve higher levels of X-ray attenuation than observed for biological tissue,elements of higher...

In other to achieve higher levels of X-ray attenuation than observed for biological tissue,elements of higher atomic number(Z) are incorporated into the contrast agent molecule. Lithium iodide (LiI) was among the first water-soluble imaging agents. Compare mass attenuation coefficients for soft tissues and for lithium iodide

A fishing line manufacturer claims that the new X-25 series has a mean tensile strength (...

A fishing line manufacturer claims that the new X-25 series has a mean tensile strength ( ) of 25 psi and a standard deviation ( ) of 3 psi. To verify the claim, a ??sample of 25 specimens was tested and yielded the following results: 32 19 27 24 28 29 38 30 25 33 18 25 37 28 20 32 23 21 25 19 23 27 32 26 30 A. Compute the sample median, sample mode, sample mean, sample...

5. China has a higher GDP than Japan. However, Japan has a higher GDP/Capita than China....

5. China has a higher GDP than Japan. However, Japan has a higher GDP/Capita than China. Which of the two indicators represent a higher quality of life? Why?

Tensile-strength tests were carried out on two different grades of wire rod. Grade 1 has 10...

Tensile-strength tests were carried out on two different grades of wire rod. Grade 1 has 10 observations yielding a sample mean of 1085 and standard deviation of 52. Grade 2 has 15 observations yielding a sample mean of 1034 and standard deviation of 61. Assume the populations to be approximately normal with equal variances. State and conclude your hypothesis at the 0.05 level of significance if grade 1 and grade 2 true means are equal each other? Find P-Value.

What is measured by a stock’s “beta”? Suppose that stock A has a higher beta than...

What is measured by a stock’s “beta”? Suppose that stock A has a higher beta than stock B, but its rate of return has a lower standard deviation than that of stock B. According to the CAPM, which stock should be expected to offer a higher average rate of return? Explain.

what happens if the solvent that you use for crystallization has a higher boiling point than...

what happens if the solvent that you use for crystallization has a higher boiling point than the compound to be purified?

apple has a higher cost of debt than most companies in the coffee business. Which of...

apple has a higher cost of debt than most companies in the coffee business. Which of the following is true? A. The business case needs to be adjusted for the cost of capital. B. The business case is evaluated using NPV or IRR which already considers the cost of capital in the calculation or evaluation so no adjustment needed.. C. The cost of debt is not relevant to business cases. D. The cost of debt is considered a flotation cost.

1. ABC Company has produced a higher level of production in May than it produced in...

1. ABC Company has produced a higher level of production in May than it produced in April, but had the same variable costs per unit and the same total fixed costs. Which of the following is true about May’s reported costs? A. Total variable cost is less in May B. Total cost per unit is less in May C. Total cost per unit is more in May D. Total fixed costs are more in May 2. Depreciation on sewing machines...

Subjects